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update.go
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update.go
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// Copyright 2017 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 statistics
import (
"fmt"
"sync"
"time"
log "github.com/Sirupsen/logrus"
"github.com/juju/errors"
"github.com/pingcap/tidb/infoschema"
"github.com/pingcap/tidb/model"
"github.com/pingcap/tidb/sessionctx/variable"
"github.com/pingcap/tidb/store/tikv/oracle"
"github.com/pingcap/tidb/util/sqlexec"
)
type tableDeltaMap map[int64]variable.TableDelta
func (m tableDeltaMap) update(id int64, delta int64, count int64) {
item := m[id]
item.Delta += delta
item.Count += count
m[id] = item
}
func (m tableDeltaMap) merge(handle *SessionStatsCollector) {
handle.Lock()
defer handle.Unlock()
for id, item := range handle.mapper {
m.update(id, item.Delta, item.Count)
}
handle.mapper = make(tableDeltaMap)
}
// SessionStatsCollector is a list item that holds the delta mapper. If you want to write or read mapper, you must lock it.
type SessionStatsCollector struct {
sync.Mutex
mapper tableDeltaMap
prev *SessionStatsCollector
next *SessionStatsCollector
// deleted is set to true when a session is closed. Every time we sweep the list, we will remove the useless collector.
deleted bool
}
// Delete only sets the deleted flag true, it will be deleted from list when DumpStatsDeltaToKV is called.
func (s *SessionStatsCollector) Delete() {
s.Lock()
defer s.Unlock()
s.deleted = true
}
// Update will updates the delta and count for one table id.
func (s *SessionStatsCollector) Update(id int64, delta int64, count int64) {
s.Lock()
defer s.Unlock()
s.mapper.update(id, delta, count)
}
// tryToRemoveFromList will remove this collector from the list if it's deleted flag is set.
func (s *SessionStatsCollector) tryToRemoveFromList() {
s.Lock()
defer s.Unlock()
if !s.deleted {
return
}
next := s.next
prev := s.prev
prev.next = next
if next != nil {
next.prev = prev
}
}
// NewSessionStatsCollector allocates a stats collector for a session.
func (h *Handle) NewSessionStatsCollector() *SessionStatsCollector {
h.listHead.Lock()
defer h.listHead.Unlock()
newCollector := &SessionStatsCollector{
mapper: make(tableDeltaMap),
next: h.listHead.next,
prev: h.listHead,
}
if h.listHead.next != nil {
h.listHead.next.prev = newCollector
}
h.listHead.next = newCollector
return newCollector
}
// DumpStatsDeltaToKV sweeps the whole list and updates the global map. Then we dumps every table that held in map to KV.
func (h *Handle) DumpStatsDeltaToKV() error {
h.listHead.Lock()
for collector := h.listHead.next; collector != nil; collector = collector.next {
collector.tryToRemoveFromList()
h.globalMap.merge(collector)
}
h.listHead.Unlock()
for id, item := range h.globalMap {
updated, err := h.dumpTableStatDeltaToKV(id, item)
if err != nil {
return errors.Trace(err)
}
if updated {
delete(h.globalMap, id)
}
}
return nil
}
// dumpTableStatDeltaToKV dumps a single delta with some table to KV and updates the version.
func (h *Handle) dumpTableStatDeltaToKV(id int64, delta variable.TableDelta) (bool, error) {
if delta.Count == 0 {
return true, nil
}
_, err := h.ctx.(sqlexec.SQLExecutor).Execute("begin")
if err != nil {
return false, errors.Trace(err)
}
var sql string
if delta.Delta < 0 {
sql = fmt.Sprintf("update mysql.stats_meta set version = %d, count = count - %d, modify_count = modify_count + %d where table_id = %d and count >= %d", h.ctx.Txn().StartTS(), -delta.Delta, delta.Count, id, -delta.Delta)
} else {
sql = fmt.Sprintf("update mysql.stats_meta set version = %d, count = count + %d, modify_count = modify_count + %d where table_id = %d", h.ctx.Txn().StartTS(), delta.Delta, delta.Count, id)
}
_, err = h.ctx.(sqlexec.SQLExecutor).Execute(sql)
if err != nil {
return false, errors.Trace(err)
}
updated := h.ctx.GetSessionVars().StmtCtx.AffectedRows() > 0
_, err = h.ctx.(sqlexec.SQLExecutor).Execute("commit")
return updated, errors.Trace(err)
}
const (
// StatsOwnerKey is the stats owner path that is saved to etcd.
StatsOwnerKey = "/tidb/stats/owner"
// StatsPrompt is the prompt for stats owner manager.
StatsPrompt = "stats"
)
func needAnalyzeTable(tbl *Table, limit time.Duration) bool {
if tbl.ModifyCount == 0 {
return false
}
t := time.Unix(0, oracle.ExtractPhysical(tbl.Version)*int64(time.Millisecond))
if time.Since(t) < limit {
return false
}
for _, col := range tbl.Columns {
if len(col.Buckets) > 0 {
return false
}
}
for _, idx := range tbl.Indices {
if len(idx.Buckets) > 0 {
return false
}
}
return true
}
// HandleAutoAnalyze analyzes the newly created table or index.
func (h *Handle) HandleAutoAnalyze(is infoschema.InfoSchema) error {
dbs := is.AllSchemaNames()
for _, db := range dbs {
tbls := is.SchemaTables(model.NewCIStr(db))
for _, tbl := range tbls {
tblInfo := tbl.Meta()
statsTbl := h.GetTableStats(tblInfo.ID)
if statsTbl.Pseudo || statsTbl.Count == 0 {
continue
}
tblName := "`" + db + "`.`" + tblInfo.Name.O + "`"
if needAnalyzeTable(statsTbl, 20*h.Lease) {
sql := fmt.Sprintf("analyze table %s", tblName)
log.Infof("[stats] auto analyze table %s now", tblName)
return errors.Trace(h.execAutoAnalyze(sql))
}
for _, idx := range tblInfo.Indices {
if idx.State != model.StatePublic {
continue
}
if _, ok := statsTbl.Indices[idx.ID]; !ok {
sql := fmt.Sprintf("analyze table %s index `%s`", tblName, idx.Name.O)
log.Infof("[stats] auto analyze index `%s` for table %s now", idx.Name.O, tblName)
return errors.Trace(h.execAutoAnalyze(sql))
}
}
}
}
return nil
}
func (h *Handle) execAutoAnalyze(sql string) error {
startTime := time.Now()
_, _, err := h.ctx.(sqlexec.RestrictedSQLExecutor).ExecRestrictedSQL(h.ctx, sql)
autoAnalyzeHistgram.Observe(time.Since(startTime).Seconds())
if err != nil {
autoAnalyzeCounter.WithLabelValues("failed").Inc()
} else {
autoAnalyzeCounter.WithLabelValues("succ").Inc()
}
return errors.Trace(err)
}