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binloginfo.go
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binloginfo.go
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// Copyright 2016 PingCAP, Inc.
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// See the License for the specific language governing permissions and
// limitations under the License.
package binloginfo
import (
"regexp"
"strings"
"sync"
"sync/atomic"
"time"
"github.com/juju/errors"
"github.com/pingcap/tidb/kv"
"github.com/pingcap/tidb/metrics"
"github.com/pingcap/tidb/sessionctx"
"github.com/pingcap/tidb/terror"
binlog "github.com/pingcap/tipb/go-binlog"
log "github.com/sirupsen/logrus"
"golang.org/x/net/context"
"google.golang.org/grpc"
)
func init() {
grpc.EnableTracing = false
}
// pumpClient is the gRPC client to write binlog, it is opened on server start and never close,
// shared by all sessions.
var pumpClient binlog.PumpClient
var pumpClientLock sync.RWMutex
// BinlogInfo contains binlog data and binlog client.
type BinlogInfo struct {
Data *binlog.Binlog
Client binlog.PumpClient
}
// GetPumpClient gets the pump client instance.
func GetPumpClient() binlog.PumpClient {
pumpClientLock.RLock()
client := pumpClient
pumpClientLock.RUnlock()
return client
}
// SetPumpClient sets the pump client instance.
func SetPumpClient(client binlog.PumpClient) {
pumpClientLock.Lock()
pumpClient = client
pumpClientLock.Unlock()
}
// GetPrewriteValue gets binlog prewrite value in the context.
func GetPrewriteValue(ctx sessionctx.Context, createIfNotExists bool) *binlog.PrewriteValue {
vars := ctx.GetSessionVars()
v, ok := vars.TxnCtx.Binlog.(*binlog.PrewriteValue)
if !ok && createIfNotExists {
schemaVer := ctx.GetSessionVars().TxnCtx.SchemaVersion
v = &binlog.PrewriteValue{SchemaVersion: schemaVer}
vars.TxnCtx.Binlog = v
}
return v
}
var skipBinlog uint32
var ignoreError uint32
// DisableSkipBinlogFlag disable the skipBinlog flag.
func DisableSkipBinlogFlag() {
atomic.StoreUint32(&skipBinlog, 0)
log.Warn("[binloginfo] disable the skipBinlog flag")
}
// SetIgnoreError sets the ignoreError flag, this function called when TiDB start
// up and find config.Binlog.IgnoreError is true.
func SetIgnoreError(on bool) {
if on {
atomic.StoreUint32(&ignoreError, 1)
} else {
atomic.StoreUint32(&ignoreError, 0)
}
}
// WriteBinlog writes a binlog to Pump.
func (info *BinlogInfo) WriteBinlog(clusterID uint64) error {
skip := atomic.LoadUint32(&skipBinlog)
if skip > 0 {
metrics.CriticalErrorCounter.Add(1)
return nil
}
commitData, err := info.Data.Marshal()
if err != nil {
return errors.Trace(err)
}
req := &binlog.WriteBinlogReq{ClusterID: clusterID, Payload: commitData}
// Retry many times because we may raise CRITICAL error here.
for i := 0; i < 20; i++ {
var resp *binlog.WriteBinlogResp
resp, err = info.Client.WriteBinlog(context.Background(), req)
if err == nil && resp.Errmsg != "" {
err = errors.New(resp.Errmsg)
}
if err == nil {
return nil
}
if strings.Contains(err.Error(), "received message larger than max") {
// This kind of error is not critical and not retryable, return directly.
return errors.Errorf("binlog data is too large (%s)", err.Error())
}
log.Errorf("write binlog error %v", err)
time.Sleep(time.Second)
}
if err != nil {
if atomic.LoadUint32(&ignoreError) == 1 {
log.Errorf("critical error, write binlog fail but error ignored: %s", errors.ErrorStack(err))
metrics.CriticalErrorCounter.Add(1)
// If error happens once, we'll stop writing binlog.
atomic.CompareAndSwapUint32(&skipBinlog, skip, skip+1)
return nil
}
}
return terror.ErrCritical.GenByArgs(err)
}
// SetDDLBinlog sets DDL binlog in the kv.Transaction.
func SetDDLBinlog(client interface{}, txn kv.Transaction, jobID int64, ddlQuery string) {
if client == nil {
return
}
ddlQuery = addSpecialComment(ddlQuery)
info := &BinlogInfo{
Data: &binlog.Binlog{
Tp: binlog.BinlogType_Prewrite,
DdlJobId: jobID,
DdlQuery: []byte(ddlQuery),
},
Client: client.(binlog.PumpClient),
}
txn.SetOption(kv.BinlogInfo, info)
}
const specialPrefix = `/*!90000 `
func addSpecialComment(ddlQuery string) string {
if strings.Contains(ddlQuery, specialPrefix) {
return ddlQuery
}
upperQuery := strings.ToUpper(ddlQuery)
reg, err := regexp.Compile(`SHARD_ROW_ID_BITS\s*=\s*\d+`)
terror.Log(err)
loc := reg.FindStringIndex(upperQuery)
if len(loc) < 2 {
return ddlQuery
}
return ddlQuery[:loc[0]] + specialPrefix + ddlQuery[loc[0]:loc[1]] + ` */` + ddlQuery[loc[1]:]
}