3573 lines
117 KiB
Go
3573 lines
117 KiB
Go
// Copyright 2015 PingCAP, Inc.
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//
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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// Copyright 2013 The ql Authors. All rights reserved.
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// Use of this source code is governed by a BSD-style
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// license that can be found in the LICENSES/QL-LICENSE file.
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package session
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import (
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"bytes"
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"context"
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"crypto/tls"
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"encoding/hex"
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"encoding/json"
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stderrs "errors"
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"flag"
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"fmt"
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"math/rand"
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"runtime/pprof"
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"runtime/trace"
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"strconv"
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"strings"
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"sync"
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"sync/atomic"
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"time"
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"github.com/ngaut/pools"
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"github.com/opentracing/opentracing-go"
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"github.com/pingcap/errors"
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"github.com/pingcap/failpoint"
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"github.com/pingcap/kvproto/pkg/kvrpcpb"
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"github.com/pingcap/tidb/bindinfo"
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"github.com/pingcap/tidb/config"
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"github.com/pingcap/tidb/ddl"
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"github.com/pingcap/tidb/ddl/placement"
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"github.com/pingcap/tidb/domain"
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"github.com/pingcap/tidb/errno"
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"github.com/pingcap/tidb/executor"
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"github.com/pingcap/tidb/expression"
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"github.com/pingcap/tidb/infoschema"
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"github.com/pingcap/tidb/kv"
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"github.com/pingcap/tidb/meta"
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"github.com/pingcap/tidb/metrics"
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"github.com/pingcap/tidb/owner"
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"github.com/pingcap/tidb/parser"
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"github.com/pingcap/tidb/parser/ast"
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"github.com/pingcap/tidb/parser/auth"
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"github.com/pingcap/tidb/parser/charset"
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"github.com/pingcap/tidb/parser/model"
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"github.com/pingcap/tidb/parser/mysql"
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"github.com/pingcap/tidb/parser/terror"
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"github.com/pingcap/tidb/planner"
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plannercore "github.com/pingcap/tidb/planner/core"
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"github.com/pingcap/tidb/plugin"
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"github.com/pingcap/tidb/privilege"
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"github.com/pingcap/tidb/privilege/privileges"
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"github.com/pingcap/tidb/session/txninfo"
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"github.com/pingcap/tidb/sessionctx"
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"github.com/pingcap/tidb/sessionctx/binloginfo"
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"github.com/pingcap/tidb/sessionctx/sessionstates"
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"github.com/pingcap/tidb/sessionctx/stmtctx"
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"github.com/pingcap/tidb/sessionctx/variable"
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"github.com/pingcap/tidb/sessiontxn"
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"github.com/pingcap/tidb/sessiontxn/staleread"
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"github.com/pingcap/tidb/statistics"
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"github.com/pingcap/tidb/statistics/handle"
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storeerr "github.com/pingcap/tidb/store/driver/error"
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"github.com/pingcap/tidb/store/driver/txn"
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"github.com/pingcap/tidb/store/helper"
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"github.com/pingcap/tidb/table"
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"github.com/pingcap/tidb/table/temptable"
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"github.com/pingcap/tidb/tablecodec"
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"github.com/pingcap/tidb/telemetry"
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"github.com/pingcap/tidb/util"
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"github.com/pingcap/tidb/util/chunk"
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"github.com/pingcap/tidb/util/collate"
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"github.com/pingcap/tidb/util/dbterror"
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"github.com/pingcap/tidb/util/execdetails"
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"github.com/pingcap/tidb/util/kvcache"
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"github.com/pingcap/tidb/util/logutil"
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"github.com/pingcap/tidb/util/logutil/consistency"
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"github.com/pingcap/tidb/util/sem"
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"github.com/pingcap/tidb/util/sli"
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"github.com/pingcap/tidb/util/sqlexec"
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"github.com/pingcap/tidb/util/tableutil"
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"github.com/pingcap/tidb/util/timeutil"
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"github.com/pingcap/tidb/util/topsql"
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topsqlstate "github.com/pingcap/tidb/util/topsql/state"
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"github.com/pingcap/tidb/util/topsql/stmtstats"
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"github.com/pingcap/tipb/go-binlog"
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tikverr "github.com/tikv/client-go/v2/error"
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tikvstore "github.com/tikv/client-go/v2/kv"
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"github.com/tikv/client-go/v2/oracle"
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tikvutil "github.com/tikv/client-go/v2/util"
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"go.uber.org/zap"
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)
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var (
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statementPerTransactionPessimisticOK = metrics.StatementPerTransaction.WithLabelValues(metrics.LblPessimistic, metrics.LblOK)
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statementPerTransactionPessimisticError = metrics.StatementPerTransaction.WithLabelValues(metrics.LblPessimistic, metrics.LblError)
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statementPerTransactionOptimisticOK = metrics.StatementPerTransaction.WithLabelValues(metrics.LblOptimistic, metrics.LblOK)
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statementPerTransactionOptimisticError = metrics.StatementPerTransaction.WithLabelValues(metrics.LblOptimistic, metrics.LblError)
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transactionDurationPessimisticCommit = metrics.TransactionDuration.WithLabelValues(metrics.LblPessimistic, metrics.LblCommit)
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transactionDurationPessimisticAbort = metrics.TransactionDuration.WithLabelValues(metrics.LblPessimistic, metrics.LblAbort)
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transactionDurationOptimisticCommit = metrics.TransactionDuration.WithLabelValues(metrics.LblOptimistic, metrics.LblCommit)
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transactionDurationOptimisticAbort = metrics.TransactionDuration.WithLabelValues(metrics.LblOptimistic, metrics.LblAbort)
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sessionExecuteCompileDurationInternal = metrics.SessionExecuteCompileDuration.WithLabelValues(metrics.LblInternal)
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sessionExecuteCompileDurationGeneral = metrics.SessionExecuteCompileDuration.WithLabelValues(metrics.LblGeneral)
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sessionExecuteParseDurationInternal = metrics.SessionExecuteParseDuration.WithLabelValues(metrics.LblInternal)
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sessionExecuteParseDurationGeneral = metrics.SessionExecuteParseDuration.WithLabelValues(metrics.LblGeneral)
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telemetryCTEUsageRecurCTE = metrics.TelemetrySQLCTECnt.WithLabelValues("recurCTE")
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telemetryCTEUsageNonRecurCTE = metrics.TelemetrySQLCTECnt.WithLabelValues("nonRecurCTE")
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telemetryCTEUsageNotCTE = metrics.TelemetrySQLCTECnt.WithLabelValues("notCTE")
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telemetryMultiSchemaChangeUsage = metrics.TelemetryMultiSchemaChangeCnt
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telemetryTablePartitionUsage = metrics.TelemetryTablePartitionCnt
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telemetryTablePartitionListUsage = metrics.TelemetryTablePartitionListCnt
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telemetryTablePartitionRangeUsage = metrics.TelemetryTablePartitionRangeCnt
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telemetryTablePartitionHashUsage = metrics.TelemetryTablePartitionHashCnt
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telemetryTablePartitionRangeColumnsUsage = metrics.TelemetryTablePartitionRangeColumnsCnt
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telemetryTablePartitionListColumnsUsage = metrics.TelemetryTablePartitionListColumnsCnt
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telemetryTablePartitionMaxPartitionsUsage = metrics.TelemetryTablePartitionMaxPartitionsCnt
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)
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// Session context, it is consistent with the lifecycle of a client connection.
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type Session interface {
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sessionctx.Context
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Status() uint16 // Flag of current status, such as autocommit.
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LastInsertID() uint64 // LastInsertID is the last inserted auto_increment ID.
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LastMessage() string // LastMessage is the info message that may be generated by last command
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AffectedRows() uint64 // Affected rows by latest executed stmt.
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// Execute is deprecated, and only used by plugins. Use ExecuteStmt() instead.
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Execute(context.Context, string) ([]sqlexec.RecordSet, error) // Execute a sql statement.
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// ExecuteStmt executes a parsed statement.
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ExecuteStmt(context.Context, ast.StmtNode) (sqlexec.RecordSet, error)
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// Parse is deprecated, use ParseWithParams() instead.
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Parse(ctx context.Context, sql string) ([]ast.StmtNode, error)
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// Parameterize tries to convert the general statement to an execute statement and then uses general plan cache to handle it.
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// e.g. "select * from t where a>23" --> "execute 'select * from t where a>?' using 23".
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// By using the general plan cache, it can skip the parse and optimization stage so to gain some performance benefits.
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Parameterize(ctx context.Context, originSQL string) (*ast.ExecuteStmt, bool)
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// ExecuteInternal is a helper around ParseWithParams() and ExecuteStmt(). It is not allowed to execute multiple statements.
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ExecuteInternal(context.Context, string, ...interface{}) (sqlexec.RecordSet, error)
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String() string // String is used to debug.
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CommitTxn(context.Context) error
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RollbackTxn(context.Context)
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// PrepareStmt executes prepare statement in binary protocol.
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PrepareStmt(sql string) (stmtID uint32, paramCount int, fields []*ast.ResultField, err error)
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// CacheGeneralStmt parses the sql, generates the corresponding PlanCacheStmt and cache it.
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CacheGeneralStmt(sql string) (interface{}, error)
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// ExecutePreparedStmt executes a prepared statement.
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ExecutePreparedStmt(ctx context.Context, stmtID uint32, param []expression.Expression) (sqlexec.RecordSet, error)
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// ExecuteGeneralStmt executes a general statement.
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ExecuteGeneralStmt(ctx context.Context, sql string, param []expression.Expression) (sqlexec.RecordSet, error)
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DropPreparedStmt(stmtID uint32) error
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// SetSessionStatesHandler sets SessionStatesHandler for type stateType.
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SetSessionStatesHandler(stateType sessionstates.SessionStateType, handler sessionctx.SessionStatesHandler)
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SetClientCapability(uint32) // Set client capability flags.
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SetConnectionID(uint64)
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SetCommandValue(byte)
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SetProcessInfo(string, time.Time, byte, uint64)
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SetTLSState(*tls.ConnectionState)
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SetCollation(coID int) error
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SetSessionManager(util.SessionManager)
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Close()
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Auth(user *auth.UserIdentity, auth []byte, salt []byte) error
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AuthWithoutVerification(user *auth.UserIdentity) bool
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AuthPluginForUser(user *auth.UserIdentity) (string, error)
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MatchIdentity(username, remoteHost string) (*auth.UserIdentity, error)
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// Return the information of the txn current running
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TxnInfo() *txninfo.TxnInfo
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// PrepareTxnCtx is exported for test.
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PrepareTxnCtx(context.Context) error
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// FieldList returns fields list of a table.
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FieldList(tableName string) (fields []*ast.ResultField, err error)
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SetPort(port string)
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// set cur session operations allowed when tikv disk full happens.
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SetDiskFullOpt(level kvrpcpb.DiskFullOpt)
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GetDiskFullOpt() kvrpcpb.DiskFullOpt
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ClearDiskFullOpt()
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}
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var _ Session = (*session)(nil)
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type stmtRecord struct {
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st sqlexec.Statement
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stmtCtx *stmtctx.StatementContext
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}
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// StmtHistory holds all histories of statements in a txn.
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type StmtHistory struct {
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history []*stmtRecord
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}
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// Add appends a stmt to history list.
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func (h *StmtHistory) Add(st sqlexec.Statement, stmtCtx *stmtctx.StatementContext) {
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s := &stmtRecord{
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st: st,
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stmtCtx: stmtCtx,
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}
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h.history = append(h.history, s)
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}
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// Count returns the count of the history.
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func (h *StmtHistory) Count() int {
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return len(h.history)
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}
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type session struct {
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// processInfo is used by ShowProcess(), and should be modified atomically.
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processInfo atomic.Value
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txn LazyTxn
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mu struct {
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sync.RWMutex
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values map[fmt.Stringer]interface{}
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}
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currentCtx context.Context // only use for runtime.trace, Please NEVER use it.
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currentPlan plannercore.Plan
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store kv.Storage
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preparedPlanCache *kvcache.SimpleLRUCache
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generalPlanCache *kvcache.SimpleLRUCache
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sessionVars *variable.SessionVars
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sessionManager util.SessionManager
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statsCollector *handle.SessionStatsCollector
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// ddlOwnerManager is used in `select tidb_is_ddl_owner()` statement;
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ddlOwnerManager owner.Manager
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// lockedTables use to record the table locks hold by the session.
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lockedTables map[int64]model.TableLockTpInfo
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// client shared coprocessor client per session
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client kv.Client
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mppClient kv.MPPClient
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// indexUsageCollector collects index usage information.
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idxUsageCollector *handle.SessionIndexUsageCollector
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functionUsageMu struct {
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sync.RWMutex
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builtinFunctionUsage telemetry.BuiltinFunctionsUsage
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}
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// allowed when tikv disk full happened.
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diskFullOpt kvrpcpb.DiskFullOpt
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// StmtStats is used to count various indicators of each SQL in this session
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// at each point in time. These data will be periodically taken away by the
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// background goroutine. The background goroutine will continue to aggregate
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// all the local data in each session, and finally report them to the remote
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// regularly.
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stmtStats *stmtstats.StatementStats
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// Used to encode and decode each type of session states.
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sessionStatesHandlers map[sessionstates.SessionStateType]sessionctx.SessionStatesHandler
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// Contains a list of sessions used to collect advisory locks.
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advisoryLocks map[string]*advisoryLock
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}
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var parserPool = &sync.Pool{New: func() interface{} { return parser.New() }}
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// AddTableLock adds table lock to the session lock map.
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func (s *session) AddTableLock(locks []model.TableLockTpInfo) {
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for _, l := range locks {
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// read only lock is session unrelated, skip it when adding lock to session.
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if l.Tp != model.TableLockReadOnly {
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s.lockedTables[l.TableID] = l
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}
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}
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}
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// ReleaseTableLocks releases table lock in the session lock map.
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func (s *session) ReleaseTableLocks(locks []model.TableLockTpInfo) {
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for _, l := range locks {
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delete(s.lockedTables, l.TableID)
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}
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}
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// ReleaseTableLockByTableIDs releases table lock in the session lock map by table ID.
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func (s *session) ReleaseTableLockByTableIDs(tableIDs []int64) {
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for _, tblID := range tableIDs {
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delete(s.lockedTables, tblID)
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}
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}
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// CheckTableLocked checks the table lock.
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func (s *session) CheckTableLocked(tblID int64) (bool, model.TableLockType) {
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lt, ok := s.lockedTables[tblID]
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if !ok {
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return false, model.TableLockNone
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}
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return true, lt.Tp
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}
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// GetAllTableLocks gets all table locks table id and db id hold by the session.
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func (s *session) GetAllTableLocks() []model.TableLockTpInfo {
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lockTpInfo := make([]model.TableLockTpInfo, 0, len(s.lockedTables))
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for _, tl := range s.lockedTables {
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lockTpInfo = append(lockTpInfo, tl)
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}
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return lockTpInfo
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}
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// HasLockedTables uses to check whether this session locked any tables.
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// If so, the session can only visit the table which locked by self.
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func (s *session) HasLockedTables() bool {
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b := len(s.lockedTables) > 0
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return b
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}
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// ReleaseAllTableLocks releases all table locks hold by the session.
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func (s *session) ReleaseAllTableLocks() {
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s.lockedTables = make(map[int64]model.TableLockTpInfo)
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}
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// IsDDLOwner checks whether this session is DDL owner.
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func (s *session) IsDDLOwner() bool {
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return s.ddlOwnerManager.IsOwner()
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}
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func (s *session) cleanRetryInfo() {
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if s.sessionVars.RetryInfo.Retrying {
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return
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}
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retryInfo := s.sessionVars.RetryInfo
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defer retryInfo.Clean()
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if len(retryInfo.DroppedPreparedStmtIDs) == 0 {
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return
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}
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planCacheEnabled := s.GetSessionVars().EnablePreparedPlanCache
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var cacheKey kvcache.Key
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var err error
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var preparedAst *ast.Prepared
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var stmtText, stmtDB string
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if planCacheEnabled {
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firstStmtID := retryInfo.DroppedPreparedStmtIDs[0]
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if preparedPointer, ok := s.sessionVars.PreparedStmts[firstStmtID]; ok {
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preparedObj, ok := preparedPointer.(*plannercore.PlanCacheStmt)
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if ok {
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preparedAst = preparedObj.PreparedAst
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stmtText, stmtDB = preparedObj.StmtText, preparedObj.StmtDB
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bindSQL, _ := plannercore.GetBindSQL4PlanCache(s, preparedObj)
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cacheKey, err = plannercore.NewPlanCacheKey(s.sessionVars, stmtText, stmtDB, preparedAst.SchemaVersion,
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0, bindSQL)
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if err != nil {
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logutil.Logger(s.currentCtx).Warn("clean cached plan failed", zap.Error(err))
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return
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}
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}
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}
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}
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for i, stmtID := range retryInfo.DroppedPreparedStmtIDs {
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if planCacheEnabled {
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if i > 0 && preparedAst != nil {
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plannercore.SetPstmtIDSchemaVersion(cacheKey, stmtText, preparedAst.SchemaVersion, s.sessionVars.IsolationReadEngines)
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}
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if !s.sessionVars.IgnorePreparedCacheCloseStmt { // keep the plan in cache
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s.GetPlanCache(false).Delete(cacheKey)
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}
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}
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s.sessionVars.RemovePreparedStmt(stmtID)
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}
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}
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func (s *session) Status() uint16 {
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return s.sessionVars.Status
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}
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func (s *session) LastInsertID() uint64 {
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if s.sessionVars.StmtCtx.LastInsertID > 0 {
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return s.sessionVars.StmtCtx.LastInsertID
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}
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return s.sessionVars.StmtCtx.InsertID
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}
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func (s *session) LastMessage() string {
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return s.sessionVars.StmtCtx.GetMessage()
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}
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func (s *session) AffectedRows() uint64 {
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return s.sessionVars.StmtCtx.AffectedRows()
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}
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func (s *session) SetClientCapability(capability uint32) {
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s.sessionVars.ClientCapability = capability
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}
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func (s *session) SetConnectionID(connectionID uint64) {
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s.sessionVars.ConnectionID = connectionID
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}
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func (s *session) SetTLSState(tlsState *tls.ConnectionState) {
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// If user is not connected via TLS, then tlsState == nil.
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if tlsState != nil {
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s.sessionVars.TLSConnectionState = tlsState
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}
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}
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func (s *session) SetCommandValue(command byte) {
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atomic.StoreUint32(&s.sessionVars.CommandValue, uint32(command))
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}
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func (s *session) SetCollation(coID int) error {
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cs, co, err := charset.GetCharsetInfoByID(coID)
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if err != nil {
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return err
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}
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// If new collations are enabled, switch to the default
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// collation if this one is not supported.
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co = collate.SubstituteMissingCollationToDefault(co)
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for _, v := range variable.SetNamesVariables {
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terror.Log(s.sessionVars.SetSystemVarWithoutValidation(v, cs))
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}
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return s.sessionVars.SetSystemVarWithoutValidation(variable.CollationConnection, co)
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}
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func (s *session) GetPlanCache(isGeneralPlanCache bool) *kvcache.SimpleLRUCache {
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if isGeneralPlanCache { // use the general plan cache
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if !s.GetSessionVars().EnableGeneralPlanCache {
|
|
return nil
|
|
}
|
|
if s.generalPlanCache == nil { // lazy construction
|
|
s.generalPlanCache = kvcache.NewSimpleLRUCache(uint(s.GetSessionVars().GeneralPlanCacheSize),
|
|
variable.PreparedPlanCacheMemoryGuardRatio.Load(), plannercore.PreparedPlanCacheMaxMemory.Load())
|
|
}
|
|
return s.generalPlanCache
|
|
}
|
|
|
|
// use the prepared plan cache
|
|
if !s.GetSessionVars().EnablePreparedPlanCache {
|
|
return nil
|
|
}
|
|
if s.preparedPlanCache == nil { // lazy construction
|
|
s.preparedPlanCache = kvcache.NewSimpleLRUCache(uint(s.GetSessionVars().PreparedPlanCacheSize),
|
|
variable.PreparedPlanCacheMemoryGuardRatio.Load(), plannercore.PreparedPlanCacheMaxMemory.Load())
|
|
}
|
|
return s.preparedPlanCache
|
|
}
|
|
|
|
func (s *session) SetSessionManager(sm util.SessionManager) {
|
|
s.sessionManager = sm
|
|
}
|
|
|
|
func (s *session) GetSessionManager() util.SessionManager {
|
|
return s.sessionManager
|
|
}
|
|
|
|
func (s *session) StoreQueryFeedback(feedback interface{}) {
|
|
if fb, ok := feedback.(*statistics.QueryFeedback); !ok || fb == nil || !fb.Valid {
|
|
return
|
|
}
|
|
if s.statsCollector != nil {
|
|
do, err := GetDomain(s.store)
|
|
if err != nil {
|
|
logutil.BgLogger().Debug("domain not found", zap.Error(err))
|
|
metrics.StoreQueryFeedbackCounter.WithLabelValues(metrics.LblError).Inc()
|
|
return
|
|
}
|
|
err = s.statsCollector.StoreQueryFeedback(feedback, do.StatsHandle())
|
|
if err != nil {
|
|
logutil.BgLogger().Debug("store query feedback", zap.Error(err))
|
|
metrics.StoreQueryFeedbackCounter.WithLabelValues(metrics.LblError).Inc()
|
|
return
|
|
}
|
|
metrics.StoreQueryFeedbackCounter.WithLabelValues(metrics.LblOK).Inc()
|
|
}
|
|
}
|
|
|
|
func (s *session) UpdateColStatsUsage(predicateColumns []model.TableItemID) {
|
|
if s.statsCollector == nil {
|
|
return
|
|
}
|
|
t := time.Now()
|
|
colMap := make(map[model.TableItemID]time.Time, len(predicateColumns))
|
|
for _, col := range predicateColumns {
|
|
if col.IsIndex {
|
|
continue
|
|
}
|
|
colMap[col] = t
|
|
}
|
|
s.statsCollector.UpdateColStatsUsage(colMap)
|
|
}
|
|
|
|
// StoreIndexUsage stores index usage information in idxUsageCollector.
|
|
func (s *session) StoreIndexUsage(tblID int64, idxID int64, rowsSelected int64) {
|
|
if s.idxUsageCollector == nil {
|
|
return
|
|
}
|
|
s.idxUsageCollector.Update(tblID, idxID, &handle.IndexUsageInformation{QueryCount: 1, RowsSelected: rowsSelected})
|
|
}
|
|
|
|
// FieldList returns fields list of a table.
|
|
func (s *session) FieldList(tableName string) ([]*ast.ResultField, error) {
|
|
is := s.GetInfoSchema().(infoschema.InfoSchema)
|
|
dbName := model.NewCIStr(s.GetSessionVars().CurrentDB)
|
|
tName := model.NewCIStr(tableName)
|
|
pm := privilege.GetPrivilegeManager(s)
|
|
if pm != nil && s.sessionVars.User != nil {
|
|
if !pm.RequestVerification(s.sessionVars.ActiveRoles, dbName.O, tName.O, "", mysql.AllPrivMask) {
|
|
user := s.sessionVars.User
|
|
u := user.Username
|
|
h := user.Hostname
|
|
if len(user.AuthUsername) > 0 && len(user.AuthHostname) > 0 {
|
|
u = user.AuthUsername
|
|
h = user.AuthHostname
|
|
}
|
|
return nil, plannercore.ErrTableaccessDenied.GenWithStackByArgs("SELECT", u, h, tableName)
|
|
}
|
|
}
|
|
table, err := is.TableByName(dbName, tName)
|
|
if err != nil {
|
|
return nil, err
|
|
}
|
|
|
|
cols := table.Cols()
|
|
fields := make([]*ast.ResultField, 0, len(cols))
|
|
for _, col := range table.Cols() {
|
|
rf := &ast.ResultField{
|
|
ColumnAsName: col.Name,
|
|
TableAsName: tName,
|
|
DBName: dbName,
|
|
Table: table.Meta(),
|
|
Column: col.ColumnInfo,
|
|
}
|
|
fields = append(fields, rf)
|
|
}
|
|
return fields, nil
|
|
}
|
|
|
|
func (s *session) TxnInfo() *txninfo.TxnInfo {
|
|
s.txn.mu.RLock()
|
|
// Copy on read to get a snapshot, this API shouldn't be frequently called.
|
|
txnInfo := s.txn.mu.TxnInfo
|
|
s.txn.mu.RUnlock()
|
|
|
|
if txnInfo.StartTS == 0 {
|
|
return nil
|
|
}
|
|
|
|
processInfo := s.ShowProcess()
|
|
txnInfo.ConnectionID = processInfo.ID
|
|
txnInfo.Username = processInfo.User
|
|
txnInfo.CurrentDB = processInfo.DB
|
|
|
|
return &txnInfo
|
|
}
|
|
|
|
func (s *session) doCommit(ctx context.Context) error {
|
|
if !s.txn.Valid() {
|
|
return nil
|
|
}
|
|
|
|
// to avoid session set overlap the txn set.
|
|
if s.GetDiskFullOpt() != kvrpcpb.DiskFullOpt_NotAllowedOnFull {
|
|
s.txn.SetDiskFullOpt(s.GetDiskFullOpt())
|
|
}
|
|
|
|
defer func() {
|
|
s.txn.changeToInvalid()
|
|
s.sessionVars.SetInTxn(false)
|
|
s.ClearDiskFullOpt()
|
|
}()
|
|
// check if the transaction is read-only
|
|
if s.txn.IsReadOnly() {
|
|
return nil
|
|
}
|
|
// check if the cluster is read-only
|
|
if !s.sessionVars.InRestrictedSQL && variable.RestrictedReadOnly.Load() || variable.VarTiDBSuperReadOnly.Load() {
|
|
// It is not internal SQL, and the cluster has one of RestrictedReadOnly or SuperReadOnly
|
|
// We need to privilege check again: a privilege check occurred during planning, but we need
|
|
// to prevent the case that a long running auto-commit statement is now trying to commit.
|
|
pm := privilege.GetPrivilegeManager(s)
|
|
roles := s.sessionVars.ActiveRoles
|
|
if pm != nil && !pm.HasExplicitlyGrantedDynamicPrivilege(roles, "RESTRICTED_REPLICA_WRITER_ADMIN", false) {
|
|
s.RollbackTxn(ctx)
|
|
return plannercore.ErrSQLInReadOnlyMode
|
|
}
|
|
}
|
|
err := s.checkPlacementPolicyBeforeCommit()
|
|
if err != nil {
|
|
return err
|
|
}
|
|
// mockCommitError and mockGetTSErrorInRetry use to test PR #8743.
|
|
failpoint.Inject("mockCommitError", func(val failpoint.Value) {
|
|
if val.(bool) {
|
|
if _, err := failpoint.Eval("tikvclient/mockCommitErrorOpt"); err == nil {
|
|
failpoint.Return(kv.ErrTxnRetryable)
|
|
}
|
|
}
|
|
})
|
|
|
|
if s.sessionVars.BinlogClient != nil {
|
|
prewriteValue := binloginfo.GetPrewriteValue(s, false)
|
|
if prewriteValue != nil {
|
|
prewriteData, err := prewriteValue.Marshal()
|
|
if err != nil {
|
|
return errors.Trace(err)
|
|
}
|
|
info := &binloginfo.BinlogInfo{
|
|
Data: &binlog.Binlog{
|
|
Tp: binlog.BinlogType_Prewrite,
|
|
PrewriteValue: prewriteData,
|
|
},
|
|
Client: s.sessionVars.BinlogClient,
|
|
}
|
|
s.txn.SetOption(kv.BinlogInfo, info)
|
|
}
|
|
}
|
|
|
|
sessVars := s.GetSessionVars()
|
|
// Get the related table or partition IDs.
|
|
relatedPhysicalTables := sessVars.TxnCtx.TableDeltaMap
|
|
// Get accessed temporary tables in the transaction.
|
|
temporaryTables := sessVars.TxnCtx.TemporaryTables
|
|
physicalTableIDs := make([]int64, 0, len(relatedPhysicalTables))
|
|
for id := range relatedPhysicalTables {
|
|
// Schema change on global temporary tables doesn't affect transactions.
|
|
if _, ok := temporaryTables[id]; ok {
|
|
continue
|
|
}
|
|
physicalTableIDs = append(physicalTableIDs, id)
|
|
}
|
|
// Set this option for 2 phase commit to validate schema lease.
|
|
s.txn.SetOption(kv.SchemaChecker, domain.NewSchemaChecker(domain.GetDomain(s), s.GetInfoSchema().SchemaMetaVersion(), physicalTableIDs))
|
|
s.txn.SetOption(kv.InfoSchema, s.sessionVars.TxnCtx.InfoSchema)
|
|
s.txn.SetOption(kv.CommitHook, func(info string, _ error) { s.sessionVars.LastTxnInfo = info })
|
|
if sessVars.EnableAmendPessimisticTxn {
|
|
s.txn.SetOption(kv.SchemaAmender, NewSchemaAmenderForTikvTxn(s))
|
|
}
|
|
s.txn.SetOption(kv.EnableAsyncCommit, sessVars.EnableAsyncCommit)
|
|
s.txn.SetOption(kv.Enable1PC, sessVars.Enable1PC)
|
|
s.txn.SetOption(kv.ResourceGroupTagger, sessVars.StmtCtx.GetResourceGroupTagger())
|
|
if sessVars.StmtCtx.KvExecCounter != nil {
|
|
// Bind an interceptor for client-go to count the number of SQL executions of each TiKV.
|
|
s.txn.SetOption(kv.RPCInterceptor, sessVars.StmtCtx.KvExecCounter.RPCInterceptor())
|
|
}
|
|
// priority of the sysvar is lower than `start transaction with causal consistency only`
|
|
if val := s.txn.GetOption(kv.GuaranteeLinearizability); val == nil || val.(bool) {
|
|
// We needn't ask the TiKV client to guarantee linearizability for auto-commit transactions
|
|
// because the property is naturally holds:
|
|
// We guarantee the commitTS of any transaction must not exceed the next timestamp from the TSO.
|
|
// An auto-commit transaction fetches its startTS from the TSO so its commitTS > its startTS > the commitTS
|
|
// of any previously committed transactions.
|
|
s.txn.SetOption(kv.GuaranteeLinearizability,
|
|
sessVars.TxnCtx.IsExplicit && sessVars.GuaranteeLinearizability)
|
|
}
|
|
if tables := sessVars.TxnCtx.TemporaryTables; len(tables) > 0 {
|
|
s.txn.SetOption(kv.KVFilter, temporaryTableKVFilter(tables))
|
|
}
|
|
if tables := sessVars.TxnCtx.CachedTables; len(tables) > 0 {
|
|
c := cachedTableRenewLease{tables: tables}
|
|
now := time.Now()
|
|
err := c.start(ctx)
|
|
defer c.stop(ctx)
|
|
sessVars.StmtCtx.WaitLockLeaseTime += time.Since(now)
|
|
if err != nil {
|
|
return errors.Trace(err)
|
|
}
|
|
s.txn.SetOption(kv.CommitTSUpperBoundCheck, c.commitTSCheck)
|
|
}
|
|
|
|
err = s.commitTxnWithTemporaryData(tikvutil.SetSessionID(ctx, sessVars.ConnectionID), &s.txn)
|
|
if err != nil {
|
|
err = s.handleAssertionFailure(ctx, err)
|
|
}
|
|
return err
|
|
}
|
|
|
|
type cachedTableRenewLease struct {
|
|
tables map[int64]interface{}
|
|
lease []uint64 // Lease for each visited cached tables.
|
|
exit chan struct{}
|
|
}
|
|
|
|
func (c *cachedTableRenewLease) start(ctx context.Context) error {
|
|
c.exit = make(chan struct{})
|
|
c.lease = make([]uint64, len(c.tables))
|
|
wg := make(chan error, len(c.tables))
|
|
ith := 0
|
|
for _, raw := range c.tables {
|
|
tbl := raw.(table.CachedTable)
|
|
go tbl.WriteLockAndKeepAlive(ctx, c.exit, &c.lease[ith], wg)
|
|
ith++
|
|
}
|
|
|
|
// Wait for all LockForWrite() return, this function can return.
|
|
var err error
|
|
for ; ith > 0; ith-- {
|
|
tmp := <-wg
|
|
if tmp != nil {
|
|
err = tmp
|
|
}
|
|
}
|
|
return err
|
|
}
|
|
|
|
func (c *cachedTableRenewLease) stop(ctx context.Context) {
|
|
close(c.exit)
|
|
}
|
|
|
|
func (c *cachedTableRenewLease) commitTSCheck(commitTS uint64) bool {
|
|
for i := 0; i < len(c.lease); i++ {
|
|
lease := atomic.LoadUint64(&c.lease[i])
|
|
if commitTS >= lease {
|
|
// Txn fails to commit because the write lease is expired.
|
|
return false
|
|
}
|
|
}
|
|
return true
|
|
}
|
|
|
|
// handleAssertionFailure extracts the possible underlying assertionFailed error,
|
|
// gets the corresponding MVCC history and logs it.
|
|
// If it's not an assertion failure, returns the original error.
|
|
func (s *session) handleAssertionFailure(ctx context.Context, err error) error {
|
|
var assertionFailure *tikverr.ErrAssertionFailed
|
|
if !stderrs.As(err, &assertionFailure) {
|
|
return err
|
|
}
|
|
key := assertionFailure.Key
|
|
newErr := kv.ErrAssertionFailed.GenWithStackByArgs(
|
|
hex.EncodeToString(key), assertionFailure.Assertion.String(), assertionFailure.StartTs,
|
|
assertionFailure.ExistingStartTs, assertionFailure.ExistingCommitTs,
|
|
)
|
|
|
|
if s.GetSessionVars().EnableRedactLog {
|
|
return newErr
|
|
}
|
|
|
|
var decodeFunc func(kv.Key, *kvrpcpb.MvccGetByKeyResponse, map[string]interface{})
|
|
// if it's a record key or an index key, decode it
|
|
if infoSchema, ok := s.sessionVars.TxnCtx.InfoSchema.(infoschema.InfoSchema); ok &&
|
|
infoSchema != nil && (tablecodec.IsRecordKey(key) || tablecodec.IsIndexKey(key)) {
|
|
tableID := tablecodec.DecodeTableID(key)
|
|
if table, ok := infoSchema.TableByID(tableID); ok {
|
|
if tablecodec.IsRecordKey(key) {
|
|
decodeFunc = consistency.DecodeRowMvccData(table.Meta())
|
|
} else {
|
|
tableInfo := table.Meta()
|
|
_, indexID, _, e := tablecodec.DecodeIndexKey(key)
|
|
if e != nil {
|
|
logutil.Logger(ctx).Error("assertion failed but cannot decode index key", zap.Error(e))
|
|
return err
|
|
}
|
|
var indexInfo *model.IndexInfo
|
|
for _, idx := range tableInfo.Indices {
|
|
if idx.ID == indexID {
|
|
indexInfo = idx
|
|
break
|
|
}
|
|
}
|
|
if indexInfo == nil {
|
|
return err
|
|
}
|
|
decodeFunc = consistency.DecodeIndexMvccData(indexInfo)
|
|
}
|
|
} else {
|
|
logutil.Logger(ctx).Warn("assertion failed but table not found in infoschema", zap.Int64("tableID", tableID))
|
|
}
|
|
}
|
|
if store, ok := s.store.(helper.Storage); ok {
|
|
content := consistency.GetMvccByKey(store, key, decodeFunc)
|
|
logutil.Logger(ctx).Error("assertion failed", zap.String("message", newErr.Error()), zap.String("mvcc history", content))
|
|
}
|
|
return newErr
|
|
}
|
|
|
|
func (s *session) commitTxnWithTemporaryData(ctx context.Context, txn kv.Transaction) error {
|
|
sessVars := s.sessionVars
|
|
txnTempTables := sessVars.TxnCtx.TemporaryTables
|
|
if len(txnTempTables) == 0 {
|
|
return txn.Commit(ctx)
|
|
}
|
|
|
|
sessionData := sessVars.TemporaryTableData
|
|
var (
|
|
stage kv.StagingHandle
|
|
localTempTables *infoschema.LocalTemporaryTables
|
|
)
|
|
|
|
if sessVars.LocalTemporaryTables != nil {
|
|
localTempTables = sessVars.LocalTemporaryTables.(*infoschema.LocalTemporaryTables)
|
|
} else {
|
|
localTempTables = new(infoschema.LocalTemporaryTables)
|
|
}
|
|
|
|
defer func() {
|
|
// stage != kv.InvalidStagingHandle means error occurs, we need to cleanup sessionData
|
|
if stage != kv.InvalidStagingHandle {
|
|
sessionData.Cleanup(stage)
|
|
}
|
|
}()
|
|
|
|
for tblID, tbl := range txnTempTables {
|
|
if !tbl.GetModified() {
|
|
continue
|
|
}
|
|
|
|
if tbl.GetMeta().TempTableType != model.TempTableLocal {
|
|
continue
|
|
}
|
|
if _, ok := localTempTables.TableByID(tblID); !ok {
|
|
continue
|
|
}
|
|
|
|
if stage == kv.InvalidStagingHandle {
|
|
stage = sessionData.Staging()
|
|
}
|
|
|
|
tblPrefix := tablecodec.EncodeTablePrefix(tblID)
|
|
endKey := tablecodec.EncodeTablePrefix(tblID + 1)
|
|
|
|
txnMemBuffer := s.txn.GetMemBuffer()
|
|
iter, err := txnMemBuffer.Iter(tblPrefix, endKey)
|
|
if err != nil {
|
|
return err
|
|
}
|
|
|
|
for iter.Valid() {
|
|
key := iter.Key()
|
|
if !bytes.HasPrefix(key, tblPrefix) {
|
|
break
|
|
}
|
|
|
|
value := iter.Value()
|
|
if len(value) == 0 {
|
|
err = sessionData.DeleteTableKey(tblID, key)
|
|
} else {
|
|
err = sessionData.SetTableKey(tblID, key, iter.Value())
|
|
}
|
|
|
|
if err != nil {
|
|
return err
|
|
}
|
|
|
|
err = iter.Next()
|
|
if err != nil {
|
|
return err
|
|
}
|
|
}
|
|
}
|
|
|
|
err := txn.Commit(ctx)
|
|
if err != nil {
|
|
return err
|
|
}
|
|
|
|
if stage != kv.InvalidStagingHandle {
|
|
sessionData.Release(stage)
|
|
stage = kv.InvalidStagingHandle
|
|
}
|
|
|
|
return nil
|
|
}
|
|
|
|
type temporaryTableKVFilter map[int64]tableutil.TempTable
|
|
|
|
func (m temporaryTableKVFilter) IsUnnecessaryKeyValue(key, value []byte, flags tikvstore.KeyFlags) (bool, error) {
|
|
tid := tablecodec.DecodeTableID(key)
|
|
if _, ok := m[tid]; ok {
|
|
return true, nil
|
|
}
|
|
|
|
// This is the default filter for all tables.
|
|
defaultFilter := txn.TiDBKVFilter{}
|
|
return defaultFilter.IsUnnecessaryKeyValue(key, value, flags)
|
|
}
|
|
|
|
// errIsNoisy is used to filter DUPLCATE KEY errors.
|
|
// These can observed by users in INFORMATION_SCHEMA.CLIENT_ERRORS_SUMMARY_GLOBAL instead.
|
|
//
|
|
// The rationale for filtering these errors is because they are "client generated errors". i.e.
|
|
// of the errors defined in kv/error.go, these look to be clearly related to a client-inflicted issue,
|
|
// and the server is only responsible for handling the error correctly. It does not need to log.
|
|
func errIsNoisy(err error) bool {
|
|
if kv.ErrKeyExists.Equal(err) {
|
|
return true
|
|
}
|
|
if storeerr.ErrLockAcquireFailAndNoWaitSet.Equal(err) {
|
|
return true
|
|
}
|
|
return false
|
|
}
|
|
|
|
func (s *session) doCommitWithRetry(ctx context.Context) error {
|
|
defer func() {
|
|
s.GetSessionVars().SetTxnIsolationLevelOneShotStateForNextTxn()
|
|
s.txn.changeToInvalid()
|
|
s.cleanRetryInfo()
|
|
sessiontxn.GetTxnManager(s).OnTxnEnd()
|
|
}()
|
|
if !s.txn.Valid() {
|
|
// If the transaction is invalid, maybe it has already been rolled back by the client.
|
|
return nil
|
|
}
|
|
var err error
|
|
txnSize := s.txn.Size()
|
|
isPessimistic := s.txn.IsPessimistic()
|
|
if span := opentracing.SpanFromContext(ctx); span != nil && span.Tracer() != nil {
|
|
span1 := span.Tracer().StartSpan("session.doCommitWitRetry", opentracing.ChildOf(span.Context()))
|
|
defer span1.Finish()
|
|
ctx = opentracing.ContextWithSpan(ctx, span1)
|
|
}
|
|
err = s.doCommit(ctx)
|
|
if err != nil {
|
|
commitRetryLimit := s.sessionVars.RetryLimit
|
|
if !s.sessionVars.TxnCtx.CouldRetry {
|
|
commitRetryLimit = 0
|
|
}
|
|
// Don't retry in BatchInsert mode. As a counter-example, insert into t1 select * from t2,
|
|
// BatchInsert already commit the first batch 1000 rows, then it commit 1000-2000 and retry the statement,
|
|
// Finally t1 will have more data than t2, with no errors return to user!
|
|
if s.isTxnRetryableError(err) && !s.sessionVars.BatchInsert && commitRetryLimit > 0 && !isPessimistic {
|
|
logutil.Logger(ctx).Warn("sql",
|
|
zap.String("label", s.GetSQLLabel()),
|
|
zap.Error(err),
|
|
zap.String("txn", s.txn.GoString()))
|
|
// Transactions will retry 2 ~ commitRetryLimit times.
|
|
// We make larger transactions retry less times to prevent cluster resource outage.
|
|
txnSizeRate := float64(txnSize) / float64(kv.TxnTotalSizeLimit)
|
|
maxRetryCount := commitRetryLimit - int64(float64(commitRetryLimit-1)*txnSizeRate)
|
|
err = s.retry(ctx, uint(maxRetryCount))
|
|
} else if !errIsNoisy(err) {
|
|
logutil.Logger(ctx).Warn("can not retry txn",
|
|
zap.String("label", s.GetSQLLabel()),
|
|
zap.Error(err),
|
|
zap.Bool("IsBatchInsert", s.sessionVars.BatchInsert),
|
|
zap.Bool("IsPessimistic", isPessimistic),
|
|
zap.Bool("InRestrictedSQL", s.sessionVars.InRestrictedSQL),
|
|
zap.Int64("tidb_retry_limit", s.sessionVars.RetryLimit),
|
|
zap.Bool("tidb_disable_txn_auto_retry", s.sessionVars.DisableTxnAutoRetry))
|
|
}
|
|
}
|
|
counter := s.sessionVars.TxnCtx.StatementCount
|
|
duration := time.Since(s.GetSessionVars().TxnCtx.CreateTime).Seconds()
|
|
s.recordOnTransactionExecution(err, counter, duration)
|
|
|
|
if err != nil {
|
|
if !errIsNoisy(err) {
|
|
logutil.Logger(ctx).Warn("commit failed",
|
|
zap.String("finished txn", s.txn.GoString()),
|
|
zap.Error(err))
|
|
}
|
|
return err
|
|
}
|
|
s.updateStatsDeltaToCollector()
|
|
return nil
|
|
}
|
|
|
|
func (s *session) updateStatsDeltaToCollector() {
|
|
mapper := s.GetSessionVars().TxnCtx.TableDeltaMap
|
|
if s.statsCollector != nil && mapper != nil {
|
|
for _, item := range mapper {
|
|
if item.TableID > 0 {
|
|
s.statsCollector.Update(item.TableID, item.Delta, item.Count, &item.ColSize)
|
|
}
|
|
}
|
|
}
|
|
}
|
|
|
|
func (s *session) CommitTxn(ctx context.Context) error {
|
|
if span := opentracing.SpanFromContext(ctx); span != nil && span.Tracer() != nil {
|
|
span1 := span.Tracer().StartSpan("session.CommitTxn", opentracing.ChildOf(span.Context()))
|
|
defer span1.Finish()
|
|
ctx = opentracing.ContextWithSpan(ctx, span1)
|
|
}
|
|
|
|
var commitDetail *tikvutil.CommitDetails
|
|
ctx = context.WithValue(ctx, tikvutil.CommitDetailCtxKey, &commitDetail)
|
|
err := s.doCommitWithRetry(ctx)
|
|
if commitDetail != nil {
|
|
s.sessionVars.StmtCtx.MergeExecDetails(nil, commitDetail)
|
|
}
|
|
|
|
failpoint.Inject("keepHistory", func(val failpoint.Value) {
|
|
if val.(bool) {
|
|
failpoint.Return(err)
|
|
}
|
|
})
|
|
s.sessionVars.TxnCtx.Cleanup()
|
|
s.sessionVars.CleanupTxnReadTSIfUsed()
|
|
return err
|
|
}
|
|
|
|
func (s *session) RollbackTxn(ctx context.Context) {
|
|
if span := opentracing.SpanFromContext(ctx); span != nil && span.Tracer() != nil {
|
|
span1 := span.Tracer().StartSpan("session.RollbackTxn", opentracing.ChildOf(span.Context()))
|
|
defer span1.Finish()
|
|
}
|
|
|
|
if s.txn.Valid() {
|
|
terror.Log(s.txn.Rollback())
|
|
}
|
|
if ctx.Value(inCloseSession{}) == nil {
|
|
s.cleanRetryInfo()
|
|
}
|
|
s.txn.changeToInvalid()
|
|
s.sessionVars.TxnCtx.Cleanup()
|
|
s.sessionVars.CleanupTxnReadTSIfUsed()
|
|
s.sessionVars.SetInTxn(false)
|
|
sessiontxn.GetTxnManager(s).OnTxnEnd()
|
|
}
|
|
|
|
func (s *session) GetClient() kv.Client {
|
|
return s.client
|
|
}
|
|
|
|
func (s *session) GetMPPClient() kv.MPPClient {
|
|
return s.mppClient
|
|
}
|
|
|
|
func (s *session) String() string {
|
|
// TODO: how to print binded context in values appropriately?
|
|
sessVars := s.sessionVars
|
|
data := map[string]interface{}{
|
|
"id": sessVars.ConnectionID,
|
|
"user": sessVars.User,
|
|
"currDBName": sessVars.CurrentDB,
|
|
"status": sessVars.Status,
|
|
"strictMode": sessVars.StrictSQLMode,
|
|
}
|
|
if s.txn.Valid() {
|
|
// if txn is committed or rolled back, txn is nil.
|
|
data["txn"] = s.txn.String()
|
|
}
|
|
if sessVars.SnapshotTS != 0 {
|
|
data["snapshotTS"] = sessVars.SnapshotTS
|
|
}
|
|
if sessVars.StmtCtx.LastInsertID > 0 {
|
|
data["lastInsertID"] = sessVars.StmtCtx.LastInsertID
|
|
}
|
|
if len(sessVars.PreparedStmts) > 0 {
|
|
data["preparedStmtCount"] = len(sessVars.PreparedStmts)
|
|
}
|
|
b, err := json.MarshalIndent(data, "", " ")
|
|
terror.Log(errors.Trace(err))
|
|
return string(b)
|
|
}
|
|
|
|
const sqlLogMaxLen = 1024
|
|
|
|
// SchemaChangedWithoutRetry is used for testing.
|
|
var SchemaChangedWithoutRetry uint32
|
|
|
|
func (s *session) GetSQLLabel() string {
|
|
if s.sessionVars.InRestrictedSQL {
|
|
return metrics.LblInternal
|
|
}
|
|
return metrics.LblGeneral
|
|
}
|
|
|
|
func (s *session) isInternal() bool {
|
|
return s.sessionVars.InRestrictedSQL
|
|
}
|
|
|
|
func (s *session) isTxnRetryableError(err error) bool {
|
|
if atomic.LoadUint32(&SchemaChangedWithoutRetry) == 1 {
|
|
return kv.IsTxnRetryableError(err)
|
|
}
|
|
return kv.IsTxnRetryableError(err) || domain.ErrInfoSchemaChanged.Equal(err)
|
|
}
|
|
|
|
func (s *session) checkTxnAborted(stmt sqlexec.Statement) error {
|
|
var err error
|
|
if atomic.LoadUint32(&s.GetSessionVars().TxnCtx.LockExpire) > 0 {
|
|
err = kv.ErrLockExpire
|
|
} else {
|
|
return nil
|
|
}
|
|
// If the transaction is aborted, the following statements do not need to execute, except `commit` and `rollback`,
|
|
// because they are used to finish the aborted transaction.
|
|
if _, ok := stmt.(*executor.ExecStmt).StmtNode.(*ast.CommitStmt); ok {
|
|
return nil
|
|
}
|
|
if _, ok := stmt.(*executor.ExecStmt).StmtNode.(*ast.RollbackStmt); ok {
|
|
return nil
|
|
}
|
|
return err
|
|
}
|
|
|
|
func (s *session) retry(ctx context.Context, maxCnt uint) (err error) {
|
|
var retryCnt uint
|
|
defer func() {
|
|
s.sessionVars.RetryInfo.Retrying = false
|
|
// retryCnt only increments on retryable error, so +1 here.
|
|
metrics.SessionRetry.Observe(float64(retryCnt + 1))
|
|
s.sessionVars.SetInTxn(false)
|
|
if err != nil {
|
|
s.RollbackTxn(ctx)
|
|
}
|
|
s.txn.changeToInvalid()
|
|
}()
|
|
|
|
connID := s.sessionVars.ConnectionID
|
|
s.sessionVars.RetryInfo.Retrying = true
|
|
if atomic.LoadUint32(&s.sessionVars.TxnCtx.ForUpdate) == 1 {
|
|
err = ErrForUpdateCantRetry.GenWithStackByArgs(connID)
|
|
return err
|
|
}
|
|
|
|
nh := GetHistory(s)
|
|
var schemaVersion int64
|
|
sessVars := s.GetSessionVars()
|
|
orgStartTS := sessVars.TxnCtx.StartTS
|
|
label := s.GetSQLLabel()
|
|
for {
|
|
if err = s.PrepareTxnCtx(ctx); err != nil {
|
|
return err
|
|
}
|
|
s.sessionVars.RetryInfo.ResetOffset()
|
|
for i, sr := range nh.history {
|
|
st := sr.st
|
|
s.sessionVars.StmtCtx = sr.stmtCtx
|
|
s.sessionVars.StmtCtx.ResetForRetry()
|
|
s.sessionVars.PreparedParams = s.sessionVars.PreparedParams[:0]
|
|
schemaVersion, err = st.RebuildPlan(ctx)
|
|
if err != nil {
|
|
return err
|
|
}
|
|
|
|
if retryCnt == 0 {
|
|
// We do not have to log the query every time.
|
|
// We print the queries at the first try only.
|
|
sql := sqlForLog(st.GetTextToLog())
|
|
if !sessVars.EnableRedactLog {
|
|
sql += sessVars.PreparedParams.String()
|
|
}
|
|
logutil.Logger(ctx).Warn("retrying",
|
|
zap.Int64("schemaVersion", schemaVersion),
|
|
zap.Uint("retryCnt", retryCnt),
|
|
zap.Int("queryNum", i),
|
|
zap.String("sql", sql))
|
|
} else {
|
|
logutil.Logger(ctx).Warn("retrying",
|
|
zap.Int64("schemaVersion", schemaVersion),
|
|
zap.Uint("retryCnt", retryCnt),
|
|
zap.Int("queryNum", i))
|
|
}
|
|
_, digest := s.sessionVars.StmtCtx.SQLDigest()
|
|
s.txn.onStmtStart(digest.String())
|
|
if err = sessiontxn.GetTxnManager(s).OnStmtStart(ctx, st.GetStmtNode()); err == nil {
|
|
_, err = st.Exec(ctx)
|
|
}
|
|
s.txn.onStmtEnd()
|
|
if err != nil {
|
|
s.StmtRollback()
|
|
break
|
|
}
|
|
s.StmtCommit()
|
|
}
|
|
logutil.Logger(ctx).Warn("transaction association",
|
|
zap.Uint64("retrying txnStartTS", s.GetSessionVars().TxnCtx.StartTS),
|
|
zap.Uint64("original txnStartTS", orgStartTS))
|
|
failpoint.Inject("preCommitHook", func() {
|
|
hook, ok := ctx.Value("__preCommitHook").(func())
|
|
if ok {
|
|
hook()
|
|
}
|
|
})
|
|
if err == nil {
|
|
err = s.doCommit(ctx)
|
|
if err == nil {
|
|
break
|
|
}
|
|
}
|
|
if !s.isTxnRetryableError(err) {
|
|
logutil.Logger(ctx).Warn("sql",
|
|
zap.String("label", label),
|
|
zap.Stringer("session", s),
|
|
zap.Error(err))
|
|
metrics.SessionRetryErrorCounter.WithLabelValues(label, metrics.LblUnretryable).Inc()
|
|
return err
|
|
}
|
|
retryCnt++
|
|
if retryCnt >= maxCnt {
|
|
logutil.Logger(ctx).Warn("sql",
|
|
zap.String("label", label),
|
|
zap.Uint("retry reached max count", retryCnt))
|
|
metrics.SessionRetryErrorCounter.WithLabelValues(label, metrics.LblReachMax).Inc()
|
|
return err
|
|
}
|
|
logutil.Logger(ctx).Warn("sql",
|
|
zap.String("label", label),
|
|
zap.Error(err),
|
|
zap.String("txn", s.txn.GoString()))
|
|
kv.BackOff(retryCnt)
|
|
s.txn.changeToInvalid()
|
|
s.sessionVars.SetInTxn(false)
|
|
}
|
|
return err
|
|
}
|
|
|
|
func sqlForLog(sql string) string {
|
|
if len(sql) > sqlLogMaxLen {
|
|
sql = sql[:sqlLogMaxLen] + fmt.Sprintf("(len:%d)", len(sql))
|
|
}
|
|
return executor.QueryReplacer.Replace(sql)
|
|
}
|
|
|
|
type sessionPool interface {
|
|
Get() (pools.Resource, error)
|
|
Put(pools.Resource)
|
|
}
|
|
|
|
func (s *session) sysSessionPool() sessionPool {
|
|
return domain.GetDomain(s).SysSessionPool()
|
|
}
|
|
|
|
func createSessionFunc(store kv.Storage) pools.Factory {
|
|
return func() (pools.Resource, error) {
|
|
se, err := createSession(store)
|
|
if err != nil {
|
|
return nil, err
|
|
}
|
|
err = se.sessionVars.SetSystemVar(variable.AutoCommit, "1")
|
|
if err != nil {
|
|
return nil, err
|
|
}
|
|
err = se.sessionVars.SetSystemVar(variable.MaxExecutionTime, "0")
|
|
if err != nil {
|
|
return nil, errors.Trace(err)
|
|
}
|
|
err = se.sessionVars.SetSystemVar(variable.MaxAllowedPacket, strconv.FormatUint(variable.DefMaxAllowedPacket, 10))
|
|
if err != nil {
|
|
return nil, errors.Trace(err)
|
|
}
|
|
err = se.sessionVars.SetSystemVar(variable.TiDBEnableWindowFunction, variable.BoolToOnOff(variable.DefEnableWindowFunction))
|
|
if err != nil {
|
|
return nil, errors.Trace(err)
|
|
}
|
|
se.sessionVars.CommonGlobalLoaded = true
|
|
se.sessionVars.InRestrictedSQL = true
|
|
// Internal session uses default format to prevent memory leak problem.
|
|
se.sessionVars.EnableChunkRPC = false
|
|
return se, nil
|
|
}
|
|
}
|
|
|
|
func createSessionWithDomainFunc(store kv.Storage) func(*domain.Domain) (pools.Resource, error) {
|
|
return func(dom *domain.Domain) (pools.Resource, error) {
|
|
se, err := CreateSessionWithDomain(store, dom)
|
|
if err != nil {
|
|
return nil, err
|
|
}
|
|
err = se.sessionVars.SetSystemVar(variable.AutoCommit, "1")
|
|
if err != nil {
|
|
return nil, err
|
|
}
|
|
err = se.sessionVars.SetSystemVar(variable.MaxExecutionTime, "0")
|
|
if err != nil {
|
|
return nil, errors.Trace(err)
|
|
}
|
|
se.sessionVars.CommonGlobalLoaded = true
|
|
se.sessionVars.InRestrictedSQL = true
|
|
// Internal session uses default format to prevent memory leak problem.
|
|
se.sessionVars.EnableChunkRPC = false
|
|
return se, nil
|
|
}
|
|
}
|
|
|
|
func drainRecordSet(ctx context.Context, se *session, rs sqlexec.RecordSet, alloc chunk.Allocator) ([]chunk.Row, error) {
|
|
var rows []chunk.Row
|
|
var req *chunk.Chunk
|
|
req = rs.NewChunk(alloc)
|
|
for {
|
|
err := rs.Next(ctx, req)
|
|
if err != nil || req.NumRows() == 0 {
|
|
return rows, err
|
|
}
|
|
iter := chunk.NewIterator4Chunk(req)
|
|
for r := iter.Begin(); r != iter.End(); r = iter.Next() {
|
|
rows = append(rows, r)
|
|
}
|
|
req = chunk.Renew(req, se.sessionVars.MaxChunkSize)
|
|
}
|
|
}
|
|
|
|
// getTableValue executes restricted sql and the result is one column.
|
|
// It returns a string value.
|
|
func (s *session) getTableValue(ctx context.Context, tblName string, varName string) (string, error) {
|
|
if ctx.Value(kv.RequestSourceKey) == nil {
|
|
ctx = kv.WithInternalSourceType(ctx, kv.InternalTxnSysVar)
|
|
}
|
|
rows, fields, err := s.ExecRestrictedSQL(ctx, nil, "SELECT VARIABLE_VALUE FROM %n.%n WHERE VARIABLE_NAME=%?", mysql.SystemDB, tblName, varName)
|
|
if err != nil {
|
|
return "", err
|
|
}
|
|
if len(rows) == 0 {
|
|
return "", errResultIsEmpty
|
|
}
|
|
d := rows[0].GetDatum(0, &fields[0].Column.FieldType)
|
|
value, err := d.ToString()
|
|
if err != nil {
|
|
return "", err
|
|
}
|
|
return value, nil
|
|
}
|
|
|
|
// replaceGlobalVariablesTableValue executes restricted sql updates the variable value
|
|
// It will then notify the etcd channel that the value has changed.
|
|
func (s *session) replaceGlobalVariablesTableValue(ctx context.Context, varName, val string) error {
|
|
ctx = kv.WithInternalSourceType(ctx, kv.InternalTxnSysVar)
|
|
_, _, err := s.ExecRestrictedSQL(ctx, nil, `REPLACE INTO %n.%n (variable_name, variable_value) VALUES (%?, %?)`, mysql.SystemDB, mysql.GlobalVariablesTable, varName, val)
|
|
if err != nil {
|
|
return err
|
|
}
|
|
domain.GetDomain(s).NotifyUpdateSysVarCache()
|
|
return err
|
|
}
|
|
|
|
// GetGlobalSysVar implements GlobalVarAccessor.GetGlobalSysVar interface.
|
|
func (s *session) GetGlobalSysVar(name string) (string, error) {
|
|
if s.Value(sessionctx.Initing) != nil {
|
|
// When running bootstrap or upgrade, we should not access global storage.
|
|
return "", nil
|
|
}
|
|
|
|
sv := variable.GetSysVar(name)
|
|
if sv == nil {
|
|
// It might be a recently unregistered sysvar. We should return unknown
|
|
// since GetSysVar is the canonical version, but we can update the cache
|
|
// so the next request doesn't attempt to load this.
|
|
logutil.BgLogger().Info("sysvar does not exist. sysvar cache may be stale", zap.String("name", name))
|
|
return "", variable.ErrUnknownSystemVar.GenWithStackByArgs(name)
|
|
}
|
|
|
|
sysVar, err := domain.GetDomain(s).GetGlobalVar(name)
|
|
if err != nil {
|
|
// The sysvar exists, but there is no cache entry yet.
|
|
// This might be because the sysvar was only recently registered.
|
|
// In which case it is safe to return the default, but we can also
|
|
// update the cache for the future.
|
|
logutil.BgLogger().Info("sysvar not in cache yet. sysvar cache may be stale", zap.String("name", name))
|
|
sysVar, err = s.getTableValue(context.TODO(), mysql.GlobalVariablesTable, name)
|
|
if err != nil {
|
|
return sv.Value, nil
|
|
}
|
|
}
|
|
// It might have been written from an earlier TiDB version, so we should do type validation
|
|
// See https://github.com/pingcap/tidb/issues/30255 for why we don't do full validation.
|
|
// If validation fails, we should return the default value:
|
|
// See: https://github.com/pingcap/tidb/pull/31566
|
|
sysVar, err = sv.ValidateFromType(s.GetSessionVars(), sysVar, variable.ScopeGlobal)
|
|
if err != nil {
|
|
return sv.Value, nil
|
|
}
|
|
return sysVar, nil
|
|
}
|
|
|
|
// SetGlobalSysVar implements GlobalVarAccessor.SetGlobalSysVar interface.
|
|
// it is called (but skipped) when setting instance scope
|
|
func (s *session) SetGlobalSysVar(name, value string) (err error) {
|
|
sv := variable.GetSysVar(name)
|
|
if sv == nil {
|
|
return variable.ErrUnknownSystemVar.GenWithStackByArgs(name)
|
|
}
|
|
if value, err = sv.Validate(s.sessionVars, value, variable.ScopeGlobal); err != nil {
|
|
return err
|
|
}
|
|
if err = sv.SetGlobalFromHook(s.sessionVars, value, false); err != nil {
|
|
return err
|
|
}
|
|
if sv.HasInstanceScope() { // skip for INSTANCE scope
|
|
return nil
|
|
}
|
|
if sv.GlobalConfigName != "" {
|
|
domain.GetDomain(s).NotifyGlobalConfigChange(sv.GlobalConfigName, variable.OnOffToTrueFalse(value))
|
|
}
|
|
return s.replaceGlobalVariablesTableValue(context.TODO(), sv.Name, value)
|
|
}
|
|
|
|
// SetGlobalSysVarOnly updates the sysvar, but does not call the validation function or update aliases.
|
|
// This is helpful to prevent duplicate warnings being appended from aliases, or recursion.
|
|
func (s *session) SetGlobalSysVarOnly(name, value string) (err error) {
|
|
sv := variable.GetSysVar(name)
|
|
if sv == nil {
|
|
return variable.ErrUnknownSystemVar.GenWithStackByArgs(name)
|
|
}
|
|
if err = sv.SetGlobalFromHook(s.sessionVars, value, true); err != nil {
|
|
return err
|
|
}
|
|
if sv.HasInstanceScope() { // skip for INSTANCE scope
|
|
return nil
|
|
}
|
|
return s.replaceGlobalVariablesTableValue(context.TODO(), sv.Name, value)
|
|
}
|
|
|
|
// SetTiDBTableValue implements GlobalVarAccessor.SetTiDBTableValue interface.
|
|
func (s *session) SetTiDBTableValue(name, value, comment string) error {
|
|
ctx := kv.WithInternalSourceType(context.Background(), kv.InternalTxnSysVar)
|
|
_, _, err := s.ExecRestrictedSQL(ctx, nil, `REPLACE INTO mysql.tidb (variable_name, variable_value, comment) VALUES (%?, %?, %?)`, name, value, comment)
|
|
return err
|
|
}
|
|
|
|
// GetTiDBTableValue implements GlobalVarAccessor.GetTiDBTableValue interface.
|
|
func (s *session) GetTiDBTableValue(name string) (string, error) {
|
|
return s.getTableValue(context.TODO(), mysql.TiDBTable, name)
|
|
}
|
|
|
|
var _ sqlexec.SQLParser = &session{}
|
|
|
|
func (s *session) ParseSQL(ctx context.Context, sql string, params ...parser.ParseParam) ([]ast.StmtNode, []error, error) {
|
|
if span := opentracing.SpanFromContext(ctx); span != nil && span.Tracer() != nil {
|
|
span1 := span.Tracer().StartSpan("session.ParseSQL", opentracing.ChildOf(span.Context()))
|
|
defer span1.Finish()
|
|
}
|
|
defer trace.StartRegion(ctx, "ParseSQL").End()
|
|
|
|
p := parserPool.Get().(*parser.Parser)
|
|
defer parserPool.Put(p)
|
|
p.SetSQLMode(s.sessionVars.SQLMode)
|
|
p.SetParserConfig(s.sessionVars.BuildParserConfig())
|
|
tmp, warn, err := p.ParseSQL(sql, params...)
|
|
// The []ast.StmtNode is referenced by the parser, to reuse the parser, make a copy of the result.
|
|
res := make([]ast.StmtNode, len(tmp))
|
|
copy(res, tmp)
|
|
return res, warn, err
|
|
}
|
|
|
|
func (s *session) SetProcessInfo(sql string, t time.Time, command byte, maxExecutionTime uint64) {
|
|
// If command == mysql.ComSleep, it means the SQL execution is finished. The processinfo is reset to SLEEP.
|
|
// If the SQL finished and the session is not in transaction, the current start timestamp need to reset to 0.
|
|
// Otherwise, it should be set to the transaction start timestamp.
|
|
// Why not reset the transaction start timestamp to 0 when transaction committed?
|
|
// Because the select statement and other statements need this timestamp to read data,
|
|
// after the transaction is committed. e.g. SHOW MASTER STATUS;
|
|
var curTxnStartTS uint64
|
|
if command != mysql.ComSleep || s.GetSessionVars().InTxn() {
|
|
curTxnStartTS = s.sessionVars.TxnCtx.StartTS
|
|
}
|
|
// Set curTxnStartTS to SnapshotTS directly when the session is trying to historic read.
|
|
// It will avoid the session meet GC lifetime too short error.
|
|
if s.GetSessionVars().SnapshotTS != 0 {
|
|
curTxnStartTS = s.GetSessionVars().SnapshotTS
|
|
}
|
|
p := s.currentPlan
|
|
if explain, ok := p.(*plannercore.Explain); ok && explain.Analyze && explain.TargetPlan != nil {
|
|
p = explain.TargetPlan
|
|
}
|
|
pi := util.ProcessInfo{
|
|
ID: s.sessionVars.ConnectionID,
|
|
Port: s.sessionVars.Port,
|
|
DB: s.sessionVars.CurrentDB,
|
|
Command: command,
|
|
Plan: p,
|
|
PlanExplainRows: plannercore.GetExplainRowsForPlan(p),
|
|
RuntimeStatsColl: s.sessionVars.StmtCtx.RuntimeStatsColl,
|
|
Time: t,
|
|
State: s.Status(),
|
|
Info: sql,
|
|
CurTxnStartTS: curTxnStartTS,
|
|
StmtCtx: s.sessionVars.StmtCtx,
|
|
StatsInfo: plannercore.GetStatsInfo,
|
|
MaxExecutionTime: maxExecutionTime,
|
|
RedactSQL: s.sessionVars.EnableRedactLog,
|
|
}
|
|
oldPi := s.ShowProcess()
|
|
if p == nil {
|
|
// Store the last valid plan when the current plan is nil.
|
|
// This is for `explain for connection` statement has the ability to query the last valid plan.
|
|
if oldPi != nil && oldPi.Plan != nil && len(oldPi.PlanExplainRows) > 0 {
|
|
pi.Plan = oldPi.Plan
|
|
pi.PlanExplainRows = oldPi.PlanExplainRows
|
|
pi.RuntimeStatsColl = oldPi.RuntimeStatsColl
|
|
}
|
|
}
|
|
// We set process info before building plan, so we extended execution time.
|
|
if oldPi != nil && oldPi.Info == pi.Info {
|
|
pi.Time = oldPi.Time
|
|
}
|
|
_, digest := s.sessionVars.StmtCtx.SQLDigest()
|
|
pi.Digest = digest.String()
|
|
// DO NOT reset the currentPlan to nil until this query finishes execution, otherwise reentrant calls
|
|
// of SetProcessInfo would override Plan and PlanExplainRows to nil.
|
|
if command == mysql.ComSleep {
|
|
s.currentPlan = nil
|
|
}
|
|
if s.sessionVars.User != nil {
|
|
pi.User = s.sessionVars.User.Username
|
|
pi.Host = s.sessionVars.User.Hostname
|
|
}
|
|
s.processInfo.Store(&pi)
|
|
}
|
|
|
|
func (s *session) SetDiskFullOpt(level kvrpcpb.DiskFullOpt) {
|
|
s.diskFullOpt = level
|
|
}
|
|
|
|
func (s *session) GetDiskFullOpt() kvrpcpb.DiskFullOpt {
|
|
return s.diskFullOpt
|
|
}
|
|
|
|
func (s *session) ClearDiskFullOpt() {
|
|
s.diskFullOpt = kvrpcpb.DiskFullOpt_NotAllowedOnFull
|
|
}
|
|
|
|
func (s *session) ExecuteInternal(ctx context.Context, sql string, args ...interface{}) (rs sqlexec.RecordSet, err error) {
|
|
origin := s.sessionVars.InRestrictedSQL
|
|
s.sessionVars.InRestrictedSQL = true
|
|
defer func() {
|
|
s.sessionVars.InRestrictedSQL = origin
|
|
// Restore the goroutine label by using the original ctx after execution is finished.
|
|
pprof.SetGoroutineLabels(ctx)
|
|
}()
|
|
|
|
if span := opentracing.SpanFromContext(ctx); span != nil && span.Tracer() != nil {
|
|
span1 := span.Tracer().StartSpan("session.ExecuteInternal", opentracing.ChildOf(span.Context()))
|
|
defer span1.Finish()
|
|
ctx = opentracing.ContextWithSpan(ctx, span1)
|
|
logutil.Eventf(ctx, "execute: %s", sql)
|
|
}
|
|
|
|
stmtNode, err := s.ParseWithParams(ctx, sql, args...)
|
|
if err != nil {
|
|
return nil, err
|
|
}
|
|
|
|
rs, err = s.ExecuteStmt(ctx, stmtNode)
|
|
if err != nil {
|
|
s.sessionVars.StmtCtx.AppendError(err)
|
|
}
|
|
if rs == nil {
|
|
return nil, err
|
|
}
|
|
|
|
return rs, err
|
|
}
|
|
|
|
// Execute is deprecated, we can remove it as soon as plugins are migrated.
|
|
func (s *session) Execute(ctx context.Context, sql string) (recordSets []sqlexec.RecordSet, err error) {
|
|
if span := opentracing.SpanFromContext(ctx); span != nil && span.Tracer() != nil {
|
|
span1 := span.Tracer().StartSpan("session.Execute", opentracing.ChildOf(span.Context()))
|
|
defer span1.Finish()
|
|
ctx = opentracing.ContextWithSpan(ctx, span1)
|
|
logutil.Eventf(ctx, "execute: %s", sql)
|
|
}
|
|
|
|
stmtNodes, err := s.Parse(ctx, sql)
|
|
if err != nil {
|
|
return nil, err
|
|
}
|
|
if len(stmtNodes) != 1 {
|
|
return nil, errors.New("Execute() API doesn't support multiple statements any more")
|
|
}
|
|
|
|
rs, err := s.ExecuteStmt(ctx, stmtNodes[0])
|
|
if err != nil {
|
|
s.sessionVars.StmtCtx.AppendError(err)
|
|
}
|
|
if rs == nil {
|
|
return nil, err
|
|
}
|
|
return []sqlexec.RecordSet{rs}, err
|
|
}
|
|
|
|
// Parameterize Parameterizes this sql.
|
|
func (s *session) Parameterize(ctx context.Context, originSQL string) (exec *ast.ExecuteStmt, ok bool) {
|
|
if !s.GetSessionVars().EnableGeneralPlanCache {
|
|
return nil, false
|
|
}
|
|
paramSQL, params, ok, err := plannercore.Parameterize(s, originSQL)
|
|
if !ok || err != nil {
|
|
return nil, false
|
|
}
|
|
cachedStmt, err := s.CacheGeneralStmt(paramSQL)
|
|
if err != nil {
|
|
return nil, false
|
|
}
|
|
return &ast.ExecuteStmt{
|
|
BinaryArgs: params,
|
|
PrepStmt: cachedStmt,
|
|
FromGeneralStmt: true,
|
|
}, true
|
|
}
|
|
|
|
// Parse parses a query string to raw ast.StmtNode.
|
|
func (s *session) Parse(ctx context.Context, sql string) ([]ast.StmtNode, error) {
|
|
parseStartTime := time.Now()
|
|
stmts, warns, err := s.ParseSQL(ctx, sql, s.sessionVars.GetParseParams()...)
|
|
if err != nil {
|
|
s.rollbackOnError(ctx)
|
|
err = util.SyntaxError(err)
|
|
|
|
// Only print log message when this SQL is from the user.
|
|
// Mute the warning for internal SQLs.
|
|
if !s.sessionVars.InRestrictedSQL {
|
|
if s.sessionVars.EnableRedactLog {
|
|
logutil.Logger(ctx).Debug("parse SQL failed", zap.Error(err), zap.String("SQL", sql))
|
|
} else {
|
|
logutil.Logger(ctx).Warn("parse SQL failed", zap.Error(err), zap.String("SQL", sql))
|
|
}
|
|
s.sessionVars.StmtCtx.AppendError(err)
|
|
}
|
|
return nil, err
|
|
}
|
|
|
|
durParse := time.Since(parseStartTime)
|
|
s.GetSessionVars().DurationParse = durParse
|
|
isInternal := s.isInternal()
|
|
if isInternal {
|
|
sessionExecuteParseDurationInternal.Observe(durParse.Seconds())
|
|
} else {
|
|
sessionExecuteParseDurationGeneral.Observe(durParse.Seconds())
|
|
}
|
|
for _, warn := range warns {
|
|
s.sessionVars.StmtCtx.AppendWarning(util.SyntaxWarn(warn))
|
|
}
|
|
return stmts, nil
|
|
}
|
|
|
|
// ParseWithParams parses a query string, with arguments, to raw ast.StmtNode.
|
|
// Note that it will not do escaping if no variable arguments are passed.
|
|
func (s *session) ParseWithParams(ctx context.Context, sql string, args ...interface{}) (ast.StmtNode, error) {
|
|
var err error
|
|
if len(args) > 0 {
|
|
sql, err = sqlexec.EscapeSQL(sql, args...)
|
|
if err != nil {
|
|
return nil, err
|
|
}
|
|
}
|
|
|
|
internal := s.isInternal()
|
|
|
|
var stmts []ast.StmtNode
|
|
var warns []error
|
|
parseStartTime := time.Now()
|
|
if internal {
|
|
// Do no respect the settings from clients, if it is for internal usage.
|
|
// Charsets from clients may give chance injections.
|
|
// Refer to https://stackoverflow.com/questions/5741187/sql-injection-that-gets-around-mysql-real-escape-string/12118602.
|
|
stmts, warns, err = s.ParseSQL(ctx, sql)
|
|
} else {
|
|
stmts, warns, err = s.ParseSQL(ctx, sql, s.sessionVars.GetParseParams()...)
|
|
}
|
|
if len(stmts) != 1 {
|
|
err = errors.New("run multiple statements internally is not supported")
|
|
}
|
|
if err != nil {
|
|
s.rollbackOnError(ctx)
|
|
// Only print log message when this SQL is from the user.
|
|
// Mute the warning for internal SQLs.
|
|
if !s.sessionVars.InRestrictedSQL {
|
|
if s.sessionVars.EnableRedactLog {
|
|
logutil.Logger(ctx).Debug("parse SQL failed", zap.Error(err), zap.String("SQL", sql))
|
|
} else {
|
|
logutil.Logger(ctx).Warn("parse SQL failed", zap.Error(err), zap.String("SQL", sql))
|
|
}
|
|
}
|
|
return nil, util.SyntaxError(err)
|
|
}
|
|
durParse := time.Since(parseStartTime)
|
|
if internal {
|
|
sessionExecuteParseDurationInternal.Observe(durParse.Seconds())
|
|
} else {
|
|
sessionExecuteParseDurationGeneral.Observe(durParse.Seconds())
|
|
}
|
|
for _, warn := range warns {
|
|
s.sessionVars.StmtCtx.AppendWarning(util.SyntaxWarn(warn))
|
|
}
|
|
if topsqlstate.TopSQLEnabled() {
|
|
normalized, digest := parser.NormalizeDigest(sql)
|
|
if digest != nil {
|
|
// Reset the goroutine label when internal sql execute finish.
|
|
// Specifically reset in ExecRestrictedStmt function.
|
|
s.sessionVars.StmtCtx.IsSQLRegistered.Store(true)
|
|
topsql.AttachAndRegisterSQLInfo(ctx, normalized, digest, s.sessionVars.InRestrictedSQL)
|
|
}
|
|
}
|
|
return stmts[0], nil
|
|
}
|
|
|
|
// GetAdvisoryLock acquires an advisory lock of lockName.
|
|
// Note that a lock can be acquired multiple times by the same session,
|
|
// in which case we increment a reference count.
|
|
// Each lock needs to be held in a unique session because
|
|
// we need to be able to ROLLBACK in any arbitrary order
|
|
// in order to release the locks.
|
|
func (s *session) GetAdvisoryLock(lockName string, timeout int64) error {
|
|
if lock, ok := s.advisoryLocks[lockName]; ok {
|
|
lock.IncrReferences()
|
|
return nil
|
|
}
|
|
sess, err := createSession(s.GetStore())
|
|
if err != nil {
|
|
return err
|
|
}
|
|
lock := &advisoryLock{session: sess, ctx: context.TODO()}
|
|
err = lock.GetLock(lockName, timeout)
|
|
if err != nil {
|
|
return err
|
|
}
|
|
s.advisoryLocks[lockName] = lock
|
|
return nil
|
|
}
|
|
|
|
// ReleaseAdvisoryLock releases an advisory locks held by the session.
|
|
// It returns FALSE if no lock by this name was held (by this session),
|
|
// and TRUE if a lock was held and "released".
|
|
// Note that the lock is not actually released if there are multiple
|
|
// references to the same lockName by the session, instead the reference
|
|
// count is decremented.
|
|
func (s *session) ReleaseAdvisoryLock(lockName string) (released bool) {
|
|
if lock, ok := s.advisoryLocks[lockName]; ok {
|
|
lock.DecrReferences()
|
|
if lock.ReferenceCount() <= 0 {
|
|
lock.Close()
|
|
delete(s.advisoryLocks, lockName)
|
|
}
|
|
return true
|
|
}
|
|
return false
|
|
}
|
|
|
|
// ReleaseAllAdvisoryLocks releases all advisory locks held by the session
|
|
// and returns a count of the locks that were released.
|
|
// The count is based on unique locks held, so multiple references
|
|
// to the same lock do not need to be accounted for.
|
|
func (s *session) ReleaseAllAdvisoryLocks() int {
|
|
var count int
|
|
for lockName, lock := range s.advisoryLocks {
|
|
lock.Close()
|
|
count += lock.ReferenceCount()
|
|
delete(s.advisoryLocks, lockName)
|
|
}
|
|
return count
|
|
}
|
|
|
|
// ParseWithParams4Test wrapper (s *session) ParseWithParams for test
|
|
func ParseWithParams4Test(ctx context.Context, s Session,
|
|
sql string, args ...interface{}) (ast.StmtNode, error) {
|
|
return s.(*session).ParseWithParams(ctx, sql, args)
|
|
}
|
|
|
|
var _ sqlexec.RestrictedSQLExecutor = &session{}
|
|
var _ sqlexec.SQLExecutor = &session{}
|
|
|
|
// ExecRestrictedStmt implements RestrictedSQLExecutor interface.
|
|
func (s *session) ExecRestrictedStmt(ctx context.Context, stmtNode ast.StmtNode, opts ...sqlexec.OptionFuncAlias) (
|
|
[]chunk.Row, []*ast.ResultField, error) {
|
|
defer pprof.SetGoroutineLabels(ctx)
|
|
execOption := sqlexec.GetExecOption(opts)
|
|
var se *session
|
|
var clean func()
|
|
var err error
|
|
if execOption.UseCurSession {
|
|
se, clean, err = s.useCurrentSession(execOption)
|
|
} else {
|
|
se, clean, err = s.getInternalSession(execOption)
|
|
}
|
|
if err != nil {
|
|
return nil, nil, err
|
|
}
|
|
defer clean()
|
|
|
|
startTime := time.Now()
|
|
metrics.SessionRestrictedSQLCounter.Inc()
|
|
ctx = context.WithValue(ctx, execdetails.StmtExecDetailKey, &execdetails.StmtExecDetails{})
|
|
ctx = context.WithValue(ctx, tikvutil.ExecDetailsKey, &tikvutil.ExecDetails{})
|
|
rs, err := se.ExecuteStmt(ctx, stmtNode)
|
|
if err != nil {
|
|
se.sessionVars.StmtCtx.AppendError(err)
|
|
}
|
|
if rs == nil {
|
|
return nil, nil, err
|
|
}
|
|
defer func() {
|
|
if closeErr := rs.Close(); closeErr != nil {
|
|
err = closeErr
|
|
}
|
|
}()
|
|
var rows []chunk.Row
|
|
rows, err = drainRecordSet(ctx, se, rs, nil)
|
|
if err != nil {
|
|
return nil, nil, err
|
|
}
|
|
metrics.QueryDurationHistogram.WithLabelValues(metrics.LblInternal).Observe(time.Since(startTime).Seconds())
|
|
return rows, rs.Fields(), err
|
|
}
|
|
|
|
// ExecRestrictedStmt4Test wrapper `(s *session) ExecRestrictedStmt` for test.
|
|
func ExecRestrictedStmt4Test(ctx context.Context, s Session,
|
|
stmtNode ast.StmtNode, opts ...sqlexec.OptionFuncAlias) (
|
|
[]chunk.Row, []*ast.ResultField, error) {
|
|
ctx = kv.WithInternalSourceType(ctx, kv.InternalTxnOthers)
|
|
return s.(*session).ExecRestrictedStmt(ctx, stmtNode, opts...)
|
|
}
|
|
|
|
// only set and clean session with execOption
|
|
func (s *session) useCurrentSession(execOption sqlexec.ExecOption) (*session, func(), error) {
|
|
var err error
|
|
orgSnapshotInfoSchema, orgSnapshotTS := s.sessionVars.SnapshotInfoschema, s.sessionVars.SnapshotTS
|
|
if execOption.SnapshotTS != 0 {
|
|
if err = s.sessionVars.SetSystemVar(variable.TiDBSnapshot, strconv.FormatUint(execOption.SnapshotTS, 10)); err != nil {
|
|
return nil, nil, err
|
|
}
|
|
s.sessionVars.SnapshotInfoschema, err = getSnapshotInfoSchema(s, execOption.SnapshotTS)
|
|
if err != nil {
|
|
return nil, nil, err
|
|
}
|
|
}
|
|
prevStatsVer := s.sessionVars.AnalyzeVersion
|
|
if execOption.AnalyzeVer != 0 {
|
|
s.sessionVars.AnalyzeVersion = execOption.AnalyzeVer
|
|
}
|
|
prevAnalyzeSnapshot := s.sessionVars.EnableAnalyzeSnapshot
|
|
if execOption.AnalyzeSnapshot != nil {
|
|
s.sessionVars.EnableAnalyzeSnapshot = *execOption.AnalyzeSnapshot
|
|
}
|
|
prePruneMode := s.sessionVars.PartitionPruneMode.Load()
|
|
if len(execOption.PartitionPruneMode) > 0 {
|
|
s.sessionVars.PartitionPruneMode.Store(execOption.PartitionPruneMode)
|
|
}
|
|
prevSQL := s.sessionVars.StmtCtx.OriginalSQL
|
|
prevStmtType := s.sessionVars.StmtCtx.StmtType
|
|
prevTables := s.sessionVars.StmtCtx.Tables
|
|
return s, func() {
|
|
s.sessionVars.AnalyzeVersion = prevStatsVer
|
|
s.sessionVars.EnableAnalyzeSnapshot = prevAnalyzeSnapshot
|
|
if err := s.sessionVars.SetSystemVar(variable.TiDBSnapshot, ""); err != nil {
|
|
logutil.BgLogger().Error("set tidbSnapshot error", zap.Error(err))
|
|
}
|
|
s.sessionVars.SnapshotInfoschema = orgSnapshotInfoSchema
|
|
s.sessionVars.SnapshotTS = orgSnapshotTS
|
|
s.sessionVars.PartitionPruneMode.Store(prePruneMode)
|
|
s.sessionVars.StmtCtx.OriginalSQL = prevSQL
|
|
s.sessionVars.StmtCtx.StmtType = prevStmtType
|
|
s.sessionVars.StmtCtx.Tables = prevTables
|
|
}, nil
|
|
}
|
|
|
|
func (s *session) getInternalSession(execOption sqlexec.ExecOption) (*session, func(), error) {
|
|
tmp, err := s.sysSessionPool().Get()
|
|
if err != nil {
|
|
return nil, nil, errors.Trace(err)
|
|
}
|
|
se := tmp.(*session)
|
|
|
|
// The special session will share the `InspectionTableCache` with current session
|
|
// if the current session in inspection mode.
|
|
if cache := s.sessionVars.InspectionTableCache; cache != nil {
|
|
se.sessionVars.InspectionTableCache = cache
|
|
}
|
|
if ok := s.sessionVars.OptimizerUseInvisibleIndexes; ok {
|
|
se.sessionVars.OptimizerUseInvisibleIndexes = true
|
|
}
|
|
|
|
if execOption.SnapshotTS != 0 {
|
|
if err := se.sessionVars.SetSystemVar(variable.TiDBSnapshot, strconv.FormatUint(execOption.SnapshotTS, 10)); err != nil {
|
|
return nil, nil, err
|
|
}
|
|
se.sessionVars.SnapshotInfoschema, err = getSnapshotInfoSchema(s, execOption.SnapshotTS)
|
|
if err != nil {
|
|
return nil, nil, err
|
|
}
|
|
}
|
|
|
|
prevStatsVer := se.sessionVars.AnalyzeVersion
|
|
if execOption.AnalyzeVer != 0 {
|
|
se.sessionVars.AnalyzeVersion = execOption.AnalyzeVer
|
|
}
|
|
|
|
prevAnalyzeSnapshot := se.sessionVars.EnableAnalyzeSnapshot
|
|
if execOption.AnalyzeSnapshot != nil {
|
|
se.sessionVars.EnableAnalyzeSnapshot = *execOption.AnalyzeSnapshot
|
|
}
|
|
|
|
prePruneMode := se.sessionVars.PartitionPruneMode.Load()
|
|
if len(execOption.PartitionPruneMode) > 0 {
|
|
se.sessionVars.PartitionPruneMode.Store(execOption.PartitionPruneMode)
|
|
}
|
|
|
|
return se, func() {
|
|
se.sessionVars.AnalyzeVersion = prevStatsVer
|
|
se.sessionVars.EnableAnalyzeSnapshot = prevAnalyzeSnapshot
|
|
if err := se.sessionVars.SetSystemVar(variable.TiDBSnapshot, ""); err != nil {
|
|
logutil.BgLogger().Error("set tidbSnapshot error", zap.Error(err))
|
|
}
|
|
se.sessionVars.SnapshotInfoschema = nil
|
|
se.sessionVars.SnapshotTS = 0
|
|
if !execOption.IgnoreWarning {
|
|
if se != nil && se.GetSessionVars().StmtCtx.WarningCount() > 0 {
|
|
warnings := se.GetSessionVars().StmtCtx.GetWarnings()
|
|
s.GetSessionVars().StmtCtx.AppendWarnings(warnings)
|
|
}
|
|
}
|
|
se.sessionVars.PartitionPruneMode.Store(prePruneMode)
|
|
se.sessionVars.OptimizerUseInvisibleIndexes = false
|
|
se.sessionVars.InspectionTableCache = nil
|
|
s.sysSessionPool().Put(tmp)
|
|
}, nil
|
|
}
|
|
|
|
func (s *session) withRestrictedSQLExecutor(ctx context.Context, opts []sqlexec.OptionFuncAlias, fn func(context.Context, *session) ([]chunk.Row, []*ast.ResultField, error)) ([]chunk.Row, []*ast.ResultField, error) {
|
|
execOption := sqlexec.GetExecOption(opts)
|
|
var se *session
|
|
var clean func()
|
|
var err error
|
|
if execOption.UseCurSession {
|
|
se, clean, err = s.useCurrentSession(execOption)
|
|
} else {
|
|
se, clean, err = s.getInternalSession(execOption)
|
|
}
|
|
if err != nil {
|
|
return nil, nil, errors.Trace(err)
|
|
}
|
|
defer clean()
|
|
if execOption.TrackSysProcID > 0 {
|
|
err = execOption.TrackSysProc(execOption.TrackSysProcID, se)
|
|
if err != nil {
|
|
return nil, nil, errors.Trace(err)
|
|
}
|
|
// unTrack should be called before clean (return sys session)
|
|
defer execOption.UnTrackSysProc(execOption.TrackSysProcID)
|
|
}
|
|
return fn(ctx, se)
|
|
}
|
|
|
|
func (s *session) ExecRestrictedSQL(ctx context.Context, opts []sqlexec.OptionFuncAlias, sql string, params ...interface{}) ([]chunk.Row, []*ast.ResultField, error) {
|
|
return s.withRestrictedSQLExecutor(ctx, opts, func(ctx context.Context, se *session) ([]chunk.Row, []*ast.ResultField, error) {
|
|
stmt, err := se.ParseWithParams(ctx, sql, params...)
|
|
if err != nil {
|
|
return nil, nil, errors.Trace(err)
|
|
}
|
|
defer pprof.SetGoroutineLabels(ctx)
|
|
startTime := time.Now()
|
|
metrics.SessionRestrictedSQLCounter.Inc()
|
|
ctx = context.WithValue(ctx, execdetails.StmtExecDetailKey, &execdetails.StmtExecDetails{})
|
|
ctx = context.WithValue(ctx, tikvutil.ExecDetailsKey, &tikvutil.ExecDetails{})
|
|
rs, err := se.ExecuteStmt(ctx, stmt)
|
|
if err != nil {
|
|
se.sessionVars.StmtCtx.AppendError(err)
|
|
}
|
|
if rs == nil {
|
|
return nil, nil, err
|
|
}
|
|
defer func() {
|
|
if closeErr := rs.Close(); closeErr != nil {
|
|
err = closeErr
|
|
}
|
|
}()
|
|
var rows []chunk.Row
|
|
rows, err = drainRecordSet(ctx, se, rs, nil)
|
|
if err != nil {
|
|
return nil, nil, err
|
|
}
|
|
metrics.QueryDurationHistogram.WithLabelValues(metrics.LblInternal).Observe(time.Since(startTime).Seconds())
|
|
return rows, rs.Fields(), err
|
|
})
|
|
}
|
|
|
|
func (s *session) ExecuteStmt(ctx context.Context, stmtNode ast.StmtNode) (sqlexec.RecordSet, error) {
|
|
if span := opentracing.SpanFromContext(ctx); span != nil && span.Tracer() != nil {
|
|
span1 := span.Tracer().StartSpan("session.ExecuteStmt", opentracing.ChildOf(span.Context()))
|
|
defer span1.Finish()
|
|
ctx = opentracing.ContextWithSpan(ctx, span1)
|
|
}
|
|
|
|
if err := s.PrepareTxnCtx(ctx); err != nil {
|
|
return nil, err
|
|
}
|
|
|
|
if err := s.loadCommonGlobalVariablesIfNeeded(); err != nil {
|
|
return nil, err
|
|
}
|
|
|
|
s.sessionVars.StartTime = time.Now()
|
|
|
|
// Some executions are done in compile stage, so we reset them before compile.
|
|
if err := executor.ResetContextOfStmt(s, stmtNode); err != nil {
|
|
return nil, err
|
|
}
|
|
normalizedSQL, digest := s.sessionVars.StmtCtx.SQLDigest()
|
|
if topsqlstate.TopSQLEnabled() {
|
|
s.sessionVars.StmtCtx.IsSQLRegistered.Store(true)
|
|
ctx = topsql.AttachAndRegisterSQLInfo(ctx, normalizedSQL, digest, s.sessionVars.InRestrictedSQL)
|
|
}
|
|
|
|
if err := s.validateStatementReadOnlyInStaleness(stmtNode); err != nil {
|
|
return nil, err
|
|
}
|
|
|
|
// Uncorrelated subqueries will execute once when building plan, so we reset process info before building plan.
|
|
cmd32 := atomic.LoadUint32(&s.GetSessionVars().CommandValue)
|
|
s.SetProcessInfo(stmtNode.Text(), time.Now(), byte(cmd32), 0)
|
|
s.txn.onStmtStart(digest.String())
|
|
defer s.txn.onStmtEnd()
|
|
|
|
if err := s.onTxnManagerStmtStartOrRetry(ctx, stmtNode); err != nil {
|
|
return nil, err
|
|
}
|
|
|
|
failpoint.Inject("mockStmtSlow", func(val failpoint.Value) {
|
|
if strings.Contains(stmtNode.Text(), "/* sleep */") {
|
|
v, _ := val.(int)
|
|
time.Sleep(time.Duration(v) * time.Millisecond)
|
|
}
|
|
})
|
|
|
|
stmtLabel := executor.GetStmtLabel(stmtNode)
|
|
s.setRequestSource(ctx, stmtLabel, stmtNode)
|
|
|
|
// Transform abstract syntax tree to a physical plan(stored in executor.ExecStmt).
|
|
compiler := executor.Compiler{Ctx: s}
|
|
stmt, err := compiler.Compile(ctx, stmtNode)
|
|
if err == nil {
|
|
err = sessiontxn.OptimizeWithPlanAndThenWarmUp(s, stmt.Plan)
|
|
}
|
|
|
|
if err != nil {
|
|
s.rollbackOnError(ctx)
|
|
|
|
// Only print log message when this SQL is from the user.
|
|
// Mute the warning for internal SQLs.
|
|
if !s.sessionVars.InRestrictedSQL {
|
|
if !variable.ErrUnknownSystemVar.Equal(err) {
|
|
logutil.Logger(ctx).Warn("compile SQL failed", zap.Error(err),
|
|
zap.String("SQL", stmtNode.Text()))
|
|
}
|
|
}
|
|
return nil, err
|
|
}
|
|
|
|
durCompile := time.Since(s.sessionVars.StartTime)
|
|
s.GetSessionVars().DurationCompile = durCompile
|
|
if s.isInternal() {
|
|
sessionExecuteCompileDurationInternal.Observe(durCompile.Seconds())
|
|
} else {
|
|
sessionExecuteCompileDurationGeneral.Observe(durCompile.Seconds())
|
|
}
|
|
s.currentPlan = stmt.Plan
|
|
|
|
// Execute the physical plan.
|
|
logStmt(stmt, s)
|
|
|
|
var recordSet sqlexec.RecordSet
|
|
if stmt.PsStmt != nil { // point plan short path
|
|
recordSet, err = stmt.PointGet(ctx)
|
|
s.txn.changeToInvalid()
|
|
} else {
|
|
recordSet, err = runStmt(ctx, s, stmt)
|
|
}
|
|
|
|
if err != nil {
|
|
if !errIsNoisy(err) {
|
|
logutil.Logger(ctx).Warn("run statement failed",
|
|
zap.Int64("schemaVersion", s.GetInfoSchema().SchemaMetaVersion()),
|
|
zap.Error(err),
|
|
zap.String("session", s.String()))
|
|
}
|
|
return recordSet, err
|
|
}
|
|
if !s.isInternal() && config.GetGlobalConfig().EnableTelemetry {
|
|
telemetry.CurrentExecuteCount.Inc()
|
|
tiFlashPushDown, tiFlashExchangePushDown := plannercore.IsTiFlashContained(stmt.Plan)
|
|
if tiFlashPushDown {
|
|
telemetry.CurrentTiFlashPushDownCount.Inc()
|
|
}
|
|
if tiFlashExchangePushDown {
|
|
telemetry.CurrentTiFlashExchangePushDownCount.Inc()
|
|
}
|
|
}
|
|
return recordSet, nil
|
|
}
|
|
|
|
func (s *session) onTxnManagerStmtStartOrRetry(ctx context.Context, node ast.StmtNode) error {
|
|
if s.sessionVars.RetryInfo.Retrying {
|
|
return sessiontxn.GetTxnManager(s).OnStmtRetry(ctx)
|
|
}
|
|
return sessiontxn.GetTxnManager(s).OnStmtStart(ctx, node)
|
|
}
|
|
|
|
func (s *session) validateStatementReadOnlyInStaleness(stmtNode ast.StmtNode) error {
|
|
vars := s.GetSessionVars()
|
|
if !vars.TxnCtx.IsStaleness && vars.TxnReadTS.PeakTxnReadTS() == 0 {
|
|
return nil
|
|
}
|
|
errMsg := "only support read-only statement during read-only staleness transactions"
|
|
node := stmtNode.(ast.Node)
|
|
switch v := node.(type) {
|
|
case *ast.SplitRegionStmt:
|
|
return nil
|
|
case *ast.SelectStmt:
|
|
// select lock statement needs start a transaction which will be conflict to stale read,
|
|
// we forbid select lock statement in stale read for now.
|
|
if v.LockInfo != nil {
|
|
return errors.New("select lock hasn't been supported in stale read yet")
|
|
}
|
|
if !planner.IsReadOnly(stmtNode, vars) {
|
|
return errors.New(errMsg)
|
|
}
|
|
return nil
|
|
case *ast.ExplainStmt, *ast.DoStmt, *ast.ShowStmt, *ast.SetOprStmt, *ast.ExecuteStmt, *ast.SetOprSelectList:
|
|
if !planner.IsReadOnly(stmtNode, vars) {
|
|
return errors.New(errMsg)
|
|
}
|
|
return nil
|
|
default:
|
|
}
|
|
// covered DeleteStmt/InsertStmt/UpdateStmt/CallStmt/LoadDataStmt
|
|
if _, ok := stmtNode.(ast.DMLNode); ok {
|
|
return errors.New(errMsg)
|
|
}
|
|
return nil
|
|
}
|
|
|
|
// querySpecialKeys contains the keys of special query, the special query will handled by handleQuerySpecial method.
|
|
var querySpecialKeys = []fmt.Stringer{
|
|
executor.LoadDataVarKey,
|
|
executor.LoadStatsVarKey,
|
|
executor.IndexAdviseVarKey,
|
|
executor.PlanReplayerLoadVarKey,
|
|
}
|
|
|
|
func (s *session) hasQuerySpecial() bool {
|
|
found := false
|
|
s.mu.RLock()
|
|
for _, k := range querySpecialKeys {
|
|
v := s.mu.values[k]
|
|
if v != nil {
|
|
found = true
|
|
break
|
|
}
|
|
}
|
|
s.mu.RUnlock()
|
|
return found
|
|
}
|
|
|
|
// runStmt executes the sqlexec.Statement and commit or rollback the current transaction.
|
|
func runStmt(ctx context.Context, se *session, s sqlexec.Statement) (rs sqlexec.RecordSet, err error) {
|
|
failpoint.Inject("assertTxnManagerInRunStmt", func() {
|
|
sessiontxn.RecordAssert(se, "assertTxnManagerInRunStmt", true)
|
|
if stmt, ok := s.(*executor.ExecStmt); ok {
|
|
sessiontxn.AssertTxnManagerInfoSchema(se, stmt.InfoSchema)
|
|
}
|
|
})
|
|
|
|
if span := opentracing.SpanFromContext(ctx); span != nil && span.Tracer() != nil {
|
|
span1 := span.Tracer().StartSpan("session.runStmt", opentracing.ChildOf(span.Context()))
|
|
span1.LogKV("sql", s.OriginText())
|
|
defer span1.Finish()
|
|
ctx = opentracing.ContextWithSpan(ctx, span1)
|
|
}
|
|
se.SetValue(sessionctx.QueryString, s.OriginText())
|
|
if _, ok := s.(*executor.ExecStmt).StmtNode.(ast.DDLNode); ok {
|
|
se.SetValue(sessionctx.LastExecuteDDL, true)
|
|
} else {
|
|
se.ClearValue(sessionctx.LastExecuteDDL)
|
|
}
|
|
|
|
sessVars := se.sessionVars
|
|
|
|
// Record diagnostic information for DML statements
|
|
if stmt, ok := s.(*executor.ExecStmt).StmtNode.(ast.DMLNode); ok {
|
|
// Keep the previous queryInfo for `show session_states` because the statement needs to encode it.
|
|
if showStmt, ok := stmt.(*ast.ShowStmt); !ok || showStmt.Tp != ast.ShowSessionStates {
|
|
defer func() {
|
|
sessVars.LastQueryInfo = sessionstates.QueryInfo{
|
|
TxnScope: sessVars.CheckAndGetTxnScope(),
|
|
StartTS: sessVars.TxnCtx.StartTS,
|
|
ForUpdateTS: sessVars.TxnCtx.GetForUpdateTS(),
|
|
}
|
|
if err != nil {
|
|
sessVars.LastQueryInfo.ErrMsg = err.Error()
|
|
}
|
|
}()
|
|
}
|
|
}
|
|
|
|
// Save origTxnCtx here to avoid it reset in the transaction retry.
|
|
origTxnCtx := sessVars.TxnCtx
|
|
err = se.checkTxnAborted(s)
|
|
if err != nil {
|
|
return nil, err
|
|
}
|
|
|
|
rs, err = s.Exec(ctx)
|
|
se.updateTelemetryMetric(s.(*executor.ExecStmt))
|
|
sessVars.TxnCtx.StatementCount++
|
|
if rs != nil {
|
|
return &execStmtResult{
|
|
RecordSet: rs,
|
|
sql: s,
|
|
se: se,
|
|
}, err
|
|
}
|
|
|
|
err = finishStmt(ctx, se, err, s)
|
|
if se.hasQuerySpecial() {
|
|
// The special query will be handled later in handleQuerySpecial,
|
|
// then should call the ExecStmt.FinishExecuteStmt to finish this statement.
|
|
se.SetValue(ExecStmtVarKey, s.(*executor.ExecStmt))
|
|
} else {
|
|
// If it is not a select statement or special query, we record its slow log here,
|
|
// then it could include the transaction commit time.
|
|
s.(*executor.ExecStmt).FinishExecuteStmt(origTxnCtx.StartTS, err, false)
|
|
}
|
|
return nil, err
|
|
}
|
|
|
|
// ExecStmtVarKeyType is a dummy type to avoid naming collision in context.
|
|
type ExecStmtVarKeyType int
|
|
|
|
// String defines a Stringer function for debugging and pretty printing.
|
|
func (k ExecStmtVarKeyType) String() string {
|
|
return "exec_stmt_var_key"
|
|
}
|
|
|
|
// ExecStmtVarKey is a variable key for ExecStmt.
|
|
const ExecStmtVarKey ExecStmtVarKeyType = 0
|
|
|
|
// execStmtResult is the return value of ExecuteStmt and it implements the sqlexec.RecordSet interface.
|
|
// Why we need a struct to wrap a RecordSet and provide another RecordSet?
|
|
// This is because there are so many session state related things that definitely not belongs to the original
|
|
// RecordSet, so this struct exists and RecordSet.Close() is overrided handle that.
|
|
type execStmtResult struct {
|
|
sqlexec.RecordSet
|
|
se *session
|
|
sql sqlexec.Statement
|
|
}
|
|
|
|
func (rs *execStmtResult) Close() error {
|
|
se := rs.se
|
|
if err := rs.RecordSet.Close(); err != nil {
|
|
return finishStmt(context.Background(), se, err, rs.sql)
|
|
}
|
|
if err := resetCTEStorageMap(se); err != nil {
|
|
return finishStmt(context.Background(), se, err, rs.sql)
|
|
}
|
|
return finishStmt(context.Background(), se, nil, rs.sql)
|
|
}
|
|
|
|
func resetCTEStorageMap(se *session) error {
|
|
tmp := se.GetSessionVars().StmtCtx.CTEStorageMap
|
|
if tmp == nil {
|
|
// Close() is already called, so no need to reset. Such as TraceExec.
|
|
return nil
|
|
}
|
|
storageMap, ok := tmp.(map[int]*executor.CTEStorages)
|
|
if !ok {
|
|
return errors.New("type assertion for CTEStorageMap failed")
|
|
}
|
|
for _, v := range storageMap {
|
|
v.ResTbl.Lock()
|
|
err1 := v.ResTbl.DerefAndClose()
|
|
// Make sure we do not hold the lock for longer than necessary.
|
|
v.ResTbl.Unlock()
|
|
// No need to lock IterInTbl.
|
|
err2 := v.IterInTbl.DerefAndClose()
|
|
if err1 != nil {
|
|
return err1
|
|
}
|
|
if err2 != nil {
|
|
return err2
|
|
}
|
|
}
|
|
se.GetSessionVars().StmtCtx.CTEStorageMap = nil
|
|
return nil
|
|
}
|
|
|
|
// rollbackOnError makes sure the next statement starts a new transaction with the latest InfoSchema.
|
|
func (s *session) rollbackOnError(ctx context.Context) {
|
|
if !s.sessionVars.InTxn() {
|
|
s.RollbackTxn(ctx)
|
|
}
|
|
}
|
|
|
|
// CacheGeneralStmt parses the sql, generates the corresponding PlanCacheStmt and cache it.
|
|
// The sql have to be parameterized, e.g. select * from t where a>?.
|
|
func (s *session) CacheGeneralStmt(sql string) (interface{}, error) {
|
|
if stmt := s.sessionVars.GetGeneralPlanCacheStmt(sql); stmt != nil {
|
|
// skip this step if there is already a PlanCacheStmt for this ql
|
|
return stmt, nil
|
|
}
|
|
|
|
prepareExec := executor.NewPrepareExec(s, sql)
|
|
prepareExec.IsGeneralStmt = true
|
|
if err := prepareExec.Next(context.Background(), nil); err != nil {
|
|
return nil, err
|
|
}
|
|
return prepareExec.Stmt, nil
|
|
}
|
|
|
|
// PrepareStmt is used for executing prepare statement in binary protocol
|
|
func (s *session) PrepareStmt(sql string) (stmtID uint32, paramCount int, fields []*ast.ResultField, err error) {
|
|
if s.sessionVars.TxnCtx.InfoSchema == nil {
|
|
// We don't need to create a transaction for prepare statement, just get information schema will do.
|
|
s.sessionVars.TxnCtx.InfoSchema = domain.GetDomain(s).InfoSchema()
|
|
}
|
|
err = s.loadCommonGlobalVariablesIfNeeded()
|
|
if err != nil {
|
|
return
|
|
}
|
|
|
|
ctx := context.Background()
|
|
inTxn := s.GetSessionVars().InTxn()
|
|
// NewPrepareExec may need startTS to build the executor, for example prepare statement has subquery in int.
|
|
// So we have to call PrepareTxnCtx here.
|
|
if err = s.PrepareTxnCtx(ctx); err != nil {
|
|
return
|
|
}
|
|
|
|
prepareStmt := &ast.PrepareStmt{SQLText: sql}
|
|
if err = s.onTxnManagerStmtStartOrRetry(ctx, prepareStmt); err != nil {
|
|
return
|
|
}
|
|
|
|
if err = sessiontxn.GetTxnManager(s).AdviseWarmup(); err != nil {
|
|
return
|
|
}
|
|
prepareExec := executor.NewPrepareExec(s, sql)
|
|
err = prepareExec.Next(ctx, nil)
|
|
if err != nil {
|
|
return
|
|
}
|
|
if !inTxn {
|
|
// We could start a transaction to build the prepare executor before, we should rollback it here.
|
|
s.RollbackTxn(ctx)
|
|
}
|
|
return prepareExec.ID, prepareExec.ParamCount, prepareExec.Fields, nil
|
|
}
|
|
|
|
func (s *session) preparedStmtExec(ctx context.Context, execStmt *ast.ExecuteStmt, prepareStmt *plannercore.PlanCacheStmt) (sqlexec.RecordSet, error) {
|
|
failpoint.Inject("assertTxnManagerInPreparedStmtExec", func() {
|
|
sessiontxn.RecordAssert(s, "assertTxnManagerInPreparedStmtExec", true)
|
|
if prepareStmt.SnapshotTSEvaluator != nil {
|
|
staleread.AssertStmtStaleness(s, true)
|
|
ts, err := prepareStmt.SnapshotTSEvaluator(s)
|
|
if err != nil {
|
|
panic(err)
|
|
}
|
|
sessiontxn.AssertTxnManagerReadTS(s, ts)
|
|
}
|
|
})
|
|
|
|
s.sessionVars.StartTime = time.Now()
|
|
preparedObj, err := plannercore.GetPreparedStmt(execStmt, s.GetSessionVars())
|
|
if err != nil {
|
|
return nil, err
|
|
}
|
|
|
|
compiler := executor.Compiler{Ctx: s}
|
|
stmt, err := compiler.Compile(ctx, execStmt)
|
|
if err == nil {
|
|
err = sessiontxn.OptimizeWithPlanAndThenWarmUp(s, stmt.Plan)
|
|
}
|
|
if err != nil {
|
|
return nil, err
|
|
}
|
|
durCompile := time.Since(s.sessionVars.StartTime)
|
|
s.GetSessionVars().DurationCompile = durCompile
|
|
|
|
stmtCtx := s.GetSessionVars().StmtCtx
|
|
stmt.Text = preparedObj.PreparedAst.Stmt.Text()
|
|
stmtCtx.OriginalSQL = stmt.Text
|
|
stmtCtx.InitSQLDigest(preparedObj.NormalizedSQL, preparedObj.SQLDigest)
|
|
|
|
if !s.isInternal() && config.GetGlobalConfig().EnableTelemetry {
|
|
tiFlashPushDown, tiFlashExchangePushDown := plannercore.IsTiFlashContained(stmt.Plan)
|
|
telemetry.CurrentExecuteCount.Inc()
|
|
if tiFlashPushDown {
|
|
telemetry.CurrentTiFlashPushDownCount.Inc()
|
|
}
|
|
if tiFlashExchangePushDown {
|
|
telemetry.CurrentTiFlashExchangePushDownCount.Inc()
|
|
}
|
|
}
|
|
sessionExecuteCompileDurationGeneral.Observe(time.Since(s.sessionVars.StartTime).Seconds())
|
|
logGeneralQuery(stmt, s, true)
|
|
|
|
var recordSet sqlexec.RecordSet
|
|
|
|
if stmt.PsStmt != nil { // point plan short path
|
|
recordSet, err = stmt.PointGet(ctx)
|
|
s.txn.changeToInvalid()
|
|
} else {
|
|
recordSet, err = runStmt(ctx, s, stmt)
|
|
}
|
|
return recordSet, err
|
|
}
|
|
|
|
// ExecutePreparedStmt executes a prepared statement.
|
|
func (s *session) ExecutePreparedStmt(ctx context.Context, stmtID uint32, params []expression.Expression) (sqlexec.RecordSet, error) {
|
|
prepStmt, err := s.sessionVars.GetPreparedStmtByID(stmtID)
|
|
if err != nil {
|
|
err = plannercore.ErrStmtNotFound
|
|
logutil.Logger(ctx).Error("prepared statement not found", zap.Uint32("stmtID", stmtID))
|
|
return nil, err
|
|
}
|
|
stmt, ok := prepStmt.(*plannercore.PlanCacheStmt)
|
|
if !ok {
|
|
return nil, errors.Errorf("invalid PlanCacheStmt type")
|
|
}
|
|
return s.executePlanCacheStmt(ctx, stmt, params)
|
|
}
|
|
|
|
// ExecuteGeneralStmt executes a general statement.
|
|
func (s *session) ExecuteGeneralStmt(ctx context.Context, sql string, params []expression.Expression) (sqlexec.RecordSet, error) {
|
|
generalStmt := s.sessionVars.GetGeneralPlanCacheStmt(sql)
|
|
if generalStmt == nil {
|
|
err := plannercore.ErrStmtNotFound
|
|
logutil.Logger(ctx).Error("general statement not found", zap.String("sql", sql))
|
|
return nil, err
|
|
}
|
|
stmt, ok := generalStmt.(*plannercore.PlanCacheStmt)
|
|
if !ok {
|
|
return nil, errors.Errorf("invalid PlanCacheStmt type")
|
|
}
|
|
return s.executePlanCacheStmt(ctx, stmt, params)
|
|
}
|
|
|
|
func (s *session) executePlanCacheStmt(ctx context.Context, stmt *plannercore.PlanCacheStmt, params []expression.Expression) (sqlexec.RecordSet, error) {
|
|
var err error
|
|
if err = s.PrepareTxnCtx(ctx); err != nil {
|
|
return nil, err
|
|
}
|
|
|
|
s.sessionVars.StartTime = time.Now()
|
|
execStmt := &ast.ExecuteStmt{PrepStmt: stmt, BinaryArgs: params}
|
|
if err := executor.ResetContextOfStmt(s, execStmt); err != nil {
|
|
return nil, err
|
|
}
|
|
|
|
staleReadProcessor := staleread.NewStaleReadProcessor(s)
|
|
if err = staleReadProcessor.OnExecutePreparedStmt(stmt.SnapshotTSEvaluator); err != nil {
|
|
return nil, err
|
|
}
|
|
|
|
if staleReadProcessor.IsStaleness() {
|
|
s.sessionVars.StmtCtx.IsStaleness = true
|
|
err = sessiontxn.GetTxnManager(s).EnterNewTxn(ctx, &sessiontxn.EnterNewTxnRequest{
|
|
Type: sessiontxn.EnterNewTxnWithReplaceProvider,
|
|
Provider: staleread.NewStalenessTxnContextProvider(
|
|
s,
|
|
staleReadProcessor.GetStalenessReadTS(),
|
|
staleReadProcessor.GetStalenessInfoSchema(),
|
|
),
|
|
})
|
|
|
|
if err != nil {
|
|
return nil, err
|
|
}
|
|
}
|
|
|
|
s.txn.onStmtStart(stmt.SQLDigest.String())
|
|
defer s.txn.onStmtEnd()
|
|
|
|
if err = s.onTxnManagerStmtStartOrRetry(ctx, execStmt); err != nil {
|
|
return nil, err
|
|
}
|
|
s.setRequestSource(ctx, stmt.PreparedAst.StmtType, stmt.PreparedAst.Stmt)
|
|
// even the txn is valid, still need to set session variable for coprocessor usage.
|
|
s.sessionVars.RequestSourceType = stmt.PreparedAst.StmtType
|
|
return s.preparedStmtExec(ctx, execStmt, stmt)
|
|
}
|
|
|
|
func (s *session) DropPreparedStmt(stmtID uint32) error {
|
|
vars := s.sessionVars
|
|
if _, ok := vars.PreparedStmts[stmtID]; !ok {
|
|
return plannercore.ErrStmtNotFound
|
|
}
|
|
vars.RetryInfo.DroppedPreparedStmtIDs = append(vars.RetryInfo.DroppedPreparedStmtIDs, stmtID)
|
|
return nil
|
|
}
|
|
|
|
func (s *session) Txn(active bool) (kv.Transaction, error) {
|
|
if !active {
|
|
return &s.txn, nil
|
|
}
|
|
_, err := sessiontxn.GetTxnManager(s).ActivateTxn()
|
|
return &s.txn, err
|
|
}
|
|
|
|
func (s *session) SetValue(key fmt.Stringer, value interface{}) {
|
|
s.mu.Lock()
|
|
s.mu.values[key] = value
|
|
s.mu.Unlock()
|
|
}
|
|
|
|
func (s *session) Value(key fmt.Stringer) interface{} {
|
|
s.mu.RLock()
|
|
value := s.mu.values[key]
|
|
s.mu.RUnlock()
|
|
return value
|
|
}
|
|
|
|
func (s *session) ClearValue(key fmt.Stringer) {
|
|
s.mu.Lock()
|
|
delete(s.mu.values, key)
|
|
s.mu.Unlock()
|
|
}
|
|
|
|
type inCloseSession struct{}
|
|
|
|
// Close function does some clean work when session end.
|
|
// Close should release the table locks which hold by the session.
|
|
func (s *session) Close() {
|
|
// TODO: do clean table locks when session exited without execute Close.
|
|
// TODO: do clean table locks when tidb-server was `kill -9`.
|
|
if s.HasLockedTables() && config.TableLockEnabled() {
|
|
if ds := config.TableLockDelayClean(); ds > 0 {
|
|
time.Sleep(time.Duration(ds) * time.Millisecond)
|
|
}
|
|
lockedTables := s.GetAllTableLocks()
|
|
err := domain.GetDomain(s).DDL().UnlockTables(s, lockedTables)
|
|
if err != nil {
|
|
logutil.BgLogger().Error("release table lock failed", zap.Uint64("conn", s.sessionVars.ConnectionID))
|
|
}
|
|
}
|
|
s.ReleaseAllAdvisoryLocks()
|
|
if s.statsCollector != nil {
|
|
s.statsCollector.Delete()
|
|
}
|
|
if s.idxUsageCollector != nil {
|
|
s.idxUsageCollector.Delete()
|
|
}
|
|
telemetry.GlobalBuiltinFunctionsUsage.Collect(s.GetBuiltinFunctionUsage())
|
|
bindValue := s.Value(bindinfo.SessionBindInfoKeyType)
|
|
if bindValue != nil {
|
|
bindValue.(*bindinfo.SessionHandle).Close()
|
|
}
|
|
ctx := context.WithValue(context.TODO(), inCloseSession{}, struct{}{})
|
|
s.RollbackTxn(ctx)
|
|
if s.sessionVars != nil {
|
|
s.sessionVars.WithdrawAllPreparedStmt()
|
|
}
|
|
if s.stmtStats != nil {
|
|
s.stmtStats.SetFinished()
|
|
}
|
|
s.ClearDiskFullOpt()
|
|
}
|
|
|
|
// GetSessionVars implements the context.Context interface.
|
|
func (s *session) GetSessionVars() *variable.SessionVars {
|
|
return s.sessionVars
|
|
}
|
|
|
|
func (s *session) AuthPluginForUser(user *auth.UserIdentity) (string, error) {
|
|
pm := privilege.GetPrivilegeManager(s)
|
|
authplugin, err := pm.GetAuthPlugin(user.Username, user.Hostname)
|
|
if err != nil {
|
|
return "", err
|
|
}
|
|
return authplugin, nil
|
|
}
|
|
|
|
// Auth validates a user using an authentication string and salt.
|
|
// If the password fails, it will keep trying other users until exhausted.
|
|
// This means it can not be refactored to use MatchIdentity yet.
|
|
func (s *session) Auth(user *auth.UserIdentity, authentication []byte, salt []byte) error {
|
|
hasPassword := "YES"
|
|
if len(authentication) == 0 {
|
|
hasPassword = "NO"
|
|
}
|
|
pm := privilege.GetPrivilegeManager(s)
|
|
authUser, err := s.MatchIdentity(user.Username, user.Hostname)
|
|
if err != nil {
|
|
return dbterror.ClassSession.NewStd(mysql.ErrAccessDenied).FastGenByArgs(user.Username, user.Hostname, hasPassword)
|
|
}
|
|
if err = pm.ConnectionVerification(user, authUser.Username, authUser.Hostname, authentication, salt, s.sessionVars.TLSConnectionState); err != nil {
|
|
return err
|
|
}
|
|
user.AuthUsername = authUser.Username
|
|
user.AuthHostname = authUser.Hostname
|
|
s.sessionVars.User = user
|
|
s.sessionVars.ActiveRoles = pm.GetDefaultRoles(user.AuthUsername, user.AuthHostname)
|
|
return nil
|
|
}
|
|
|
|
// MatchIdentity finds the matching username + password in the MySQL privilege tables
|
|
// for a username + hostname, since MySQL can have wildcards.
|
|
func (s *session) MatchIdentity(username, remoteHost string) (*auth.UserIdentity, error) {
|
|
pm := privilege.GetPrivilegeManager(s)
|
|
var success bool
|
|
var skipNameResolve bool
|
|
var user = &auth.UserIdentity{}
|
|
varVal, err := s.GetSessionVars().GlobalVarsAccessor.GetGlobalSysVar(variable.SkipNameResolve)
|
|
if err == nil && variable.TiDBOptOn(varVal) {
|
|
skipNameResolve = true
|
|
}
|
|
user.Username, user.Hostname, success = pm.MatchIdentity(username, remoteHost, skipNameResolve)
|
|
if success {
|
|
return user, nil
|
|
}
|
|
// This error will not be returned to the user, access denied will be instead
|
|
return nil, fmt.Errorf("could not find matching user in MatchIdentity: %s, %s", username, remoteHost)
|
|
}
|
|
|
|
// AuthWithoutVerification is required by the ResetConnection RPC
|
|
func (s *session) AuthWithoutVerification(user *auth.UserIdentity) bool {
|
|
pm := privilege.GetPrivilegeManager(s)
|
|
authUser, err := s.MatchIdentity(user.Username, user.Hostname)
|
|
if err != nil {
|
|
return false
|
|
}
|
|
if pm.GetAuthWithoutVerification(authUser.Username, authUser.Hostname) {
|
|
user.AuthUsername = authUser.Username
|
|
user.AuthHostname = authUser.Hostname
|
|
s.sessionVars.User = user
|
|
s.sessionVars.ActiveRoles = pm.GetDefaultRoles(user.AuthUsername, user.AuthHostname)
|
|
return true
|
|
}
|
|
return false
|
|
}
|
|
|
|
// RefreshVars implements the sessionctx.Context interface.
|
|
func (s *session) RefreshVars(ctx context.Context) error {
|
|
pruneMode, err := s.GetSessionVars().GlobalVarsAccessor.GetGlobalSysVar(variable.TiDBPartitionPruneMode)
|
|
if err != nil {
|
|
return err
|
|
}
|
|
s.sessionVars.PartitionPruneMode.Store(pruneMode)
|
|
return nil
|
|
}
|
|
|
|
// SetSessionStatesHandler implements the Session.SetSessionStatesHandler interface.
|
|
func (s *session) SetSessionStatesHandler(stateType sessionstates.SessionStateType, handler sessionctx.SessionStatesHandler) {
|
|
s.sessionStatesHandlers[stateType] = handler
|
|
}
|
|
|
|
// CreateSession4Test creates a new session environment for test.
|
|
func CreateSession4Test(store kv.Storage) (Session, error) {
|
|
se, err := CreateSession4TestWithOpt(store, nil)
|
|
if err == nil {
|
|
// Cover both chunk rpc encoding and default encoding.
|
|
// nolint:gosec
|
|
if rand.Intn(2) == 0 {
|
|
se.GetSessionVars().EnableChunkRPC = false
|
|
} else {
|
|
se.GetSessionVars().EnableChunkRPC = true
|
|
}
|
|
}
|
|
return se, err
|
|
}
|
|
|
|
// Opt describes the option for creating session
|
|
type Opt struct {
|
|
PreparedPlanCache *kvcache.SimpleLRUCache
|
|
}
|
|
|
|
// CreateSession4TestWithOpt creates a new session environment for test.
|
|
func CreateSession4TestWithOpt(store kv.Storage, opt *Opt) (Session, error) {
|
|
s, err := CreateSessionWithOpt(store, opt)
|
|
if err == nil {
|
|
// initialize session variables for test.
|
|
s.GetSessionVars().InitChunkSize = 2
|
|
s.GetSessionVars().MaxChunkSize = 32
|
|
s.GetSessionVars().MinPagingSize = variable.DefMinPagingSize
|
|
s.GetSessionVars().EnablePaging = variable.DefTiDBEnablePaging
|
|
err = s.GetSessionVars().SetSystemVarWithoutValidation(variable.CharacterSetConnection, "utf8mb4")
|
|
}
|
|
return s, err
|
|
}
|
|
|
|
// CreateSession creates a new session environment.
|
|
func CreateSession(store kv.Storage) (Session, error) {
|
|
return CreateSessionWithOpt(store, nil)
|
|
}
|
|
|
|
// CreateSessionWithOpt creates a new session environment with option.
|
|
// Use default option if opt is nil.
|
|
func CreateSessionWithOpt(store kv.Storage, opt *Opt) (Session, error) {
|
|
s, err := createSessionWithOpt(store, opt)
|
|
if err != nil {
|
|
return nil, err
|
|
}
|
|
|
|
// Add auth here.
|
|
do, err := domap.Get(store)
|
|
if err != nil {
|
|
return nil, err
|
|
}
|
|
pm := &privileges.UserPrivileges{
|
|
Handle: do.PrivilegeHandle(),
|
|
}
|
|
privilege.BindPrivilegeManager(s, pm)
|
|
|
|
// Add stats collector, and it will be freed by background stats worker
|
|
// which periodically updates stats using the collected data.
|
|
if do.StatsHandle() != nil && do.StatsUpdating() {
|
|
s.statsCollector = do.StatsHandle().NewSessionStatsCollector()
|
|
if GetIndexUsageSyncLease() > 0 {
|
|
s.idxUsageCollector = do.StatsHandle().NewSessionIndexUsageCollector()
|
|
}
|
|
}
|
|
|
|
return s, nil
|
|
}
|
|
|
|
// loadCollationParameter loads collation parameter from mysql.tidb
|
|
func loadCollationParameter(ctx context.Context, se *session) (bool, error) {
|
|
para, err := se.getTableValue(ctx, mysql.TiDBTable, tidbNewCollationEnabled)
|
|
if err != nil {
|
|
return false, err
|
|
}
|
|
if para == varTrue {
|
|
return true, nil
|
|
} else if para == varFalse {
|
|
return false, nil
|
|
}
|
|
logutil.BgLogger().Warn(
|
|
"Unexpected value of 'new_collation_enabled' in 'mysql.tidb', use 'False' instead",
|
|
zap.String("value", para))
|
|
return false, nil
|
|
}
|
|
|
|
var (
|
|
errResultIsEmpty = dbterror.ClassExecutor.NewStd(errno.ErrResultIsEmpty)
|
|
// DDLJobTables is a list of tables definitions used in concurrent DDL.
|
|
DDLJobTables = []struct {
|
|
SQL string
|
|
id int64
|
|
}{
|
|
{ddl.JobTableSQL, ddl.JobTableID},
|
|
{ddl.ReorgTableSQL, ddl.ReorgTableID},
|
|
{ddl.HistoryTableSQL, ddl.HistoryTableID},
|
|
}
|
|
)
|
|
|
|
// InitDDLJobTables is to create tidb_ddl_job, tidb_ddl_reorg and tidb_ddl_history.
|
|
func InitDDLJobTables(store kv.Storage) error {
|
|
return kv.RunInNewTxn(kv.WithInternalSourceType(context.Background(), kv.InternalTxnDDL), store, true, func(ctx context.Context, txn kv.Transaction) error {
|
|
t := meta.NewMeta(txn)
|
|
exists, err := t.CheckDDLTableExists()
|
|
if err != nil || exists {
|
|
return errors.Trace(err)
|
|
}
|
|
dbID, err := t.CreateMySQLDatabaseIfNotExists()
|
|
if err != nil {
|
|
return err
|
|
}
|
|
p := parser.New()
|
|
for _, tbl := range DDLJobTables {
|
|
id, err := t.GetGlobalID()
|
|
if err != nil {
|
|
return errors.Trace(err)
|
|
}
|
|
if id >= meta.MaxGlobalID {
|
|
return errors.Errorf("It is unreasonable that the global ID grows such a big value: %d, please concat TiDB team", id)
|
|
}
|
|
stmt, err := p.ParseOneStmt(tbl.SQL, "", "")
|
|
if err != nil {
|
|
return errors.Trace(err)
|
|
}
|
|
tblInfo, err := ddl.BuildTableInfoFromAST(stmt.(*ast.CreateTableStmt))
|
|
if err != nil {
|
|
return errors.Trace(err)
|
|
}
|
|
tblInfo.State = model.StatePublic
|
|
tblInfo.ID = tbl.id
|
|
tblInfo.UpdateTS = t.StartTS
|
|
if err != nil {
|
|
return errors.Trace(err)
|
|
}
|
|
err = t.CreateTableOrView(dbID, tblInfo)
|
|
if err != nil {
|
|
return errors.Trace(err)
|
|
}
|
|
}
|
|
return t.SetDDLTables()
|
|
})
|
|
}
|
|
|
|
// BootstrapSession runs the first time when the TiDB server start.
|
|
func BootstrapSession(store kv.Storage) (*domain.Domain, error) {
|
|
ctx := kv.WithInternalSourceType(context.Background(), kv.InternalTxnBootstrap)
|
|
cfg := config.GetGlobalConfig()
|
|
if len(cfg.Instance.PluginLoad) > 0 {
|
|
err := plugin.Load(context.Background(), plugin.Config{
|
|
Plugins: strings.Split(cfg.Instance.PluginLoad, ","),
|
|
PluginDir: cfg.Instance.PluginDir,
|
|
})
|
|
if err != nil {
|
|
return nil, err
|
|
}
|
|
}
|
|
err := InitDDLJobTables(store)
|
|
if err != nil {
|
|
return nil, err
|
|
}
|
|
ver := getStoreBootstrapVersion(store)
|
|
if ver == notBootstrapped {
|
|
runInBootstrapSession(store, bootstrap)
|
|
} else if ver < currentBootstrapVersion {
|
|
runInBootstrapSession(store, upgrade)
|
|
}
|
|
|
|
concurrency := int(config.GetGlobalConfig().Performance.StatsLoadConcurrency)
|
|
ses, err := createSessions(store, 7+concurrency)
|
|
if err != nil {
|
|
return nil, err
|
|
}
|
|
ses[0].GetSessionVars().InRestrictedSQL = true
|
|
|
|
// get system tz from mysql.tidb
|
|
tz, err := ses[0].getTableValue(ctx, mysql.TiDBTable, tidbSystemTZ)
|
|
if err != nil {
|
|
return nil, err
|
|
}
|
|
timeutil.SetSystemTZ(tz)
|
|
|
|
// get the flag from `mysql`.`tidb` which indicating if new collations are enabled.
|
|
newCollationEnabled, err := loadCollationParameter(ctx, ses[0])
|
|
if err != nil {
|
|
return nil, err
|
|
}
|
|
collate.SetNewCollationEnabledForTest(newCollationEnabled)
|
|
// To deal with the location partition failure caused by inconsistent NewCollationEnabled values(see issue #32416).
|
|
rebuildAllPartitionValueMapAndSorted(ses[0])
|
|
|
|
dom := domain.GetDomain(ses[0])
|
|
|
|
// We should make the load bind-info loop before other loops which has internal SQL.
|
|
// Because the internal SQL may access the global bind-info handler. As the result, the data race occurs here as the
|
|
// LoadBindInfoLoop inits global bind-info handler.
|
|
err = dom.LoadBindInfoLoop(ses[1], ses[2])
|
|
if err != nil {
|
|
return nil, err
|
|
}
|
|
|
|
if !config.GetGlobalConfig().Security.SkipGrantTable {
|
|
err = dom.LoadPrivilegeLoop(ses[3])
|
|
if err != nil {
|
|
return nil, err
|
|
}
|
|
}
|
|
|
|
// Rebuild sysvar cache in a loop
|
|
err = dom.LoadSysVarCacheLoop(ses[4])
|
|
if err != nil {
|
|
return nil, err
|
|
}
|
|
|
|
if len(cfg.Instance.PluginLoad) > 0 {
|
|
err := plugin.Init(context.Background(), plugin.Config{EtcdClient: dom.GetEtcdClient()})
|
|
if err != nil {
|
|
return nil, err
|
|
}
|
|
}
|
|
|
|
err = executor.LoadExprPushdownBlacklist(ses[5])
|
|
if err != nil {
|
|
return nil, err
|
|
}
|
|
err = executor.LoadOptRuleBlacklist(ctx, ses[5])
|
|
if err != nil {
|
|
return nil, err
|
|
}
|
|
|
|
if dom.GetEtcdClient() != nil {
|
|
// We only want telemetry data in production-like clusters. When TiDB is deployed over other engines,
|
|
// for example, unistore engine (used for local tests), we just skip it. Its etcd client is nil.
|
|
go func() {
|
|
dom.TelemetryReportLoop(ses[5])
|
|
dom.TelemetryRotateSubWindowLoop(ses[5])
|
|
}()
|
|
}
|
|
|
|
// A sub context for update table stats, and other contexts for concurrent stats loading.
|
|
cnt := 1 + concurrency
|
|
subCtxs := make([]sessionctx.Context, cnt)
|
|
for i := 0; i < cnt; i++ {
|
|
subCtxs[i] = sessionctx.Context(ses[6+i])
|
|
}
|
|
if err = dom.LoadAndUpdateStatsLoop(subCtxs); err != nil {
|
|
return nil, err
|
|
}
|
|
|
|
dom.DumpFileGcCheckerLoop()
|
|
dom.LoadSigningCertLoop()
|
|
|
|
if raw, ok := store.(kv.EtcdBackend); ok {
|
|
err = raw.StartGCWorker()
|
|
if err != nil {
|
|
return nil, err
|
|
}
|
|
}
|
|
|
|
return dom, err
|
|
}
|
|
|
|
// GetDomain gets the associated domain for store.
|
|
func GetDomain(store kv.Storage) (*domain.Domain, error) {
|
|
return domap.Get(store)
|
|
}
|
|
|
|
// runInBootstrapSession create a special session for bootstrap to run.
|
|
// If no bootstrap and storage is remote, we must use a little lease time to
|
|
// bootstrap quickly, after bootstrapped, we will reset the lease time.
|
|
// TODO: Using a bootstrap tool for doing this may be better later.
|
|
func runInBootstrapSession(store kv.Storage, bootstrap func(Session)) {
|
|
s, err := createSession(store)
|
|
if err != nil {
|
|
// Bootstrap fail will cause program exit.
|
|
logutil.BgLogger().Fatal("createSession error", zap.Error(err))
|
|
}
|
|
|
|
s.SetValue(sessionctx.Initing, true)
|
|
bootstrap(s)
|
|
finishBootstrap(store)
|
|
s.ClearValue(sessionctx.Initing)
|
|
|
|
dom := domain.GetDomain(s)
|
|
dom.Close()
|
|
domap.Delete(store)
|
|
}
|
|
|
|
func createSessions(store kv.Storage, cnt int) ([]*session, error) {
|
|
ses := make([]*session, cnt)
|
|
for i := 0; i < cnt; i++ {
|
|
se, err := createSession(store)
|
|
if err != nil {
|
|
return nil, err
|
|
}
|
|
ses[i] = se
|
|
}
|
|
|
|
return ses, nil
|
|
}
|
|
|
|
func createSession(store kv.Storage) (*session, error) {
|
|
return createSessionWithOpt(store, nil)
|
|
}
|
|
|
|
func createSessionWithOpt(store kv.Storage, opt *Opt) (*session, error) {
|
|
dom, err := domap.Get(store)
|
|
if err != nil {
|
|
return nil, err
|
|
}
|
|
s := &session{
|
|
store: store,
|
|
sessionVars: variable.NewSessionVars(),
|
|
ddlOwnerManager: dom.DDL().OwnerManager(),
|
|
client: store.GetClient(),
|
|
mppClient: store.GetMPPClient(),
|
|
stmtStats: stmtstats.CreateStatementStats(),
|
|
sessionStatesHandlers: make(map[sessionstates.SessionStateType]sessionctx.SessionStatesHandler),
|
|
}
|
|
s.functionUsageMu.builtinFunctionUsage = make(telemetry.BuiltinFunctionsUsage)
|
|
if opt != nil && opt.PreparedPlanCache != nil {
|
|
s.preparedPlanCache = opt.PreparedPlanCache
|
|
}
|
|
s.mu.values = make(map[fmt.Stringer]interface{})
|
|
s.lockedTables = make(map[int64]model.TableLockTpInfo)
|
|
s.advisoryLocks = make(map[string]*advisoryLock)
|
|
|
|
domain.BindDomain(s, dom)
|
|
// session implements variable.GlobalVarAccessor. Bind it to ctx.
|
|
s.sessionVars.GlobalVarsAccessor = s
|
|
s.sessionVars.BinlogClient = binloginfo.GetPumpsClient()
|
|
s.txn.init()
|
|
|
|
sessionBindHandle := bindinfo.NewSessionBindHandle(parser.New())
|
|
s.SetValue(bindinfo.SessionBindInfoKeyType, sessionBindHandle)
|
|
s.SetSessionStatesHandler(sessionstates.StateBinding, sessionBindHandle)
|
|
return s, nil
|
|
}
|
|
|
|
// CreateSessionWithDomain creates a new Session and binds it with a Domain.
|
|
// We need this because when we start DDL in Domain, the DDL need a session
|
|
// to change some system tables. But at that time, we have been already in
|
|
// a lock context, which cause we can't call createSession directly.
|
|
func CreateSessionWithDomain(store kv.Storage, dom *domain.Domain) (*session, error) {
|
|
s := &session{
|
|
store: store,
|
|
sessionVars: variable.NewSessionVars(),
|
|
client: store.GetClient(),
|
|
mppClient: store.GetMPPClient(),
|
|
stmtStats: stmtstats.CreateStatementStats(),
|
|
sessionStatesHandlers: make(map[sessionstates.SessionStateType]sessionctx.SessionStatesHandler),
|
|
}
|
|
s.functionUsageMu.builtinFunctionUsage = make(telemetry.BuiltinFunctionsUsage)
|
|
s.mu.values = make(map[fmt.Stringer]interface{})
|
|
s.lockedTables = make(map[int64]model.TableLockTpInfo)
|
|
domain.BindDomain(s, dom)
|
|
// session implements variable.GlobalVarAccessor. Bind it to ctx.
|
|
s.sessionVars.GlobalVarsAccessor = s
|
|
s.txn.init()
|
|
return s, nil
|
|
}
|
|
|
|
const (
|
|
notBootstrapped = 0
|
|
)
|
|
|
|
func getStoreBootstrapVersion(store kv.Storage) int64 {
|
|
storeBootstrappedLock.Lock()
|
|
defer storeBootstrappedLock.Unlock()
|
|
// check in memory
|
|
_, ok := storeBootstrapped[store.UUID()]
|
|
if ok {
|
|
return currentBootstrapVersion
|
|
}
|
|
|
|
var ver int64
|
|
// check in kv store
|
|
ctx := kv.WithInternalSourceType(context.Background(), kv.InternalTxnBootstrap)
|
|
err := kv.RunInNewTxn(ctx, store, false, func(ctx context.Context, txn kv.Transaction) error {
|
|
var err error
|
|
t := meta.NewMeta(txn)
|
|
ver, err = t.GetBootstrapVersion()
|
|
return err
|
|
})
|
|
if err != nil {
|
|
logutil.BgLogger().Fatal("check bootstrapped failed",
|
|
zap.Error(err))
|
|
}
|
|
|
|
if ver > notBootstrapped {
|
|
// here mean memory is not ok, but other server has already finished it
|
|
storeBootstrapped[store.UUID()] = true
|
|
}
|
|
|
|
return ver
|
|
}
|
|
|
|
func finishBootstrap(store kv.Storage) {
|
|
setStoreBootstrapped(store.UUID())
|
|
|
|
ctx := kv.WithInternalSourceType(context.Background(), kv.InternalTxnBootstrap)
|
|
err := kv.RunInNewTxn(ctx, store, true, func(ctx context.Context, txn kv.Transaction) error {
|
|
t := meta.NewMeta(txn)
|
|
err := t.FinishBootstrap(currentBootstrapVersion)
|
|
return err
|
|
})
|
|
if err != nil {
|
|
logutil.BgLogger().Fatal("finish bootstrap failed",
|
|
zap.Error(err))
|
|
}
|
|
}
|
|
|
|
const quoteCommaQuote = "', '"
|
|
|
|
// loadCommonGlobalVariablesIfNeeded loads and applies commonly used global variables for the session.
|
|
func (s *session) loadCommonGlobalVariablesIfNeeded() error {
|
|
vars := s.sessionVars
|
|
if vars.CommonGlobalLoaded {
|
|
return nil
|
|
}
|
|
if s.Value(sessionctx.Initing) != nil {
|
|
// When running bootstrap or upgrade, we should not access global storage.
|
|
return nil
|
|
}
|
|
|
|
vars.CommonGlobalLoaded = true
|
|
|
|
// Deep copy sessionvar cache
|
|
sessionCache, err := domain.GetDomain(s).GetSessionCache()
|
|
if err != nil {
|
|
return err
|
|
}
|
|
for varName, varVal := range sessionCache {
|
|
if _, ok := vars.GetSystemVar(varName); !ok {
|
|
err = vars.SetSystemVarWithRelaxedValidation(varName, varVal)
|
|
if err != nil {
|
|
if variable.ErrUnknownSystemVar.Equal(err) {
|
|
continue // sessionCache is stale; sysvar has likely been unregistered
|
|
}
|
|
return err
|
|
}
|
|
}
|
|
}
|
|
// when client set Capability Flags CLIENT_INTERACTIVE, init wait_timeout with interactive_timeout
|
|
if vars.ClientCapability&mysql.ClientInteractive > 0 {
|
|
if varVal, ok := vars.GetSystemVar(variable.InteractiveTimeout); ok {
|
|
if err := vars.SetSystemVar(variable.WaitTimeout, varVal); err != nil {
|
|
return err
|
|
}
|
|
}
|
|
}
|
|
return nil
|
|
}
|
|
|
|
// PrepareTxnCtx begins a transaction, and creates a new transaction context.
|
|
// It is called before we execute a sql query.
|
|
func (s *session) PrepareTxnCtx(ctx context.Context) error {
|
|
s.currentCtx = ctx
|
|
if s.txn.validOrPending() {
|
|
return nil
|
|
}
|
|
|
|
txnMode := ast.Optimistic
|
|
if !s.sessionVars.IsAutocommit() || s.sessionVars.RetryInfo.Retrying ||
|
|
config.GetGlobalConfig().PessimisticTxn.PessimisticAutoCommit.Load() {
|
|
if s.sessionVars.TxnMode == ast.Pessimistic {
|
|
txnMode = ast.Pessimistic
|
|
}
|
|
}
|
|
|
|
return sessiontxn.GetTxnManager(s).EnterNewTxn(ctx, &sessiontxn.EnterNewTxnRequest{
|
|
Type: sessiontxn.EnterNewTxnBeforeStmt,
|
|
TxnMode: txnMode,
|
|
})
|
|
}
|
|
|
|
// PrepareTSFuture uses to try to get ts future.
|
|
func (s *session) PrepareTSFuture(ctx context.Context, future oracle.Future, scope string) error {
|
|
if s.txn.Valid() {
|
|
return errors.New("cannot prepare ts future when txn is valid")
|
|
}
|
|
|
|
failpoint.Inject("assertTSONotRequest", func() {
|
|
if _, ok := future.(sessiontxn.ConstantFuture); !ok {
|
|
panic("tso shouldn't be requested")
|
|
}
|
|
})
|
|
|
|
failpoint.InjectContext(ctx, "mockGetTSFail", func() {
|
|
future = txnFailFuture{}
|
|
})
|
|
|
|
s.txn.changeToPending(&txnFuture{
|
|
future: future,
|
|
store: s.store,
|
|
txnScope: scope,
|
|
})
|
|
return nil
|
|
}
|
|
|
|
// GetPreparedTxnFuture returns the TxnFuture if it is valid or pending.
|
|
// It returns nil otherwise.
|
|
func (s *session) GetPreparedTxnFuture() sessionctx.TxnFuture {
|
|
if !s.txn.validOrPending() {
|
|
return nil
|
|
}
|
|
return &s.txn
|
|
}
|
|
|
|
// RefreshTxnCtx implements context.RefreshTxnCtx interface.
|
|
func (s *session) RefreshTxnCtx(ctx context.Context) error {
|
|
var commitDetail *tikvutil.CommitDetails
|
|
ctx = context.WithValue(ctx, tikvutil.CommitDetailCtxKey, &commitDetail)
|
|
err := s.doCommit(ctx)
|
|
if commitDetail != nil {
|
|
s.GetSessionVars().StmtCtx.MergeExecDetails(nil, commitDetail)
|
|
}
|
|
if err != nil {
|
|
return err
|
|
}
|
|
|
|
s.updateStatsDeltaToCollector()
|
|
|
|
return sessiontxn.NewTxn(ctx, s)
|
|
}
|
|
|
|
// GetStore gets the store of session.
|
|
func (s *session) GetStore() kv.Storage {
|
|
return s.store
|
|
}
|
|
|
|
func (s *session) ShowProcess() *util.ProcessInfo {
|
|
var pi *util.ProcessInfo
|
|
tmp := s.processInfo.Load()
|
|
if tmp != nil {
|
|
pi = tmp.(*util.ProcessInfo)
|
|
}
|
|
return pi
|
|
}
|
|
|
|
// GetStartTSFromSession returns the startTS in the session `se`
|
|
func GetStartTSFromSession(se interface{}) (uint64, uint64) {
|
|
var startTS, processInfoID uint64
|
|
tmp, ok := se.(*session)
|
|
if !ok {
|
|
logutil.BgLogger().Error("GetStartTSFromSession failed, can't transform to session struct")
|
|
return 0, 0
|
|
}
|
|
processInfo := tmp.ShowProcess()
|
|
if processInfo != nil {
|
|
processInfoID = processInfo.ID
|
|
}
|
|
txnInfo := tmp.TxnInfo()
|
|
if txnInfo != nil {
|
|
startTS = txnInfo.StartTS
|
|
}
|
|
|
|
logutil.BgLogger().Debug(
|
|
"GetStartTSFromSession getting startTS of internal session",
|
|
zap.Uint64("startTS", startTS), zap.Time("start time", oracle.GetTimeFromTS(startTS)))
|
|
|
|
return startTS, processInfoID
|
|
}
|
|
|
|
// logStmt logs some crucial SQL including: CREATE USER/GRANT PRIVILEGE/CHANGE PASSWORD/DDL etc and normal SQL
|
|
// if variable.ProcessGeneralLog is set.
|
|
func logStmt(execStmt *executor.ExecStmt, s *session) {
|
|
vars := s.GetSessionVars()
|
|
switch stmt := execStmt.StmtNode.(type) {
|
|
case *ast.CreateUserStmt, *ast.DropUserStmt, *ast.AlterUserStmt, *ast.SetPwdStmt, *ast.GrantStmt,
|
|
*ast.RevokeStmt, *ast.AlterTableStmt, *ast.CreateDatabaseStmt, *ast.CreateIndexStmt, *ast.CreateTableStmt,
|
|
*ast.DropDatabaseStmt, *ast.DropIndexStmt, *ast.DropTableStmt, *ast.RenameTableStmt, *ast.TruncateTableStmt,
|
|
*ast.RenameUserStmt:
|
|
user := vars.User
|
|
schemaVersion := s.GetInfoSchema().SchemaMetaVersion()
|
|
if ss, ok := execStmt.StmtNode.(ast.SensitiveStmtNode); ok {
|
|
logutil.BgLogger().Info("CRUCIAL OPERATION",
|
|
zap.Uint64("conn", vars.ConnectionID),
|
|
zap.Int64("schemaVersion", schemaVersion),
|
|
zap.String("secure text", ss.SecureText()),
|
|
zap.Stringer("user", user))
|
|
} else {
|
|
logutil.BgLogger().Info("CRUCIAL OPERATION",
|
|
zap.Uint64("conn", vars.ConnectionID),
|
|
zap.Int64("schemaVersion", schemaVersion),
|
|
zap.String("cur_db", vars.CurrentDB),
|
|
zap.String("sql", stmt.Text()),
|
|
zap.Stringer("user", user))
|
|
}
|
|
default:
|
|
logGeneralQuery(execStmt, s, false)
|
|
}
|
|
}
|
|
|
|
func logGeneralQuery(execStmt *executor.ExecStmt, s *session, isPrepared bool) {
|
|
vars := s.GetSessionVars()
|
|
if variable.ProcessGeneralLog.Load() && !vars.InRestrictedSQL {
|
|
var query string
|
|
if isPrepared {
|
|
query = execStmt.OriginText()
|
|
} else {
|
|
query = execStmt.GetTextToLog()
|
|
}
|
|
|
|
query = executor.QueryReplacer.Replace(query)
|
|
if !vars.EnableRedactLog {
|
|
query += vars.PreparedParams.String()
|
|
}
|
|
logutil.BgLogger().Info("GENERAL_LOG",
|
|
zap.Uint64("conn", vars.ConnectionID),
|
|
zap.String("user", vars.User.LoginString()),
|
|
zap.Int64("schemaVersion", s.GetInfoSchema().SchemaMetaVersion()),
|
|
zap.Uint64("txnStartTS", vars.TxnCtx.StartTS),
|
|
zap.Uint64("forUpdateTS", vars.TxnCtx.GetForUpdateTS()),
|
|
zap.Bool("isReadConsistency", vars.IsIsolation(ast.ReadCommitted)),
|
|
zap.String("currentDB", vars.CurrentDB),
|
|
zap.Bool("isPessimistic", vars.TxnCtx.IsPessimistic),
|
|
zap.String("sessionTxnMode", vars.GetReadableTxnMode()),
|
|
zap.String("sql", query))
|
|
}
|
|
}
|
|
|
|
func (s *session) recordOnTransactionExecution(err error, counter int, duration float64) {
|
|
if s.sessionVars.TxnCtx.IsPessimistic {
|
|
if err != nil {
|
|
statementPerTransactionPessimisticError.Observe(float64(counter))
|
|
transactionDurationPessimisticAbort.Observe(duration)
|
|
} else {
|
|
statementPerTransactionPessimisticOK.Observe(float64(counter))
|
|
transactionDurationPessimisticCommit.Observe(duration)
|
|
}
|
|
} else {
|
|
if err != nil {
|
|
statementPerTransactionOptimisticError.Observe(float64(counter))
|
|
transactionDurationOptimisticAbort.Observe(duration)
|
|
} else {
|
|
statementPerTransactionOptimisticOK.Observe(float64(counter))
|
|
transactionDurationOptimisticCommit.Observe(duration)
|
|
}
|
|
}
|
|
}
|
|
|
|
func (s *session) checkPlacementPolicyBeforeCommit() error {
|
|
var err error
|
|
// Get the txnScope of the transaction we're going to commit.
|
|
txnScope := s.GetSessionVars().TxnCtx.TxnScope
|
|
if txnScope == "" {
|
|
txnScope = kv.GlobalTxnScope
|
|
}
|
|
if txnScope != kv.GlobalTxnScope {
|
|
is := s.GetInfoSchema().(infoschema.InfoSchema)
|
|
deltaMap := s.GetSessionVars().TxnCtx.TableDeltaMap
|
|
for physicalTableID := range deltaMap {
|
|
var tableName string
|
|
var partitionName string
|
|
tblInfo, _, partInfo := is.FindTableByPartitionID(physicalTableID)
|
|
if tblInfo != nil && partInfo != nil {
|
|
tableName = tblInfo.Meta().Name.String()
|
|
partitionName = partInfo.Name.String()
|
|
} else {
|
|
tblInfo, _ := is.TableByID(physicalTableID)
|
|
tableName = tblInfo.Meta().Name.String()
|
|
}
|
|
bundle, ok := is.PlacementBundleByPhysicalTableID(physicalTableID)
|
|
if !ok {
|
|
errMsg := fmt.Sprintf("table %v doesn't have placement policies with txn_scope %v",
|
|
tableName, txnScope)
|
|
if len(partitionName) > 0 {
|
|
errMsg = fmt.Sprintf("table %v's partition %v doesn't have placement policies with txn_scope %v",
|
|
tableName, partitionName, txnScope)
|
|
}
|
|
err = dbterror.ErrInvalidPlacementPolicyCheck.GenWithStackByArgs(errMsg)
|
|
break
|
|
}
|
|
dcLocation, ok := bundle.GetLeaderDC(placement.DCLabelKey)
|
|
if !ok {
|
|
errMsg := fmt.Sprintf("table %v's leader placement policy is not defined", tableName)
|
|
if len(partitionName) > 0 {
|
|
errMsg = fmt.Sprintf("table %v's partition %v's leader placement policy is not defined", tableName, partitionName)
|
|
}
|
|
err = dbterror.ErrInvalidPlacementPolicyCheck.GenWithStackByArgs(errMsg)
|
|
break
|
|
}
|
|
if dcLocation != txnScope {
|
|
errMsg := fmt.Sprintf("table %v's leader location %v is out of txn_scope %v", tableName, dcLocation, txnScope)
|
|
if len(partitionName) > 0 {
|
|
errMsg = fmt.Sprintf("table %v's partition %v's leader location %v is out of txn_scope %v",
|
|
tableName, partitionName, dcLocation, txnScope)
|
|
}
|
|
err = dbterror.ErrInvalidPlacementPolicyCheck.GenWithStackByArgs(errMsg)
|
|
break
|
|
}
|
|
// FIXME: currently we assume the physicalTableID is the partition ID. In future, we should consider the situation
|
|
// if the physicalTableID belongs to a Table.
|
|
partitionID := physicalTableID
|
|
tbl, _, partitionDefInfo := is.FindTableByPartitionID(partitionID)
|
|
if tbl != nil {
|
|
tblInfo := tbl.Meta()
|
|
state := tblInfo.Partition.GetStateByID(partitionID)
|
|
if state == model.StateGlobalTxnOnly {
|
|
err = dbterror.ErrInvalidPlacementPolicyCheck.GenWithStackByArgs(
|
|
fmt.Sprintf("partition %s of table %s can not be written by local transactions when its placement policy is being altered",
|
|
tblInfo.Name, partitionDefInfo.Name))
|
|
break
|
|
}
|
|
}
|
|
}
|
|
}
|
|
return err
|
|
}
|
|
|
|
func (s *session) SetPort(port string) {
|
|
s.sessionVars.Port = port
|
|
}
|
|
|
|
// GetTxnWriteThroughputSLI implements the Context interface.
|
|
func (s *session) GetTxnWriteThroughputSLI() *sli.TxnWriteThroughputSLI {
|
|
return &s.txn.writeSLI
|
|
}
|
|
|
|
// GetInfoSchema returns snapshotInfoSchema if snapshot schema is set.
|
|
// Transaction infoschema is returned if inside an explicit txn.
|
|
// Otherwise the latest infoschema is returned.
|
|
func (s *session) GetInfoSchema() sessionctx.InfoschemaMetaVersion {
|
|
vars := s.GetSessionVars()
|
|
var is infoschema.InfoSchema
|
|
if snap, ok := vars.SnapshotInfoschema.(infoschema.InfoSchema); ok {
|
|
logutil.BgLogger().Info("use snapshot schema", zap.Uint64("conn", vars.ConnectionID), zap.Int64("schemaVersion", snap.SchemaMetaVersion()))
|
|
is = snap
|
|
} else if vars.TxnCtx != nil && vars.InTxn() {
|
|
if tmp, ok := vars.TxnCtx.InfoSchema.(infoschema.InfoSchema); ok {
|
|
is = tmp
|
|
}
|
|
}
|
|
|
|
if is == nil {
|
|
is = domain.GetDomain(s).InfoSchema()
|
|
}
|
|
|
|
// Override the infoschema if the session has temporary table.
|
|
return temptable.AttachLocalTemporaryTableInfoSchema(s, is)
|
|
}
|
|
|
|
func (s *session) GetDomainInfoSchema() sessionctx.InfoschemaMetaVersion {
|
|
is := domain.GetDomain(s).InfoSchema()
|
|
return temptable.AttachLocalTemporaryTableInfoSchema(s, is)
|
|
}
|
|
|
|
func getSnapshotInfoSchema(s sessionctx.Context, snapshotTS uint64) (infoschema.InfoSchema, error) {
|
|
is, err := domain.GetDomain(s).GetSnapshotInfoSchema(snapshotTS)
|
|
if err != nil {
|
|
return nil, err
|
|
}
|
|
// Set snapshot does not affect the witness of the local temporary table.
|
|
// The session always see the latest temporary tables.
|
|
return temptable.AttachLocalTemporaryTableInfoSchema(s, is), nil
|
|
}
|
|
|
|
func (s *session) updateTelemetryMetric(es *executor.ExecStmt) {
|
|
if es.Ti == nil {
|
|
return
|
|
}
|
|
if s.isInternal() {
|
|
return
|
|
}
|
|
|
|
ti := es.Ti
|
|
if ti.UseRecursive {
|
|
telemetryCTEUsageRecurCTE.Inc()
|
|
} else if ti.UseNonRecursive {
|
|
telemetryCTEUsageNonRecurCTE.Inc()
|
|
} else {
|
|
telemetryCTEUsageNotCTE.Inc()
|
|
}
|
|
|
|
if ti.UseMultiSchemaChange {
|
|
telemetryMultiSchemaChangeUsage.Inc()
|
|
}
|
|
|
|
if ti.PartitionTelemetry != nil {
|
|
if ti.PartitionTelemetry.UseTablePartition {
|
|
telemetryTablePartitionUsage.Inc()
|
|
telemetryTablePartitionMaxPartitionsUsage.Add(float64(ti.PartitionTelemetry.TablePartitionMaxPartitionsNum))
|
|
}
|
|
if ti.PartitionTelemetry.UseTablePartitionList {
|
|
telemetryTablePartitionListUsage.Inc()
|
|
}
|
|
if ti.PartitionTelemetry.UseTablePartitionRange {
|
|
telemetryTablePartitionRangeUsage.Inc()
|
|
}
|
|
if ti.PartitionTelemetry.UseTablePartitionHash {
|
|
telemetryTablePartitionHashUsage.Inc()
|
|
}
|
|
if ti.PartitionTelemetry.UseTablePartitionRangeColumns {
|
|
telemetryTablePartitionRangeColumnsUsage.Inc()
|
|
}
|
|
if ti.PartitionTelemetry.UseTablePartitionListColumns {
|
|
telemetryTablePartitionListColumnsUsage.Inc()
|
|
}
|
|
}
|
|
}
|
|
|
|
// GetBuiltinFunctionUsage returns the replica of counting of builtin function usage
|
|
func (s *session) GetBuiltinFunctionUsage() map[string]uint32 {
|
|
replica := make(map[string]uint32)
|
|
s.functionUsageMu.RLock()
|
|
defer s.functionUsageMu.RUnlock()
|
|
for key, value := range s.functionUsageMu.builtinFunctionUsage {
|
|
replica[key] = value
|
|
}
|
|
return replica
|
|
}
|
|
|
|
// BuiltinFunctionUsageInc increase the counting of the builtin function usage
|
|
func (s *session) BuiltinFunctionUsageInc(scalarFuncSigName string) {
|
|
s.functionUsageMu.Lock()
|
|
defer s.functionUsageMu.Unlock()
|
|
s.functionUsageMu.builtinFunctionUsage.Inc(scalarFuncSigName)
|
|
}
|
|
|
|
func (s *session) GetStmtStats() *stmtstats.StatementStats {
|
|
return s.stmtStats
|
|
}
|
|
|
|
// EncodeSessionStates implements SessionStatesHandler.EncodeSessionStates interface.
|
|
func (s *session) EncodeSessionStates(ctx context.Context, sctx sessionctx.Context, sessionStates *sessionstates.SessionStates) error {
|
|
// Transaction status is hard to encode, so we do not support it.
|
|
s.txn.mu.Lock()
|
|
valid := s.txn.Valid()
|
|
s.txn.mu.Unlock()
|
|
if valid {
|
|
return sessionstates.ErrCannotMigrateSession.GenWithStackByArgs("session has an active transaction")
|
|
}
|
|
// Data in local temporary tables is hard to encode, so we do not support it.
|
|
// Check temporary tables here to avoid circle dependency.
|
|
if s.sessionVars.LocalTemporaryTables != nil {
|
|
localTempTables := s.sessionVars.LocalTemporaryTables.(*infoschema.LocalTemporaryTables)
|
|
if localTempTables.Count() > 0 {
|
|
return sessionstates.ErrCannotMigrateSession.GenWithStackByArgs("session has local temporary tables")
|
|
}
|
|
}
|
|
// The advisory locks will be released when the session is closed.
|
|
if len(s.advisoryLocks) > 0 {
|
|
return sessionstates.ErrCannotMigrateSession.GenWithStackByArgs("session has advisory locks")
|
|
}
|
|
// The TableInfo stores session ID and server ID, so the session cannot be migrated.
|
|
if len(s.lockedTables) > 0 {
|
|
return sessionstates.ErrCannotMigrateSession.GenWithStackByArgs("session has locked tables")
|
|
}
|
|
|
|
if err := s.sessionVars.EncodeSessionStates(ctx, sessionStates); err != nil {
|
|
return err
|
|
}
|
|
|
|
// Encode session variables. We put it here instead of SessionVars to avoid cycle import.
|
|
sessionStates.SystemVars = make(map[string]string)
|
|
for _, sv := range variable.GetSysVars() {
|
|
switch {
|
|
case sv.Hidden, sv.HasNoneScope(), sv.HasInstanceScope(), !sv.HasSessionScope():
|
|
// Hidden and none-scoped variables cannot be modified.
|
|
// Instance-scoped variables don't need to be encoded.
|
|
// Noop variables should also be migrated even if they are noop.
|
|
continue
|
|
case sv.ReadOnly:
|
|
// Skip read-only variables here. We encode them into SessionStates manually.
|
|
continue
|
|
case sem.IsEnabled() && sem.IsInvisibleSysVar(sv.Name):
|
|
// If they are shown, there will be a security issue.
|
|
continue
|
|
}
|
|
// Get all session variables because the default values may change between versions.
|
|
if val, keep, err := s.sessionVars.GetSessionStatesSystemVar(sv.Name); err != nil {
|
|
return err
|
|
} else if keep {
|
|
sessionStates.SystemVars[sv.Name] = val
|
|
}
|
|
}
|
|
|
|
// Encode prepared statements and sql bindings.
|
|
for _, handler := range s.sessionStatesHandlers {
|
|
if err := handler.EncodeSessionStates(ctx, s, sessionStates); err != nil {
|
|
return err
|
|
}
|
|
}
|
|
return nil
|
|
}
|
|
|
|
// DecodeSessionStates implements SessionStatesHandler.DecodeSessionStates interface.
|
|
func (s *session) DecodeSessionStates(ctx context.Context, sctx sessionctx.Context, sessionStates *sessionstates.SessionStates) error {
|
|
// Decode prepared statements and sql bindings.
|
|
for _, handler := range s.sessionStatesHandlers {
|
|
if err := handler.DecodeSessionStates(ctx, s, sessionStates); err != nil {
|
|
return err
|
|
}
|
|
}
|
|
|
|
// Decode session variables.
|
|
for name, val := range sessionStates.SystemVars {
|
|
if err := s.sessionVars.SetSystemVarWithoutValidation(name, val); err != nil {
|
|
return err
|
|
}
|
|
}
|
|
|
|
// Decoding session vars / prepared statements may override stmt ctx, such as warnings,
|
|
// so we decode stmt ctx at last.
|
|
return s.sessionVars.DecodeSessionStates(ctx, sessionStates)
|
|
}
|
|
|
|
func (s *session) setRequestSource(ctx context.Context, stmtLabel string, stmtNode ast.StmtNode) {
|
|
if !s.isInternal() {
|
|
if txn, _ := s.Txn(false); txn != nil && txn.Valid() {
|
|
txn.SetOption(kv.RequestSourceType, stmtLabel)
|
|
} else {
|
|
s.sessionVars.RequestSourceType = stmtLabel
|
|
}
|
|
} else {
|
|
if source := ctx.Value(kv.RequestSourceKey); source != nil {
|
|
s.sessionVars.RequestSourceType = source.(kv.RequestSource).RequestSourceType
|
|
} else {
|
|
// panic in test mode in case there are requests without source in the future.
|
|
// log warnings in production mode.
|
|
if flag.Lookup("test.v") != nil || flag.Lookup("check.v") != nil {
|
|
panic("unexpected no source type context, if you see this error, " +
|
|
"the `RequestSourceTypeKey` is missing in your context")
|
|
} else {
|
|
logutil.Logger(ctx).Warn("unexpected no source type context, if you see this warning, "+
|
|
"the `RequestSourceTypeKey` is missing in the context",
|
|
zap.Bool("internal", s.isInternal()),
|
|
zap.String("sql", stmtNode.Text()))
|
|
}
|
|
}
|
|
}
|
|
}
|