78 lines
2.7 KiB
Go
78 lines
2.7 KiB
Go
// Copyright 2025 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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package vardef
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import (
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"strings"
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"sync/atomic"
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"time"
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)
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var (
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// schemaLease is lease of info schema, we use this to check whether info schema
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// is valid in SchemaChecker. we also use half of it as info schema reload interval.
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// Default info schema lease 45s which is init at main, we set it to 1 second
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// here for tests. you can change it with a proper time, but you must know that
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// too little may cause badly performance degradation.
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schemaLease = int64(1 * time.Second)
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// statsLease is the time for reload stats table.
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statsLease = int64(3 * time.Second)
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// planReplayerGCLease is the time for plan replayer gc.
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planReplayerGCLease = int64(10 * time.Minute)
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)
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// SetSchemaLease changes the default schema lease time for DDL.
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// This function is very dangerous, don't use it if you really know what you do.
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// SetSchemaLease only affects not local storage after bootstrapped.
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func SetSchemaLease(lease time.Duration) {
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atomic.StoreInt64(&schemaLease, int64(lease))
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}
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// GetSchemaLease returns the schema lease time.
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func GetSchemaLease() time.Duration {
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return time.Duration(atomic.LoadInt64(&schemaLease))
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}
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// SetStatsLease changes the default stats lease time for loading stats info.
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func SetStatsLease(lease time.Duration) {
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atomic.StoreInt64(&statsLease, int64(lease))
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}
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// GetStatsLease returns the stats lease time.
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func GetStatsLease() time.Duration {
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return time.Duration(atomic.LoadInt64(&statsLease))
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}
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// SetPlanReplayerGCLease changes the default plan repalyer gc lease time.
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func SetPlanReplayerGCLease(lease time.Duration) {
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atomic.StoreInt64(&planReplayerGCLease, int64(lease))
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}
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// GetPlanReplayerGCLease returns the plan replayer gc lease time.
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func GetPlanReplayerGCLease() time.Duration {
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return time.Duration(atomic.LoadInt64(&planReplayerGCLease))
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}
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// IsReadOnlyVarInNextGen checks if the variable is read-only in the nextgen.
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func IsReadOnlyVarInNextGen(name string) bool {
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name = strings.ToLower(name)
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switch name {
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case TiDBEnableMDL, TiDBMaxDistTaskNodes, TiDBDDLReorgMaxWriteSpeed, TiDBDDLDiskQuota,
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TiDBEnableDistTask, TiDBDDLEnableFastReorg:
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return true
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}
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return false
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}
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