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// Copyright 2018 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
// 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 domain
import (
// SchemaChecker is used for checking schema-validity.
type SchemaChecker struct {
schemaVer int64
relatedTableIDs []int64
var (
// SchemaOutOfDateRetryInterval is the backoff time before retrying.
SchemaOutOfDateRetryInterval = int64(500 * time.Millisecond)
// SchemaOutOfDateRetryTimes is the max retry count when the schema is out of date.
SchemaOutOfDateRetryTimes = int32(10)
// NewSchemaChecker creates a new schema checker.
func NewSchemaChecker(do *Domain, schemaVer int64, relatedTableIDs []int64) *SchemaChecker {
return &SchemaChecker{
SchemaValidator: do.SchemaValidator,
schemaVer: schemaVer,
relatedTableIDs: relatedTableIDs,
// Check checks the validity of the schema version.
func (s *SchemaChecker) Check(txnTS uint64) error {
schemaOutOfDateRetryInterval := atomic.LoadInt64(&SchemaOutOfDateRetryInterval)
schemaOutOfDateRetryTimes := int(atomic.LoadInt32(&SchemaOutOfDateRetryTimes))
for i := 0; i < schemaOutOfDateRetryTimes; i++ {
result := s.SchemaValidator.Check(txnTS, s.schemaVer, s.relatedTableIDs)
switch result {
case ResultSucc:
return nil
case ResultFail:
return ErrInfoSchemaChanged
case ResultUnknown:
return ErrInfoSchemaExpired
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