tidb analyze_jobs 源码
tidb analyze_jobs 代码
文件路径：/statistics/analyze_jobs.go
// Copyright 2019 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 statistics
import (
"sync"
"time"
)
// AnalyzeJob is used to represent the status of one analyze job.
type AnalyzeJob struct {
ID *uint64
DBName string
TableName string
PartitionName string
JobInfo string
StartTime time.Time
EndTime time.Time
Progress AnalyzeProgress
}
// AnalyzeProgress represents the process of one analyze job.
type AnalyzeProgress struct {
sync.Mutex
// deltaCount is the newly processed rows after the last time mysql.analyze_jobs.processed_rows is updated.
deltaCount int64
// lastDumpTime is the last time mysql.analyze_jobs.processed_rows is updated.
lastDumpTime time.Time
}
// Update adds rowCount to the delta count. If the updated delta count reaches threshold, it returns the delta count for
// dumping it into mysql.analyze_jobs and resets the delta count to 0. Otherwise it returns 0.
func (p *AnalyzeProgress) Update(rowCount int64) (dumpCount int64) {
p.Lock()
defer p.Unlock()
p.deltaCount += rowCount
t := time.Now()
const maxDelta int64 = 10000000
const dumpTimeInterval = 5 * time.Second
if p.deltaCount > maxDelta && t.Sub(p.lastDumpTime) > dumpTimeInterval {
dumpCount = p.deltaCount
p.deltaCount = 0
p.lastDumpTime = t
return
}
return
}
// GetDeltaCount returns the delta count which hasn't been dumped into mysql.analyze_jobs.
func (p *AnalyzeProgress) GetDeltaCount() int64 {
p.Lock()
defer p.Unlock()
return p.deltaCount
}
// SetLastDumpTime sets the last dump time.
func (p *AnalyzeProgress) SetLastDumpTime(t time.Time) {
p.Lock()
defer p.Unlock()
p.lastDumpTime = t
}
// GetLastDumpTime returns the last dump time.
func (p *AnalyzeProgress) GetLastDumpTime() time.Time {
p.Lock()
defer p.Unlock()
return p.lastDumpTime
}
const (
// AnalyzePending means the analyze job is pending
AnalyzePending = "pending"
// AnalyzeRunning means the analyze job is running
AnalyzeRunning = "running"
// AnalyzeFinished means the analyze job has finished
AnalyzeFinished = "finished"
// AnalyzeFailed means the analyze job has failed
AnalyzeFailed = "failed"
)
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