tidb dead_table_lock_checker 源码
tidb dead_table_lock_checker 代码
文件路径：/ddl/util/dead_table_lock_checker.go
// 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,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
package util
import (
"context"
"strings"
"time"
"github.com/pingcap/errors"
"github.com/pingcap/tidb/parser/model"
"github.com/pingcap/tidb/util/logutil"
clientv3 "go.etcd.io/etcd/client/v3"
"go.uber.org/zap"
)
const (
defaultRetryCnt = 5
defaultRetryInterval = time.Millisecond * 200
defaultTimeout = time.Second
)
// DeadTableLockChecker uses to check dead table locks.
// If tidb-server panic or killed by others, the table locks hold by the killed tidb-server maybe doesn't released.
type DeadTableLockChecker struct {
etcdCli *clientv3.Client
}
// NewDeadTableLockChecker creates new DeadLockChecker.
func NewDeadTableLockChecker(etcdCli *clientv3.Client) DeadTableLockChecker {
return DeadTableLockChecker{
etcdCli: etcdCli,
}
}
func (d *DeadTableLockChecker) getAliveServers(ctx context.Context) (map[string]struct{}, error) {
var err error
var resp *clientv3.GetResponse
allInfos := make(map[string]struct{})
for i := 0; i < defaultRetryCnt; i++ {
select {
case <-ctx.Done():
return nil, ctx.Err()
default:
}
childCtx, cancel := context.WithTimeout(ctx, defaultTimeout)
resp, err = d.etcdCli.Get(childCtx, DDLAllSchemaVersions, clientv3.WithPrefix())
cancel()
if err != nil {
logutil.BgLogger().Info("[ddl] clean dead table lock get alive servers failed.", zap.Error(err))
time.Sleep(defaultRetryInterval)
continue
}
for _, kv := range resp.Kvs {
serverID := strings.TrimPrefix(string(kv.Key), DDLAllSchemaVersions+"/")
allInfos[serverID] = struct{}{}
}
return allInfos, nil
}
return nil, errors.Trace(err)
}
// GetDeadLockedTables gets dead locked tables.
func (d *DeadTableLockChecker) GetDeadLockedTables(ctx context.Context, schemas []*model.DBInfo) (map[model.SessionInfo][]model.TableLockTpInfo, error) {
if d.etcdCli == nil {
return nil, nil
}
aliveServers, err := d.getAliveServers(ctx)
if err != nil {
return nil, err
}
deadLockTables := make(map[model.SessionInfo][]model.TableLockTpInfo)
for _, schema := range schemas {
select {
case <-ctx.Done():
return nil, ctx.Err()
default:
}
for _, tbl := range schema.Tables {
if tbl.Lock == nil {
continue
}
for _, se := range tbl.Lock.Sessions {
if _, ok := aliveServers[se.ServerID]; !ok {
deadLockTables[se] = append(deadLockTables[se], model.TableLockTpInfo{
SchemaID: schema.ID,
TableID: tbl.ID,
Tp: tbl.Lock.Tp,
})
}
}
}
}
return deadLockTables, nil
}
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