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lock_resolver.go
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/
lock_resolver.go
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// Copyright 2020 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 txnutil
import (
"bytes"
"context"
"github.com/pingcap/errors"
"github.com/pingcap/kvproto/pkg/kvrpcpb"
"github.com/pingcap/log"
tikverr "github.com/tikv/client-go/v2/error"
"github.com/tikv/client-go/v2/tikv"
"github.com/tikv/client-go/v2/tikvrpc"
"github.com/tikv/client-go/v2/txnkv"
"go.uber.org/zap"
)
// LockResolver resolves lock in the given region.
type LockResolver interface {
Resolve(ctx context.Context, regionID uint64, maxVersion uint64) error
}
type resolver struct {
kvStorage tikv.Storage
}
// NewLockerResolver returns a LockResolver.
func NewLockerResolver(kvStorage tikv.Storage) LockResolver {
return &resolver{
kvStorage: kvStorage,
}
}
const scanLockLimit = 1024
func (r *resolver) Resolve(ctx context.Context, regionID uint64, maxVersion uint64) error {
// TODO test whether this function will kill active transaction
req := tikvrpc.NewRequest(tikvrpc.CmdScanLock, &kvrpcpb.ScanLockRequest{
MaxVersion: maxVersion,
Limit: scanLockLimit,
})
bo := tikv.NewGcResolveLockMaxBackoffer(ctx)
var loc *tikv.KeyLocation
var key []byte
flushRegion := func() error {
var err error
loc, err = r.kvStorage.GetRegionCache().LocateRegionByID(bo, regionID)
if err != nil {
return err
}
key = loc.StartKey
return nil
}
if err := flushRegion(); err != nil {
return errors.Trace(err)
}
for {
select {
case <-ctx.Done():
return ctx.Err()
default:
}
req.ScanLock().StartKey = key
resp, err := r.kvStorage.SendReq(bo, req, loc.Region, tikv.ReadTimeoutMedium)
if err != nil {
return errors.Trace(err)
}
regionErr, err := resp.GetRegionError()
if err != nil {
return errors.Trace(err)
}
if regionErr != nil {
err = bo.Backoff(tikv.BoRegionMiss(), errors.New(regionErr.String()))
if err != nil {
return errors.Trace(err)
}
if err := flushRegion(); err != nil {
return errors.Trace(err)
}
continue
}
if resp.Resp == nil {
return errors.Trace(tikverr.ErrBodyMissing)
}
locksResp := resp.Resp.(*kvrpcpb.ScanLockResponse)
if locksResp.GetError() != nil {
return errors.Errorf("unexpected scanlock error: %s", locksResp)
}
locksInfo := locksResp.GetLocks()
locks := make([]*txnkv.Lock, len(locksInfo))
for i := range locksInfo {
locks[i] = txnkv.NewLock(locksInfo[i])
}
_, err1 := r.kvStorage.GetLockResolver().ResolveLocks(bo, 0, locks)
if err1 != nil {
return errors.Trace(err1)
}
if len(locks) < scanLockLimit {
key = loc.EndKey
} else {
key = locks[len(locks)-1].Key
}
if len(key) == 0 || (len(loc.EndKey) != 0 && bytes.Compare(key, loc.EndKey) >= 0) {
break
}
bo = tikv.NewGcResolveLockMaxBackoffer(ctx)
}
log.Info("resolve lock successfully", zap.Uint64("regionID", regionID), zap.Uint64("maxVersion", maxVersion))
return nil
}