tidb retry 源码
tidb retry 代码
文件路径：/util/dbutil/retry.go
// Copyright 2022 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 dbutil
import (
"strings"
"github.com/go-sql-driver/mysql"
"github.com/pingcap/errors"
"github.com/pingcap/tidb/errno"
)
var (
// Retryable1105Msgs list the error messages of some retryable error with `1105` code (`ErrUnknown`).
Retryable1105Msgs = []string{
"Information schema is out of date",
"Information schema is changed",
}
)
// IsRetryableError checks whether the SQL statement can be retry directly when encountering this error.
// NOTE: this should be compatible with different TiDB versions.
// some errors are only retryable in some special cases, then we mark it as un-retryable:
// - errno.ErrTiKVServerTimeout
// - errno.ErrTableLocked
//
// some errors are un-retryable:
// - errno.ErrQueryInterrupted
//
// some errors are unknown:
// - errno.ErrRegionUnavailable
func IsRetryableError(err error) bool {
err = errors.Cause(err) // check the original error
mysqlErr, ok := err.(*mysql.MySQLError)
if !ok {
return false
}
switch mysqlErr.Number {
case errno.ErrLockDeadlock: // https://dev.mysql.com/doc/refman/5.7/en/innodb-deadlocks.html
return true // retryable error in MySQL
case errno.ErrPDServerTimeout,
errno.ErrTiKVServerBusy,
errno.ErrResolveLockTimeout,
errno.ErrInfoSchemaExpired,
errno.ErrInfoSchemaChanged,
errno.ErrWriteConflictInTiDB,
errno.ErrTxnRetryable,
errno.ErrWriteConflict,
errno.ErrColumnInChange:
return true // retryable error in TiDB
case errno.ErrUnknown: // the old version of TiDB uses `1105` frequently, this should be compatible.
for _, msg := range Retryable1105Msgs {
if strings.Contains(mysqlErr.Message, msg) {
return true
}
}
}
return false
}
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