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tikvgc.go
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tikvgc.go
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package db
import (
"context"
"time"
"github.com/distributedio/titan/conf"
"github.com/pingcap/tidb/store/tikv"
"github.com/pingcap/tidb/store/tikv/gcworker"
"github.com/pingcap/tidb/store/tikv/oracle"
"go.uber.org/zap"
)
var (
sysTiKVGCLeader = []byte("$sys:0:TGC:GCLeader")
sysTiKVGCLastSafePoint = []byte("$sys:0:TGC:LastSafePoint")
)
const (
tikvGcTimeFormat = "20060102-15:04:05 -0700 MST"
)
// StartTiKVGC start tikv gcwork
func StartTiKVGC(db *DB, tikvCfg *conf.TiKVGC) {
ticker := time.NewTicker(tikvCfg.Interval)
defer ticker.Stop()
uuid := UUID()
ctx := context.Background()
for range ticker.C {
if tikvCfg.Disable {
continue
}
isLeader, err := isLeader(db, sysTiKVGCLeader, uuid, tikvCfg.LeaderLifeTime)
if err != nil {
zap.L().Error("[TiKVGC] check TiKVGC leader failed", zap.Error(err))
continue
}
if !isLeader {
if logEnv := zap.L().Check(zap.DebugLevel, "[TiKVGC] not TiKVGC leader"); logEnv != nil {
logEnv.Write(zap.ByteString("leader", sysTiKVGCLeader),
zap.ByteString("uuid", uuid),
zap.Duration("leader-life-time", tikvCfg.LeaderLifeTime),
zap.Duration("safe-point-life-time", tikvCfg.SafePointLifeTime),
zap.Int("concurrency", tikvCfg.Concurrency))
}
continue
}
if err := runTiKVGC(ctx, db, uuid, tikvCfg.SafePointLifeTime, tikvCfg.Concurrency); err != nil {
zap.L().Error("[TiKVGC] do TiKVGC failed", zap.Error(err))
continue
}
}
}
func runTiKVGC(ctx context.Context, db *DB, uuid []byte, lifeTime time.Duration, concurrency int) error {
newPoint, err := getNewSafePoint(db, lifeTime)
if err != nil {
return err
}
lastPoint, err := getLastSafePoint(db)
if err != nil {
return err
}
if lastPoint != nil && newPoint.Before(*lastPoint) {
zap.L().Info("[TiKVGC] last safe point is later than current on,no need to gc.",
zap.Time("last", *lastPoint), zap.Time("current", *newPoint))
return nil
}
if lastPoint == nil {
zap.L().Info("[TiKVGC] current safe point ", zap.Time("current", *newPoint))
} else {
zap.L().Info("[TiKVGC] current safe point ", zap.Time("current", *newPoint), zap.Time("last", *lastPoint))
}
if err := saveLastSafePoint(ctx, db, newPoint); err != nil {
zap.L().Error("[TiKVGC] save last safe point err ", zap.Time("current", *newPoint))
return err
}
safePoint := oracle.ComposeTS(oracle.GetPhysical(*newPoint), 0)
if err := gcworker.RunGCJob(ctx, db.kv.Storage.(tikv.Storage), safePoint, UUIDString(uuid), concurrency); err != nil {
return err
}
return nil
}
func saveLastSafePoint(ctx context.Context, db *DB, safePoint *time.Time) error {
txn, err := db.Begin()
if err != nil {
return err
}
if err := txn.t.Set(sysTiKVGCLastSafePoint, []byte(safePoint.Format(tikvGcTimeFormat))); err != nil {
return err
}
if err := txn.t.Commit(ctx); err != nil {
if err := txn.Rollback(); err != nil {
zap.L().Error("rollback failed", zap.Error(err))
}
return err
}
return nil
}
func getNewSafePoint(db *DB, lifeTime time.Duration) (*time.Time, error) {
currentVer, err := db.kv.CurrentVersion()
if err != nil {
return nil, err
}
physical := oracle.ExtractPhysical(currentVer.Ver)
sec, nsec := physical/1e3, (physical%1e3)*1e6
now := time.Unix(sec, nsec)
safePoint := now.Add(-lifeTime)
return &safePoint, nil
}
func getLastSafePoint(db *DB) (*time.Time, error) {
txn, err := db.Begin()
if err != nil {
return nil, err
}
val, err := txn.t.Get(sysTiKVGCLastSafePoint)
if err != nil {
if IsErrNotFound(err) {
return nil, nil
}
return nil, err
}
str := string(val)
if str == "" {
return nil, nil
}
t, err := time.Parse(tikvGcTimeFormat, str)
if err != nil {
return nil, err
}
return &t, nil
}