91 lines
3.2 KiB
Go
91 lines
3.2 KiB
Go
// Copyright 2021 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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// See the License for the specific language governing permissions and
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// limitations under the License.
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package copr
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import (
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"context"
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"sync/atomic"
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"time"
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"github.com/pingcap/errors"
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"github.com/pingcap/tidb/store/tikv"
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"github.com/pingcap/tidb/store/tikv/tikvrpc"
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"google.golang.org/grpc/codes"
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"google.golang.org/grpc/status"
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)
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// RegionBatchRequestSender sends BatchCop requests to TiFlash server by stream way.
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type RegionBatchRequestSender struct {
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*tikv.RegionRequestSender
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}
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// NewRegionBatchRequestSender creates a RegionBatchRequestSender object.
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func NewRegionBatchRequestSender(cache *tikv.RegionCache, client tikv.Client) *RegionBatchRequestSender {
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return &RegionBatchRequestSender{
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RegionRequestSender: tikv.NewRegionRequestSender(cache, client),
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}
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}
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func (ss *RegionBatchRequestSender) sendStreamReqToAddr(bo *tikv.Backoffer, ctxs []copTaskAndRPCContext, req *tikvrpc.Request, timout time.Duration) (resp *tikvrpc.Response, retry bool, cancel func(), err error) {
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// use the first ctx to send request, because every ctx has same address.
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cancel = func() {}
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rpcCtx := ctxs[0].ctx
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if e := tikvrpc.SetContext(req, rpcCtx.Meta, rpcCtx.Peer); e != nil {
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return nil, false, cancel, errors.Trace(e)
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}
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ctx := bo.GetCtx()
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if rawHook := ctx.Value(tikv.RPCCancellerCtxKey{}); rawHook != nil {
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ctx, cancel = rawHook.(*tikv.RPCCanceller).WithCancel(ctx)
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}
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start := time.Now()
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resp, err = ss.GetClient().SendRequest(ctx, rpcCtx.Addr, req, timout)
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if ss.Stats != nil {
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tikv.RecordRegionRequestRuntimeStats(ss.Stats, req.Type, time.Since(start))
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}
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if err != nil {
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cancel()
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ss.SetRPCError(err)
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e := ss.onSendFail(bo, ctxs, err)
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if e != nil {
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return nil, false, func() {}, errors.Trace(e)
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}
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return nil, true, func() {}, nil
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}
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// We don't need to process region error or lock error. Because TiFlash will retry by itself.
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return
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}
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func (ss *RegionBatchRequestSender) onSendFail(bo *tikv.Backoffer, ctxs []copTaskAndRPCContext, err error) error {
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// If it failed because the context is cancelled by ourself, don't retry.
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if errors.Cause(err) == context.Canceled || status.Code(errors.Cause(err)) == codes.Canceled {
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return errors.Trace(err)
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} else if atomic.LoadUint32(&tikv.ShuttingDown) > 0 {
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return tikv.ErrTiDBShuttingDown
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}
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for _, failedCtx := range ctxs {
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ctx := failedCtx.ctx
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if ctx.Meta != nil {
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ss.GetRegionCache().OnSendFail(bo, ctx, ss.NeedReloadRegion(ctx), err)
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}
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}
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// Retry on send request failure when it's not canceled.
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// When a store is not available, the leader of related region should be elected quickly.
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// TODO: the number of retry time should be limited:since region may be unavailable
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// when some unrecoverable disaster happened.
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err = bo.Backoff(tikv.BoTiFlashRPC, errors.Errorf("send tikv request error: %v, ctxs: %v, try next peer later", err, ctxs))
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return errors.Trace(err)
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}
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