executor: add runtime information for point-get executor (#18666)

executor/builder.go

@@ -31,7 +31,6 @@ import (
 	"github.com/pingcap/parser/ast"
 	"github.com/pingcap/parser/model"
 	"github.com/pingcap/parser/mysql"
-	"github.com/pingcap/tidb/config"
 	"github.com/pingcap/tidb/distsql"
 	"github.com/pingcap/tidb/domain"
 	"github.com/pingcap/tidb/executor/aggfuncs"
@@ -98,9 +97,6 @@ type MockPhysicalPlan interface {
 }
 
 func (b *executorBuilder) build(p plannercore.Plan) Executor {
-	if config.GetGlobalConfig().EnableCollectExecutionInfo && b.ctx.GetSessionVars().StmtCtx.RuntimeStatsColl == nil {
-		b.ctx.GetSessionVars().StmtCtx.RuntimeStatsColl = execdetails.NewRuntimeStatsColl()
-	}
 	switch v := p.(type) {
 	case nil:
 		return nil

executor/executor.go

@@ -1544,10 +1544,11 @@ func ResetContextOfStmt(ctx sessionctx.Context, s ast.StmtNode) (err error) {
 		DiskTracker: disk.NewTracker(stringutil.MemoizeStr(s.Text), -1),
 		TaskID:      stmtctx.AllocateTaskID(),
 	}
-	if config.GetGlobalConfig().OOMUseTmpStorage && GlobalDiskUsageTracker != nil {
+	globalConfig := config.GetGlobalConfig()
+	if globalConfig.OOMUseTmpStorage && GlobalDiskUsageTracker != nil {
 		sc.DiskTracker.AttachToGlobalTracker(GlobalDiskUsageTracker)
 	}
-	switch config.GetGlobalConfig().OOMAction {
+	switch globalConfig.OOMAction {
 	case config.OOMActionCancel:
 		action := &memory.PanicOnExceed{ConnID: ctx.GetSessionVars().ConnectionID}
 		action.SetLogHook(domain.GetDomain(ctx).ExpensiveQueryHandle().LogOnQueryExceedMemQuota)
@@ -1671,6 +1672,10 @@ func ResetContextOfStmt(ctx sessionctx.Context, s ast.StmtNode) (err error) {
 	} else if vars.StmtCtx.InSelectStmt {
 		sc.PrevAffectedRows = -1
 	}
+	if globalConfig.EnableCollectExecutionInfo {
+		sc.RuntimeStatsColl = execdetails.NewRuntimeStatsColl()
+	}
+
 	sc.TblInfo2UnionScan = make(map[*model.TableInfo]bool)
 	errCount, warnCount := vars.StmtCtx.NumErrorWarnings()
 	vars.SysErrorCount = errCount

executor/point_get.go

@@ -21,12 +21,14 @@ import (
 	"github.com/pingcap/parser/mysql"
 	"github.com/pingcap/tidb/kv"
 	plannercore "github.com/pingcap/tidb/planner/core"
+	"github.com/pingcap/tidb/store/tikv"
 	"github.com/pingcap/tidb/table"
 	"github.com/pingcap/tidb/table/tables"
 	"github.com/pingcap/tidb/tablecodec"
 	"github.com/pingcap/tidb/types"
 	"github.com/pingcap/tidb/util/chunk"
 	"github.com/pingcap/tidb/util/codec"
+	"github.com/pingcap/tidb/util/execdetails"
 	"github.com/pingcap/tidb/util/rowcodec"
 )
 
@@ -80,6 +82,8 @@ type PointGetExecutor struct {
 
 	// virtualColumnRetFieldTypes records the RetFieldTypes of virtual columns.
 	virtualColumnRetFieldTypes []*types.FieldType
+
+	stats *pointGetRuntimeStats
 }
 
 // Init set fields needed for PointGetExecutor reuse, this does NOT change baseExecutor field
@@ -117,6 +121,9 @@ func (e *PointGetExecutor) Open(context.Context) error {
 
 // Close implements the Executor interface.
 func (e *PointGetExecutor) Close() error {
+	if e.runtimeStats != nil && e.snapshot != nil {
+		e.snapshot.DelOption(kv.CollectRuntimeStats)
+	}
 	return nil
 }
 
@@ -146,6 +153,15 @@ func (e *PointGetExecutor) Next(ctx context.Context, req *chunk.Chunk) error {
 			return err
 		}
 	}
+	if e.runtimeStats != nil {
+		snapshotStats := &tikv.SnapshotRuntimeStats{}
+		e.stats = &pointGetRuntimeStats{
+			BasicRuntimeStats:    e.runtimeStats,
+			SnapshotRuntimeStats: snapshotStats,
+		}
+		e.snapshot.SetOption(kv.CollectRuntimeStats, snapshotStats)
+		e.ctx.GetSessionVars().StmtCtx.RuntimeStatsColl.RegisterStats(e.id.String(), e.stats)
+	}
 	if e.ctx.GetSessionVars().GetReplicaRead().IsFollowerRead() {
 		e.snapshot.SetOption(kv.ReplicaRead, kv.ReplicaReadFollower)
 	}
@@ -398,3 +414,25 @@ func getColInfoByID(tbl *model.TableInfo, colID int64) *model.ColumnInfo {
 	}
 	return nil
 }
+
+type pointGetRuntimeStats struct {
+	*execdetails.BasicRuntimeStats
+	*tikv.SnapshotRuntimeStats
+}
+
+func (e *pointGetRuntimeStats) String() string {
+	var basic, rpcStatsStr string
+	if e.BasicRuntimeStats != nil {
+		basic = e.BasicRuntimeStats.String()
+	}
+	if e.SnapshotRuntimeStats != nil {
+		rpcStatsStr = e.SnapshotRuntimeStats.String()
+	}
+	if rpcStatsStr == "" {
+		return basic
+	}
+	if basic == "" {
+		return rpcStatsStr
+	}
+	return basic + ", " + rpcStatsStr
+}

kv/kv.go

@@ -56,6 +56,8 @@ const (
 	ReplicaRead
 	// Set task ID
 	TaskID
+	// CollectRuntimeStats is used to enable collect runtime stats.
+	CollectRuntimeStats
 )
 
 // Priority value for transaction priority.

planner/core/integration_test.go

@@ -14,7 +14,9 @@
 package core_test
 
 import (
+	"bytes"
 	"fmt"
+	"strings"
 
 	. "github.com/pingcap/check"
 	"github.com/pingcap/errors"
@@ -1177,3 +1179,20 @@ func (s *testIntegrationSuite) TestIssue16935(c *C) {
 
 	tk.MustQuery("SELECT * FROM t0 LEFT JOIN v0 ON TRUE WHERE v0.c0 IS NULL;")
 }
+
+func (s *testIntegrationSerialSuite) TestExplainAnalyzePointGet(c *C) {
+	tk := testkit.NewTestKit(c, s.store)
+	tk.MustExec("use test")
+	tk.MustExec("drop table if exists t")
+	tk.MustExec("create table t(a int primary key, b varchar(20))")
+	tk.MustExec("insert into t values (1,1)")
+
+	res := tk.MustQuery("explain analyze select * from t where a=1;")
+	resBuff := bytes.NewBufferString("")
+	for _, row := range res.Rows() {
+		fmt.Fprintf(resBuff, "%s\n", row)
+	}
+	explain := resBuff.String()
+	c.Assert(strings.Contains(explain, "Get:{num_rpc:"), IsTrue, Commentf("%s", explain))
+	c.Assert(strings.Contains(explain, "total_time:"), IsTrue, Commentf("%s", explain))
+}

store/tikv/coprocessor.go

@@ -821,13 +821,19 @@ type clientHelper struct {
 	*minCommitTSPushed
 	Client
 	resolveLite bool
+	stats       map[tikvrpc.CmdType]*RegionRequestRuntimeStats
 }
 
 // ResolveLocks wraps the ResolveLocks function and store the resolved result.
 func (ch *clientHelper) ResolveLocks(bo *Backoffer, callerStartTS uint64, locks []*Lock) (int64, error) {
 	var err error
 	var resolvedLocks []uint64
 	var msBeforeTxnExpired int64
+	if ch.stats != nil {
+		defer func(start time.Time) {
+			recordRegionRequestRuntimeStats(ch.stats, tikvrpc.CmdResolveLock, time.Since(start))
+		}(time.Now())
+	}
 	if ch.resolveLite {
 		msBeforeTxnExpired, resolvedLocks, err = ch.LockResolver.resolveLocksLite(bo, callerStartTS, locks)
 	} else {
@@ -849,6 +855,7 @@ func (ch *clientHelper) SendReqCtx(bo *Backoffer, req *tikvrpc.Request, regionID
 	if len(directStoreAddr) > 0 {
 		sender.storeAddr = directStoreAddr
 	}
+	sender.stats = ch.stats
 	req.Context.ResolvedLocks = ch.minCommitTSPushed.Get()
 	resp, ctx, err := sender.SendReqCtx(bo, req, regionID, timeout, sType)
 	return resp, ctx, sender.storeAddr, err

store/tikv/region_request.go

@@ -60,6 +60,14 @@ type RegionRequestSender struct {
 	storeAddr    string
 	rpcError     error
 	failStoreIDs map[uint64]struct{}
+	stats        map[tikvrpc.CmdType]*RegionRequestRuntimeStats
+}
+
+// RegionRequestRuntimeStats records the runtime stats of send region requests.
+type RegionRequestRuntimeStats struct {
+	count int64
+	// Send region request consume time.
+	consume int64
 }
 
 // RegionBatchRequestSender sends BatchCop requests to TiFlash server by stream way.
@@ -78,6 +86,11 @@ func (ss *RegionBatchRequestSender) sendReqToAddr(bo *Backoffer, ctxs []copTaskA
 	if e := tikvrpc.SetContext(req, ctx.Meta, ctx.Peer); e != nil {
 		return nil, false, errors.Trace(e)
 	}
+	if ss.stats != nil {
+		defer func(start time.Time) {
+			recordRegionRequestRuntimeStats(ss.stats, req.Type, time.Since(start))
+		}(time.Now())
+	}
 	resp, err = ss.client.SendRequest(bo.ctx, ctx.Addr, req, timout)
 	if err != nil {
 		ss.rpcError = err
@@ -93,6 +106,19 @@ func (ss *RegionBatchRequestSender) sendReqToAddr(bo *Backoffer, ctxs []copTaskA
 	return
 }
 
+func recordRegionRequestRuntimeStats(stats map[tikvrpc.CmdType]*RegionRequestRuntimeStats, cmd tikvrpc.CmdType, d time.Duration) {
+	stat, ok := stats[cmd]
+	if !ok {
+		stats[cmd] = &RegionRequestRuntimeStats{
+			count:   1,
+			consume: int64(d),
+		}
+		return
+	}
+	stat.count++
+	stat.consume += int64(d)
+}
+
 func (ss *RegionBatchRequestSender) onSendFail(bo *Backoffer, ctx *RPCContext, err error) error {
 	// If it failed because the context is cancelled by ourself, don't retry.
 	if errors.Cause(err) == context.Canceled || status.Code(errors.Cause(err)) == codes.Canceled {
@@ -263,8 +289,13 @@ func (s *RegionRequestSender) sendReqToRegion(bo *Backoffer, ctx *RPCContext, re
 		}
 		defer s.releaseStoreToken(ctx.Store)
 	}
-	resp, err = s.client.SendRequest(bo.ctx, ctx.Addr, req, timeout)
+	if s.stats != nil {
+		defer func(start time.Time) {
+			recordRegionRequestRuntimeStats(s.stats, req.Type, time.Since(start))
+		}(time.Now())
+	}
 
+	resp, err = s.client.SendRequest(bo.ctx, ctx.Addr, req, timeout)
 	if err != nil {
 		s.rpcError = err
 		if e := s.onSendFail(bo, ctx, err); e != nil {

store/tikv/snapshot.go

@@ -73,6 +73,7 @@ type tikvSnapshot struct {
 		sync.RWMutex
 		cached map[string][]byte
 	}
+	stats *SnapshotRuntimeStats
 }
 
 // newTiKVSnapshot creates a snapshot of an TiKV store.
@@ -140,6 +141,7 @@ func (s *tikvSnapshot) BatchGet(ctx context.Context, keys []kv.Key) (map[string]
 		m[string(k)] = v
 		mu.Unlock()
 	})
+	s.recordBackoffInfo(bo)
 	if err != nil {
 		return nil, errors.Trace(err)
 	}
@@ -233,6 +235,12 @@ func (s *tikvSnapshot) batchGetSingleRegion(bo *Backoffer, batch batchKeys, coll
 		minCommitTSPushed: &s.minCommitTSPushed,
 		Client:            s.store.client,
 	}
+	if s.stats != nil {
+		cli.stats = make(map[tikvrpc.CmdType]*RegionRequestRuntimeStats)
+		defer func() {
+			s.mergeRegionRequestStats(cli.stats)
+		}()
+	}
 
 	pending := batch.keys
 	for {
@@ -314,7 +322,9 @@ func (s *tikvSnapshot) Get(ctx context.Context, k kv.Key) ([]byte, error) {
 	}(time.Now())
 
 	ctx = context.WithValue(ctx, txnStartKey, s.version.Ver)
-	val, err := s.get(NewBackofferWithVars(ctx, getMaxBackoff, s.vars), k)
+	bo := NewBackofferWithVars(ctx, getMaxBackoff, s.vars)
+	val, err := s.get(bo, k)
+	s.recordBackoffInfo(bo)
 	if err != nil {
 		return nil, errors.Trace(err)
 	}
@@ -353,6 +363,12 @@ func (s *tikvSnapshot) get(bo *Backoffer, k kv.Key) ([]byte, error) {
 		Client:            s.store.client,
 		resolveLite:       true,
 	}
+	if s.stats != nil {
+		cli.stats = make(map[tikvrpc.CmdType]*RegionRequestRuntimeStats)
+		defer func() {
+			s.mergeRegionRequestStats(cli.stats)
+		}()
+	}
 
 	req := tikvrpc.NewReplicaReadRequest(tikvrpc.CmdGet,
 		&pb.GetRequest{
@@ -431,6 +447,8 @@ func (s *tikvSnapshot) SetOption(opt kv.Option, val interface{}) {
 		s.priority = kvPriorityToCommandPri(val.(int))
 	case kv.TaskID:
 		s.taskID = val.(uint64)
+	case kv.CollectRuntimeStats:
+		s.stats = val.(*SnapshotRuntimeStats)
 	}
 }
 
@@ -439,6 +457,8 @@ func (s *tikvSnapshot) DelOption(opt kv.Option) {
 	switch opt {
 	case kv.ReplicaRead:
 		s.replicaRead = kv.ReplicaReadLeader
+	case kv.CollectRuntimeStats:
+		s.stats = nil
 	}
 }
 
@@ -544,3 +564,66 @@ func prettyWriteKey(buf *bytes.Buffer, key []byte) {
 		logutil.BgLogger().Error("error", zap.Error(err4))
 	}
 }
+
+func (s *tikvSnapshot) recordBackoffInfo(bo *Backoffer) {
+	if s.stats == nil || bo.totalSleep == 0 {
+		return
+	}
+	s.mu.Lock()
+	defer s.mu.Unlock()
+	if s.stats.backoffSleepMS == nil {
+		s.stats.backoffSleepMS = bo.backoffSleepMS
+		s.stats.backoffTimes = bo.backoffTimes
+		return
+	}
+	for k, v := range bo.backoffSleepMS {
+		s.stats.backoffSleepMS[k] += v
+	}
+	for k, v := range bo.backoffTimes {
+		s.stats.backoffTimes[k] += v
+	}
+}
+
+func (s *tikvSnapshot) mergeRegionRequestStats(stats map[tikvrpc.CmdType]*RegionRequestRuntimeStats) {
+	s.mu.Lock()
+	defer s.mu.Unlock()
+	if s.stats.rpcStats == nil {
+		s.stats.rpcStats = stats
+		return
+	}
+	for k, v := range stats {
+		stat, ok := s.stats.rpcStats[k]
+		if !ok {
+			s.stats.rpcStats[k] = v
+			continue
+		}
+		stat.count += v.count
+		stat.consume += v.consume
+	}
+}
+
+// SnapshotRuntimeStats records the runtime stats of snapshot.
+type SnapshotRuntimeStats struct {
+	rpcStats       map[tikvrpc.CmdType]*RegionRequestRuntimeStats
+	backoffSleepMS map[backoffType]int
+	backoffTimes   map[backoffType]int
+}
+
+// String implements fmt.Stringer interface.
+func (rs *SnapshotRuntimeStats) String() string {
+	var buf bytes.Buffer
+	for k, v := range rs.rpcStats {
+		if buf.Len() > 0 {
+			buf.WriteByte(',')
+		}
+		buf.WriteString(fmt.Sprintf("%s:{num_rpc:%d, total_time:%s}", k.String(), v.count, time.Duration(v.consume)))
+	}
+	for k, v := range rs.backoffTimes {
+		if buf.Len() > 0 {
+			buf.WriteByte(',')
+		}
+		ms := rs.backoffSleepMS[k]
+		buf.WriteString(fmt.Sprintf("%s_backoff:{num:%d, total_time:%d ms}", k.String(), v, ms))
+	}
+	return buf.String()
+}