executor: change pessimistic lock wait start for one statement (pingc…

…ap#13922)

ddl/index.go

@@ -980,7 +980,7 @@ func (w *addIndexWorker) backfillIndexInTxn(handleRange reorgIndexTask) (taskCtx
 
 			// Lock the row key to notify us that someone delete or update the row,
 			// then we should not backfill the index of it, otherwise the adding index is redundant.
-			err := txn.LockKeys(context.Background(), nil, 0, kv.LockAlwaysWait, idxRecord.key)
+			err := txn.LockKeys(context.Background(), nil, 0, kv.LockAlwaysWait, time.Now(), idxRecord.key)
 			if err != nil {
 				return errors.Trace(err)
 			}

executor/adapter.go

@@ -530,7 +530,8 @@ func (a *ExecStmt) handlePessimisticDML(ctx context.Context, e Executor) error {
 			return nil
 		}
 		forUpdateTS := txnCtx.GetForUpdateTS()
-		err = txn.LockKeys(ctx, &sctx.GetSessionVars().Killed, forUpdateTS, sctx.GetSessionVars().LockWaitTimeout, keys...)
+		err = txn.LockKeys(ctx, &sctx.GetSessionVars().Killed, forUpdateTS, sctx.GetSessionVars().LockWaitTimeout,
+			sctx.GetSessionVars().StmtCtx.GetLockWaitStartTime(), keys...)
 		if err == nil {
 			return nil
 		}

executor/admin.go

@@ -16,6 +16,7 @@ package executor
 import (
 	"context"
 	"math"
+	"time"
 
 	"github.com/pingcap/parser/ast"
 	"github.com/pingcap/parser/model"
@@ -432,7 +433,7 @@ func (e *RecoverIndexExec) backfillIndexInTxn(ctx context.Context, txn kv.Transa
 		}
 
 		recordKey := e.table.RecordKey(row.handle)
-		err := txn.LockKeys(ctx, nil, 0, kv.LockAlwaysWait, recordKey)
+		err := txn.LockKeys(ctx, nil, 0, kv.LockAlwaysWait, time.Now(), recordKey)
 		if err != nil {
 			return result, err
 		}

executor/executor.go

@@ -835,7 +835,8 @@ func doLockKeys(ctx context.Context, se sessionctx.Context, waitTime int64, keys
 		return err
 	}
 	forUpdateTS := se.GetSessionVars().TxnCtx.GetForUpdateTS()
-	return txn.LockKeys(ctx, &se.GetSessionVars().Killed, forUpdateTS, waitTime, keys...)
+	return txn.LockKeys(ctx, &se.GetSessionVars().Killed, forUpdateTS, waitTime,
+		se.GetSessionVars().StmtCtx.GetLockWaitStartTime(), keys...)
 }
 
 // LimitExec represents limit executor

kv/kv.go

@@ -168,7 +168,8 @@ type Transaction interface {
 	// String implements fmt.Stringer interface.
 	String() string
 	// LockKeys tries to lock the entries with the keys in KV store.
-	LockKeys(ctx context.Context, killed *uint32, forUpdateTS uint64, lockWaitTime int64, keys ...Key) error
+	LockKeys(ctx context.Context, killed *uint32, forUpdateTS uint64,
+		lockWaitTime int64, waitStartTime time.Time, keys ...Key) error
 	// SetOption sets an option with a value, when val is nil, uses the default
 	// value of this option.
 	SetOption(opt Option, val interface{})

kv/mock.go

@@ -15,6 +15,7 @@ package kv
 
 import (
 	"context"
+	"time"
 
 	"github.com/pingcap/tidb/store/tikv/oracle"
 )
@@ -39,7 +40,7 @@ func (t *mockTxn) String() string {
 	return ""
 }
 
-func (t *mockTxn) LockKeys(_ context.Context, _ *uint32, _ uint64, _ int64, _ ...Key) error {
+func (t *mockTxn) LockKeys(_ context.Context, _ *uint32, _ uint64, _ int64, _ time.Time, _ ...Key) error {
 	return nil
 }
 

kv/mock_test.go

@@ -15,6 +15,7 @@ package kv
 
 import (
 	"context"
+	"time"
 
 	. "github.com/pingcap/check"
 )
@@ -38,7 +39,7 @@ func (s testMockSuite) TestInterface(c *C) {
 
 	transaction, err := storage.Begin()
 	c.Check(err, IsNil)
-	err = transaction.LockKeys(context.Background(), nil, 0, LockAlwaysWait, Key("lock"))
+	err = transaction.LockKeys(context.Background(), nil, 0, LockAlwaysWait, time.Now(), Key("lock"))
 	c.Check(err, IsNil)
 	transaction.SetOption(Option(23), struct{}{})
 	if mock, ok := transaction.(*mockTxn); ok {

session/pessimistic_test.go

@@ -718,3 +718,40 @@ func (s *testPessimisticSuite) TestInnodbLockWaitTimeout(c *C) {
 
 	wg.Wait()
 }
+
+func (s *testPessimisticSuite) TestInnodbLockWaitTimeoutWaitStart(c *C) {
+	// prepare work
+	tk := testkit.NewTestKitWithInit(c, s.store)
+	defer tk.MustExec("drop table if exists tk")
+	tk.MustExec("drop table if exists tk")
+	tk.MustExec("create table tk (c1 int primary key, c2 int)")
+	tk.MustExec("insert into tk values(1,1),(2,2),(3,3),(4,4),(5,5)")
+	tk.MustExec("set global innodb_lock_wait_timeout = 1")
+
+	// raise pessimistic transaction in tk2 and trigger failpoint returning ErrWriteConflict
+	tk2 := testkit.NewTestKitWithInit(c, s.store)
+	tk3 := testkit.NewTestKitWithInit(c, s.store)
+	tk2.MustQuery(`show variables like "innodb_lock_wait_timeout"`).Check(testkit.Rows("innodb_lock_wait_timeout 1"))
+
+	// tk3 gets the pessimistic lock
+	tk3.MustExec("begin pessimistic")
+	tk3.MustQuery("select * from tk where c1 = 1 for update")
+
+	tk2.MustExec("begin pessimistic")
+	done := make(chan error)
+	c.Assert(failpoint.Enable("github.com/pingcap/tidb/store/tikv/PessimisticLockErrWriteConflict", "return"), IsNil)
+	start := time.Now()
+	go func() {
+		var err error
+		defer func() {
+			done <- err
+		}()
+		_, err = tk2.Exec("select * from tk where c1 = 1 for update")
+	}()
+	c.Assert(failpoint.Disable("github.com/pingcap/tidb/store/tikv/PessimisticLockErrWriteConflict"), IsNil)
+	waitErr := <-done
+	c.Assert(waitErr, NotNil)
+	c.Check(waitErr.Error(), Equals, tikv.ErrLockWaitTimeout.Error())
+	c.Check(time.Since(start), GreaterEqual, time.Duration(1000*time.Millisecond))
+	c.Check(time.Since(start), LessEqual, time.Duration(1100*time.Millisecond))
+}

sessionctx/stmtctx/stmtctx.go

@@ -140,8 +140,9 @@ type StatementContext struct {
 		normalized string
 		digest     string
 	}
-	Tables    []TableEntry
-	PointExec bool // for point update cached execution, Constant expression need to set "paramMarker"
+	Tables            []TableEntry
+	PointExec         bool       // for point update cached execution, Constant expression need to set "paramMarker"
+	lockWaitStartTime *time.Time // LockWaitStartTime stores the pessimistic lock wait start time
 }
 
 // StmtHints are SessionVars related sql hints.
@@ -584,6 +585,15 @@ func (sc *StatementContext) SetFlagsFromPBFlag(flags uint64) {
 	sc.DividedByZeroAsWarning = (flags & model.FlagDividedByZeroAsWarning) > 0
 }
 
+// GetLockWaitStartTime returns the statement pessimistic lock wait start time
+func (sc *StatementContext) GetLockWaitStartTime() time.Time {
+	if sc.lockWaitStartTime == nil {
+		curTime := time.Now()
+		sc.lockWaitStartTime = &curTime
+	}
+	return *sc.lockWaitStartTime
+}
+
 //CopTasksDetails collects some useful information of cop-tasks during execution.
 type CopTasksDetails struct {
 	NumCopTasks int

store/tikv/2pc.go

@@ -48,8 +48,9 @@ type actionPrewrite struct{}
 type actionCommit struct{}
 type actionCleanup struct{}
 type actionPessimisticLock struct {
-	killed       *uint32
-	lockWaitTime int64
+	killed        *uint32
+	lockWaitTime  int64
+	waitStartTime time.Time
 }
 type actionPessimisticRollback struct{}
 
@@ -687,7 +688,7 @@ func (action actionPessimisticLock) handleSingleBatch(c *twoPhaseCommitter, bo *
 		IsFirstLock:  c.isFirstLock,
 		WaitTimeout:  action.lockWaitTime,
 	}, pb.Context{Priority: c.priority, SyncLog: c.syncLog})
-	lockWaitStartTime := time.Now()
+	lockWaitStartTime := action.waitStartTime
 	for {
 		// if lockWaitTime set, refine the request `WaitTimeout` field based on timeout limit
 		if action.lockWaitTime > 0 {
@@ -698,6 +699,10 @@ func (action actionPessimisticLock) handleSingleBatch(c *twoPhaseCommitter, bo *
 				req.PessimisticLock().WaitTimeout = timeLeft
 			}
 		}
+		failpoint.Inject("PessimisticLockErrWriteConflict", func() error {
+			time.Sleep(300 * time.Millisecond)
+			return kv.ErrWriteConflict
+		})
 		resp, err := c.store.SendReq(bo, req, batch.region, readTimeoutShort)
 		if err != nil {
 			return errors.Trace(err)
@@ -711,7 +716,7 @@ func (action actionPessimisticLock) handleSingleBatch(c *twoPhaseCommitter, bo *
 			if err != nil {
 				return errors.Trace(err)
 			}
-			err = c.pessimisticLockKeys(bo, action.killed, action.lockWaitTime, batch.keys)
+			err = c.pessimisticLockKeys(bo, action.killed, action.lockWaitTime, lockWaitStartTime, batch.keys)
 			return errors.Trace(err)
 		}
 		if resp.Resp == nil {
@@ -1006,8 +1011,8 @@ func (c *twoPhaseCommitter) cleanupKeys(bo *Backoffer, keys [][]byte) error {
 }
 
 func (c *twoPhaseCommitter) pessimisticLockKeys(bo *Backoffer, killed *uint32, lockWaitTime int64,
-	keys [][]byte) error {
-	return c.doActionOnKeys(bo, actionPessimisticLock{killed, lockWaitTime}, keys)
+	waitStartTime time.Time, keys [][]byte) error {
+	return c.doActionOnKeys(bo, actionPessimisticLock{killed, lockWaitTime, waitStartTime}, keys)
 }
 
 func (c *twoPhaseCommitter) pessimisticRollbackKeys(bo *Backoffer, keys [][]byte) error {

store/tikv/2pc_test.go

@@ -561,7 +561,7 @@ func (s *testCommitterSuite) TestUnsetPrimaryKey(c *C) {
 	c.Assert(txn.Set(key, key), IsNil)
 	txn.DelOption(kv.PresumeKeyNotExistsError)
 	txn.DelOption(kv.PresumeKeyNotExists)
-	err := txn.LockKeys(context.Background(), nil, txn.startTS, kv.LockAlwaysWait, key)
+	err := txn.LockKeys(context.Background(), nil, txn.startTS, kv.LockAlwaysWait, time.Now(), key)
 	c.Assert(err, NotNil)
 	c.Assert(txn.Delete(key), IsNil)
 	key2 := kv.Key("key2")
@@ -573,9 +573,9 @@ func (s *testCommitterSuite) TestUnsetPrimaryKey(c *C) {
 func (s *testCommitterSuite) TestPessimisticLockedKeysDedup(c *C) {
 	txn := s.begin(c)
 	txn.SetOption(kv.Pessimistic, true)
-	err := txn.LockKeys(context.Background(), nil, 100, kv.LockAlwaysWait, kv.Key("abc"), kv.Key("def"))
+	err := txn.LockKeys(context.Background(), nil, 100, kv.LockAlwaysWait, time.Now(), kv.Key("abc"), kv.Key("def"))
 	c.Assert(err, IsNil)
-	err = txn.LockKeys(context.Background(), nil, 100, kv.LockAlwaysWait, kv.Key("abc"), kv.Key("def"))
+	err = txn.LockKeys(context.Background(), nil, 100, kv.LockAlwaysWait, time.Now(), kv.Key("abc"), kv.Key("def"))
 	c.Assert(err, IsNil)
 	c.Assert(txn.lockKeys, HasLen, 2)
 }
@@ -585,11 +585,11 @@ func (s *testCommitterSuite) TestPessimisticTTL(c *C) {
 	txn := s.begin(c)
 	txn.SetOption(kv.Pessimistic, true)
 	time.Sleep(time.Millisecond * 100)
-	err := txn.LockKeys(context.Background(), nil, txn.startTS, kv.LockAlwaysWait, key)
+	err := txn.LockKeys(context.Background(), nil, txn.startTS, kv.LockAlwaysWait, time.Now(), key)
 	c.Assert(err, IsNil)
 	time.Sleep(time.Millisecond * 100)
 	key2 := kv.Key("key2")
-	err = txn.LockKeys(context.Background(), nil, txn.startTS, kv.LockAlwaysWait, key2)
+	err = txn.LockKeys(context.Background(), nil, txn.startTS, kv.LockAlwaysWait, time.Now(), key2)
 	c.Assert(err, IsNil)
 	lockInfo := s.getLockInfo(c, key)
 	msBeforeLockExpired := s.store.GetOracle().UntilExpired(txn.StartTS(), lockInfo.LockTtl)
@@ -627,7 +627,7 @@ func (s *testCommitterSuite) TestElapsedTTL(c *C) {
 	txn.SetOption(kv.Pessimistic, true)
 	time.Sleep(time.Millisecond * 100)
 	forUpdateTS := oracle.ComposeTS(oracle.ExtractPhysical(txn.startTS)+100, 1)
-	err := txn.LockKeys(context.Background(), nil, forUpdateTS, kv.LockAlwaysWait, key)
+	err := txn.LockKeys(context.Background(), nil, forUpdateTS, kv.LockAlwaysWait, time.Now(), key)
 	c.Assert(err, IsNil)
 	lockInfo := s.getLockInfo(c, key)
 	c.Assert(lockInfo.LockTtl-ManagedLockTTL, GreaterEqual, uint64(100))

store/tikv/ticlient_test.go

@@ -119,7 +119,7 @@ func (s *testTiclientSuite) TestSingleKey(c *C) {
 	txn := s.beginTxn(c)
 	err := txn.Set(encodeKey(s.prefix, "key"), []byte("value"))
 	c.Assert(err, IsNil)
-	err = txn.LockKeys(context.Background(), nil, 0, kv.LockAlwaysWait, encodeKey(s.prefix, "key"))
+	err = txn.LockKeys(context.Background(), nil, 0, kv.LockAlwaysWait, time.Now(), encodeKey(s.prefix, "key"))
 	c.Assert(err, IsNil)
 	err = txn.Commit(context.Background())
 	c.Assert(err, IsNil)

store/tikv/txn.go

@@ -367,7 +367,8 @@ func (txn *tikvTxn) rollbackPessimisticLocks() error {
 }
 
 // lockWaitTime in ms, except that kv.LockAlwaysWait(0) means always wait lock, kv.LockNowait(-1) means nowait lock
-func (txn *tikvTxn) LockKeys(ctx context.Context, killed *uint32, forUpdateTS uint64, lockWaitTime int64, keysInput ...kv.Key) error {
+func (txn *tikvTxn) LockKeys(ctx context.Context, killed *uint32, forUpdateTS uint64,
+	lockWaitTime int64, waitStartTime time.Time, keysInput ...kv.Key) error {
 	// Exclude keys that are already locked.
 	keys := make([][]byte, 0, len(keysInput))
 	txn.mu.Lock()
@@ -406,7 +407,7 @@ func (txn *tikvTxn) LockKeys(ctx context.Context, killed *uint32, forUpdateTS ui
 		// If the number of keys greater than 1, it can be on different region,
 		// concurrently execute on multiple regions may lead to deadlock.
 		txn.committer.isFirstLock = len(txn.lockKeys) == 0 && len(keys) == 1
-		err := txn.committer.pessimisticLockKeys(bo, killed, lockWaitTime, keys)
+		err := txn.committer.pessimisticLockKeys(bo, killed, lockWaitTime, waitStartTime, keys)
 		if killed != nil {
 			// If the kill signal is received during waiting for pessimisticLock,
 			// pessimisticLockKeys would handle the error but it doesn't reset the flag.