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pessimistic_test.go
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// 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 session_test
import (
"context"
"fmt"
"strconv"
"strings"
"sync"
"sync/atomic"
"time"
. "github.com/pingcap/check"
"github.com/pingcap/errors"
"github.com/pingcap/failpoint"
"github.com/pingcap/tidb/config"
"github.com/pingcap/tidb/kv"
"github.com/pingcap/tidb/parser"
"github.com/pingcap/tidb/parser/auth"
"github.com/pingcap/tidb/parser/mysql"
"github.com/pingcap/tidb/parser/terror"
plannercore "github.com/pingcap/tidb/planner/core"
"github.com/pingcap/tidb/session"
"github.com/pingcap/tidb/sessionctx/variable"
storeerr "github.com/pingcap/tidb/store/driver/error"
"github.com/tikv/client-go/v2/oracle"
"github.com/tikv/client-go/v2/txnkv/transaction"
"github.com/pingcap/tidb/tablecodec"
"github.com/pingcap/tidb/types"
"github.com/pingcap/tidb/util/codec"
"github.com/pingcap/tidb/util/deadlockhistory"
"github.com/pingcap/tidb/util/testkit"
"github.com/pingcap/tidb/util/testutil"
)
var _ = SerialSuites(&testPessimisticSuite{})
func (s *testPessimisticSuite) newAsyncCommitTestKitWithInit(c *C) *testkit.TestKit {
tk := testkit.NewTestKitWithInit(c, s.store)
tk.Se.GetSessionVars().EnableAsyncCommit = true
return tk
}
func (s *testPessimisticSuite) new1PCTestKitWithInit(c *C) *testkit.TestKit {
tk := testkit.NewTestKitWithInit(c, s.store)
tk.Se.GetSessionVars().Enable1PC = true
return tk
}
type lockTTL uint64
func setLockTTL(v uint64) lockTTL { return lockTTL(atomic.SwapUint64(&transaction.ManagedLockTTL, v)) }
func (v lockTTL) restore() { atomic.StoreUint64(&transaction.ManagedLockTTL, uint64(v)) }
type testPessimisticSuite struct {
testSessionSuiteBase
}
func (s *testPessimisticSuite) SetUpSuite(c *C) {
s.testSessionSuiteBase.SetUpSuite(c)
// Set it to 5s for testing lock resolve.
atomic.StoreUint64(&transaction.ManagedLockTTL, 5000)
transaction.PrewriteMaxBackoff = 500
}
func (s *testPessimisticSuite) TearDownSuite(c *C) {
s.testSessionSuiteBase.TearDownSuite(c)
transaction.PrewriteMaxBackoff = 20000
}
func (s *testPessimisticSuite) TestPessimisticTxn(c *C) {
tk := testkit.NewTestKitWithInit(c, s.store)
// Make the name has different indent for easier read.
tk1 := testkit.NewTestKitWithInit(c, s.store)
tk.MustExec("drop table if exists pessimistic")
tk.MustExec("create table pessimistic (k int, v int)")
tk.MustExec("insert into pessimistic values (1, 1)")
// t1 lock, t2 update, t1 update and retry statement.
tk1.MustExec("begin pessimistic")
tk.MustExec("update pessimistic set v = 2 where v = 1")
// Update can see the change, so this statement affects 0 rows.
tk1.MustExec("update pessimistic set v = 3 where v = 1")
c.Assert(tk1.Se.AffectedRows(), Equals, uint64(0))
c.Assert(session.GetHistory(tk1.Se).Count(), Equals, 0)
// select for update can see the change of another transaction.
tk1.MustQuery("select * from pessimistic for update").Check(testkit.Rows("1 2"))
// plain select can not see the change of another transaction.
tk1.MustQuery("select * from pessimistic").Check(testkit.Rows("1 1"))
tk1.MustExec("update pessimistic set v = 3 where v = 2")
c.Assert(tk1.Se.AffectedRows(), Equals, uint64(1))
// pessimistic lock doesn't block read operation of other transactions.
tk.MustQuery("select * from pessimistic").Check(testkit.Rows("1 2"))
tk1.MustExec("commit")
tk1.MustQuery("select * from pessimistic").Check(testkit.Rows("1 3"))
// t1 lock, t1 select for update, t2 wait t1.
tk1.MustExec("begin pessimistic")
tk1.MustExec("select * from pessimistic where k = 1 for update")
finishCh := make(chan struct{})
go func() {
tk.MustExec("update pessimistic set v = 5 where k = 1")
finishCh <- struct{}{}
}()
time.Sleep(time.Millisecond * 10)
tk1.MustExec("update pessimistic set v = 3 where k = 1")
tk1.MustExec("commit")
<-finishCh
tk.MustQuery("select * from pessimistic").Check(testkit.Rows("1 5"))
}
func (s *testPessimisticSuite) TestTxnMode(c *C) {
tk := testkit.NewTestKitWithInit(c, s.store)
tests := []struct {
beginStmt string
txnMode string
isPessimistic bool
}{
{"pessimistic", "pessimistic", true},
{"pessimistic", "optimistic", true},
{"pessimistic", "", true},
{"optimistic", "pessimistic", false},
{"optimistic", "optimistic", false},
{"optimistic", "", false},
{"", "pessimistic", true},
{"", "optimistic", false},
{"", "", false},
}
for _, tt := range tests {
tk.MustExec(fmt.Sprintf("set @@tidb_txn_mode = '%s'", tt.txnMode))
tk.MustExec("begin " + tt.beginStmt)
c.Check(tk.Se.GetSessionVars().TxnCtx.IsPessimistic, Equals, tt.isPessimistic)
tk.MustExec("rollback")
}
tk.MustExec("set @@autocommit = 0")
tk.MustExec("create table if not exists txn_mode (a int)")
tests2 := []struct {
txnMode string
isPessimistic bool
}{
{"pessimistic", true},
{"optimistic", false},
{"", false},
}
for _, tt := range tests2 {
tk.MustExec(fmt.Sprintf("set @@tidb_txn_mode = '%s'", tt.txnMode))
tk.MustExec("rollback")
tk.MustExec("insert txn_mode values (1)")
c.Check(tk.Se.GetSessionVars().TxnCtx.IsPessimistic, Equals, tt.isPessimistic)
tk.MustExec("rollback")
}
tk.MustExec("set @@global.tidb_txn_mode = 'pessimistic'")
tk1 := testkit.NewTestKitWithInit(c, s.store)
tk1.MustQuery("select @@tidb_txn_mode").Check(testkit.Rows("pessimistic"))
tk1.MustExec("set @@autocommit = 0")
tk1.MustExec("insert txn_mode values (2)")
c.Check(tk1.Se.GetSessionVars().TxnCtx.IsPessimistic, IsTrue)
tk1.MustExec("set @@tidb_txn_mode = ''")
tk1.MustExec("rollback")
tk1.MustExec("insert txn_mode values (2)")
c.Check(tk1.Se.GetSessionVars().TxnCtx.IsPessimistic, IsFalse)
tk1.MustExec("rollback")
}
func (s *testPessimisticSuite) TestDeadlock(c *C) {
deadlockhistory.GlobalDeadlockHistory.Clear()
deadlockhistory.GlobalDeadlockHistory.Resize(10)
tk1 := testkit.NewTestKitWithInit(c, s.store)
// Use the root user so that the statements can be recorded into statements_summary table, which is necessary
// for fetching
c.Assert(tk1.Se.Auth(&auth.UserIdentity{Username: "root", Hostname: "%"}, nil, nil), IsTrue)
tk1.MustExec("drop table if exists deadlock")
tk1.MustExec("create table deadlock (k int primary key, v int)")
tk1.MustExec("insert into deadlock values (1, 1), (2, 1)")
tk1.MustExec("begin pessimistic")
tk1.MustExec("update deadlock set v = v + 1 where k = 1")
ts1, err := strconv.ParseUint(tk1.MustQuery("select @@tidb_current_ts").Rows()[0][0].(string), 10, 64)
c.Assert(err, IsNil)
tk2 := testkit.NewTestKitWithInit(c, s.store)
c.Assert(tk2.Se.Auth(&auth.UserIdentity{Username: "root", Hostname: "%"}, nil, nil), IsTrue)
tk2.MustExec("begin pessimistic")
ts2, err := strconv.ParseUint(tk2.MustQuery("select @@tidb_current_ts").Rows()[0][0].(string), 10, 64)
c.Assert(err, IsNil)
syncCh := make(chan error)
go func() {
tk2.MustExec("update deadlock set v = v + 1 where k = 2")
syncCh <- nil
_, err := tk2.Exec("update deadlock set v = v + 1 where k = 1")
syncCh <- err
tk2.MustExec("rollback")
}()
<-syncCh
_, err1 := tk1.Exec("update deadlock set v = v + 1 where k = 2")
err2 := <-syncCh
// Either err1 or err2 is deadlock error.
if err1 != nil {
c.Assert(err2, IsNil)
err = err1
} else {
err = err2
}
e, ok := errors.Cause(err).(*terror.Error)
c.Assert(ok, IsTrue)
c.Assert(int(e.Code()), Equals, mysql.ErrLockDeadlock)
_, digest := parser.NormalizeDigest("update deadlock set v = v + 1 where k = 1")
expectedDeadlockInfo := []string{
fmt.Sprintf("%v/%v/%v/%v", ts1, ts2, digest, "update `deadlock` set `v` = `v` + ? where `k` = ?"),
fmt.Sprintf("%v/%v/%v/%v", ts2, ts1, digest, "update `deadlock` set `v` = `v` + ? where `k` = ?"),
}
// The last one is the transaction that encountered the deadlock error.
if err1 != nil {
// Swap the two to match the correct order.
expectedDeadlockInfo[0], expectedDeadlockInfo[1] = expectedDeadlockInfo[1], expectedDeadlockInfo[0]
}
res := tk1.MustQuery("select deadlock_id, try_lock_trx_id, trx_holding_lock, current_sql_digest, current_sql_digest_text from information_schema.deadlocks")
res.CheckAt([]int{1, 2, 3, 4}, testutil.RowsWithSep("/", expectedDeadlockInfo...))
c.Assert(res.Rows()[0][0], Equals, res.Rows()[1][0])
}
func (s *testPessimisticSuite) TestSingleStatementRollback(c *C) {
if *withTiKV {
c.Skip("skip with tikv because cluster manipulate is not available")
}
tk := testkit.NewTestKitWithInit(c, s.store)
tk2 := testkit.NewTestKitWithInit(c, s.store)
tk.MustExec("drop table if exists pessimistic")
tk.MustExec("create table single_statement (id int primary key, v int)")
tk.MustExec("insert into single_statement values (1, 1), (2, 1), (3, 1), (4, 1)")
tblID := tk.GetTableID("single_statement")
tableStart := tablecodec.GenTableRecordPrefix(tblID)
s.cluster.SplitKeys(tableStart, tableStart.PrefixNext(), 2)
region1Key := codec.EncodeBytes(nil, tablecodec.EncodeRowKeyWithHandle(tblID, kv.IntHandle(1)))
region1, _, _ := s.cluster.GetRegionByKey(region1Key)
region1ID := region1.Id
region2Key := codec.EncodeBytes(nil, tablecodec.EncodeRowKeyWithHandle(tblID, kv.IntHandle(3)))
region2, _, _ := s.cluster.GetRegionByKey(region2Key)
region2ID := region2.Id
syncCh := make(chan bool)
c.Assert(failpoint.Enable("tikvclient/SingleStmtDeadLockRetrySleep", "return"), IsNil)
go func() {
tk2.MustExec("begin pessimistic")
<-syncCh
// tk2 will go first, so tk will meet deadlock and retry, tk2 will resolve pessimistic rollback
// lock on key 3 after lock ttl
s.cluster.ScheduleDelay(tk2.Se.GetSessionVars().TxnCtx.StartTS, region2ID, time.Millisecond*3)
tk2.MustExec("update single_statement set v = v + 1")
tk2.MustExec("commit")
<-syncCh
}()
tk.MustExec("begin pessimistic")
syncCh <- true
s.cluster.ScheduleDelay(tk.Se.GetSessionVars().TxnCtx.StartTS, region1ID, time.Millisecond*10)
tk.MustExec("update single_statement set v = v + 1")
tk.MustExec("commit")
c.Assert(failpoint.Disable("tikvclient/SingleStmtDeadLockRetrySleep"), IsNil)
syncCh <- true
}
func (s *testPessimisticSuite) TestFirstStatementFail(c *C) {
tk := testkit.NewTestKitWithInit(c, s.store)
tk.MustExec("drop table if exists first")
tk.MustExec("create table first (k int unique)")
tk.MustExec("insert first values (1)")
tk.MustExec("begin pessimistic")
_, err := tk.Exec("insert first values (1)")
c.Assert(err, NotNil)
tk.MustExec("insert first values (2)")
tk.MustExec("commit")
}
func (s *testPessimisticSuite) TestKeyExistsCheck(c *C) {
tk := testkit.NewTestKitWithInit(c, s.store)
tk.MustExec("drop table if exists chk")
tk.MustExec("create table chk (k int primary key)")
tk.MustExec("insert chk values (1)")
tk.MustExec("delete from chk where k = 1")
tk.MustExec("begin pessimistic")
tk.MustExec("insert chk values (1)")
tk.MustExec("commit")
tk1 := testkit.NewTestKitWithInit(c, s.store)
tk1.MustExec("begin optimistic")
tk1.MustExec("insert chk values (1), (2), (3)")
_, err := tk1.Exec("commit")
c.Assert(err, NotNil)
tk.MustExec("begin pessimistic")
tk.MustExec("insert chk values (2)")
tk.MustExec("commit")
}
func (s *testPessimisticSuite) TestInsertOnDup(c *C) {
tk := testkit.NewTestKitWithInit(c, s.store)
tk2 := testkit.NewTestKitWithInit(c, s.store)
tk.MustExec("drop table if exists dup")
tk.MustExec("create table dup (id int primary key, c int)")
tk.MustExec("begin pessimistic")
tk2.MustExec("insert dup values (1, 1)")
tk.MustExec("insert dup values (1, 1) on duplicate key update c = c + 1")
tk.MustExec("commit")
tk.MustQuery("select * from dup").Check(testkit.Rows("1 2"))
}
func (s *testPessimisticSuite) TestPointGetOverflow(c *C) {
tk := testkit.NewTestKitWithInit(c, s.store)
tk.MustExec("create table t(k tinyint, v int, unique key(k))")
tk.MustExec("begin pessimistic")
tk.MustExec("update t set v = 100 where k = -200;")
tk.MustExec("update t set v = 100 where k in (-200, -400);")
}
func (s *testPessimisticSuite) TestPointGetKeyLock(c *C) {
tk := testkit.NewTestKitWithInit(c, s.store)
tk2 := testkit.NewTestKitWithInit(c, s.store)
tk.MustExec("drop table if exists point")
tk.MustExec("create table point (id int primary key, u int unique, c int)")
syncCh := make(chan struct{})
tk.MustExec("begin pessimistic")
tk.MustExec("update point set c = c + 1 where id = 1")
tk.MustExec("delete from point where u = 2")
go func() {
tk2.MustExec("begin pessimistic")
_, err1 := tk2.Exec("insert point values (1, 1, 1)")
c.Check(kv.ErrKeyExists.Equal(err1), IsTrue)
_, err1 = tk2.Exec("insert point values (2, 2, 2)")
c.Check(kv.ErrKeyExists.Equal(err1), IsTrue)
tk2.MustExec("rollback")
<-syncCh
}()
time.Sleep(time.Millisecond * 10)
tk.MustExec("insert point values (1, 1, 1)")
tk.MustExec("insert point values (2, 2, 2)")
tk.MustExec("commit")
syncCh <- struct{}{}
tk.MustExec("begin pessimistic")
tk.MustExec("select * from point where id = 3 for update")
tk.MustExec("select * from point where u = 4 for update")
go func() {
tk2.MustExec("begin pessimistic")
_, err1 := tk2.Exec("insert point values (3, 3, 3)")
c.Check(kv.ErrKeyExists.Equal(err1), IsTrue)
_, err1 = tk2.Exec("insert point values (4, 4, 4)")
c.Check(kv.ErrKeyExists.Equal(err1), IsTrue)
tk2.MustExec("rollback")
<-syncCh
}()
time.Sleep(time.Millisecond * 10)
tk.MustExec("insert point values (3, 3, 3)")
tk.MustExec("insert point values (4, 4, 4)")
tk.MustExec("commit")
syncCh <- struct{}{}
}
func (s *testPessimisticSuite) TestBankTransfer(c *C) {
tk := testkit.NewTestKitWithInit(c, s.store)
tk2 := testkit.NewTestKitWithInit(c, s.store)
tk.MustExec("drop table if exists accounts")
tk.MustExec("create table accounts (id int primary key, c int)")
tk.MustExec("insert accounts values (1, 100), (2, 100), (3, 100)")
syncCh := make(chan struct{})
tk.MustExec("begin pessimistic")
tk.MustQuery("select * from accounts where id = 1 for update").Check(testkit.Rows("1 100"))
go func() {
tk2.MustExec("begin pessimistic")
tk2.MustExec("select * from accounts where id = 2 for update")
<-syncCh
tk2.MustExec("select * from accounts where id = 3 for update")
tk2.MustExec("update accounts set c = 50 where id = 2")
tk2.MustExec("update accounts set c = 150 where id = 3")
tk2.MustExec("commit")
<-syncCh
}()
syncCh <- struct{}{}
tk.MustQuery("select * from accounts where id = 2 for update").Check(testkit.Rows("2 50"))
tk.MustExec("update accounts set c = 50 where id = 1")
tk.MustExec("update accounts set c = 100 where id = 2")
tk.MustExec("commit")
syncCh <- struct{}{}
tk.MustQuery("select sum(c) from accounts").Check(testkit.Rows("300"))
}
func (s *testPessimisticSuite) TestLockUnchangedRowKey(c *C) {
tk := testkit.NewTestKitWithInit(c, s.store)
tk2 := testkit.NewTestKitWithInit(c, s.store)
tk.MustExec("drop table if exists unchanged")
tk.MustExec("create table unchanged (id int primary key, c int)")
tk.MustExec("insert unchanged values (1, 1), (2, 2)")
tk.MustExec("begin pessimistic")
tk.MustExec("update unchanged set c = 1 where id < 2")
tk2.MustExec("begin pessimistic")
err := tk2.ExecToErr("select * from unchanged where id = 1 for update nowait")
c.Assert(err, NotNil)
tk.MustExec("rollback")
tk2.MustQuery("select * from unchanged where id = 1 for update nowait")
tk.MustExec("begin pessimistic")
tk.MustExec("insert unchanged values (2, 2) on duplicate key update c = values(c)")
err = tk2.ExecToErr("select * from unchanged where id = 2 for update nowait")
c.Assert(err, NotNil)
tk.MustExec("commit")
tk2.MustQuery("select * from unchanged where id = 1 for update nowait")
tk2.MustExec("rollback")
}
func (s *testPessimisticSuite) TestOptimisticConflicts(c *C) {
tk := testkit.NewTestKitWithInit(c, s.store)
tk2 := testkit.NewTestKitWithInit(c, s.store)
tk.MustExec("drop table if exists conflict")
tk.MustExec("create table conflict (id int primary key, c int)")
tk.MustExec("insert conflict values (1, 1)")
tk.MustExec("begin pessimistic")
tk.MustQuery("select * from conflict where id = 1 for update")
syncCh := make(chan struct{})
go func() {
tk2.MustExec("update conflict set c = 3 where id = 1")
<-syncCh
}()
time.Sleep(time.Millisecond * 10)
tk.MustExec("update conflict set c = 2 where id = 1")
tk.MustExec("commit")
syncCh <- struct{}{}
tk.MustQuery("select c from conflict where id = 1").Check(testkit.Rows("3"))
// Check pessimistic lock is not resolved.
tk.MustExec("begin pessimistic")
tk.MustExec("update conflict set c = 4 where id = 1")
tk2.MustExec("begin optimistic")
tk2.MustExec("update conflict set c = 5 where id = 1")
_, err := tk2.Exec("commit")
c.Check(err, NotNil)
tk.MustExec("rollback")
// Update snapshotTS after a conflict, invalidate snapshot cache.
tk.MustExec("truncate table conflict")
tk.MustExec("insert into conflict values (1, 2)")
tk.MustExec("begin pessimistic")
// This SQL use BatchGet and cache data in the txn snapshot.
// It can be changed to other SQLs that use BatchGet.
tk.MustExec("insert ignore into conflict values (1, 2)")
tk2.MustExec("update conflict set c = c - 1")
// Make the txn update its forUpdateTS.
tk.MustQuery("select * from conflict where id = 1 for update").Check(testkit.Rows("1 1"))
// Cover a bug that the txn snapshot doesn't invalidate cache after ts change.
tk.MustExec("insert into conflict values (1, 999) on duplicate key update c = c + 2")
tk.MustExec("commit")
tk.MustQuery("select * from conflict").Check(testkit.Rows("1 3"))
}
func (s *testPessimisticSuite) TestSelectForUpdateNoWait(c *C) {
tk := testkit.NewTestKitWithInit(c, s.store)
tk2 := testkit.NewTestKitWithInit(c, s.store)
tk3 := testkit.NewTestKitWithInit(c, s.store)
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 @@autocommit = 0")
tk2.MustExec("set @@autocommit = 0")
tk3.MustExec("set @@autocommit = 0")
// point get with no autocommit
tk.MustExec("begin pessimistic")
tk.MustExec("select * from tk where c1 = 2 for update") // lock succ
tk2.MustExec("begin pessimistic")
_, err := tk2.Exec("select * from tk where c1 = 2 for update nowait")
c.Check(err, NotNil)
tk.MustExec("commit")
tk2.MustExec("select * from tk where c1 = 2 for update nowait") // lock succ
tk3.MustExec("begin pessimistic")
_, err = tk3.Exec("select * from tk where c1 = 2 for update nowait")
c.Check(err, NotNil)
tk2.MustExec("commit")
tk3.MustExec("select * from tk where c1 = 2 for update")
tk3.MustExec("commit")
tk.MustExec("commit")
tk3.MustExec("begin pessimistic")
tk3.MustExec("update tk set c2 = c2 + 1 where c1 = 3")
tk2.MustExec("begin pessimistic")
_, err = tk2.Exec("select * from tk where c1 = 3 for update nowait")
c.Check(err, NotNil)
tk3.MustExec("commit")
tk2.MustExec("select * from tk where c1 = 3 for update nowait")
tk2.MustExec("commit")
tk.MustExec("commit")
tk2.MustExec("commit")
tk3.MustExec("commit")
// scan with no autocommit
tk.MustExec("begin pessimistic")
tk.MustExec("select * from tk where c1 >= 2 for update")
tk2.MustExec("begin pessimistic")
_, err = tk2.Exec("select * from tk where c1 = 2 for update nowait")
c.Check(err, NotNil)
_, err = tk2.Exec("select * from tk where c1 > 3 for update nowait")
c.Check(err, NotNil)
tk2.MustExec("select * from tk where c1 = 1 for update nowait")
tk2.MustExec("commit")
tk.MustQuery("select * from tk where c1 >= 2 for update").Check(testkit.Rows("2 2", "3 4", "4 4", "5 5"))
tk.MustExec("commit")
tk.MustExec("begin pessimistic")
tk.MustExec("update tk set c2 = c2 + 10 where c1 > 3")
tk3.MustExec("begin pessimistic")
_, err = tk3.Exec("select * from tk where c1 = 5 for update nowait")
c.Check(err, NotNil)
tk3.MustExec("select * from tk where c1 = 1 for update nowait")
tk.MustExec("commit")
tk3.MustQuery("select * from tk where c1 > 3 for update nowait").Check(testkit.Rows("4 14", "5 15"))
tk3.MustExec("commit")
// delete
tk3.MustExec("begin pessimistic")
tk3.MustExec("delete from tk where c1 <= 2")
tk.MustExec("begin pessimistic")
_, err = tk.Exec("select * from tk where c1 = 1 for update nowait")
c.Check(err, NotNil)
tk3.MustExec("commit")
tk.MustQuery("select * from tk where c1 > 1 for update nowait").Check(testkit.Rows("3 4", "4 14", "5 15"))
tk.MustExec("update tk set c2 = c2 + 1 where c1 = 5")
tk2.MustExec("begin pessimistic")
_, err = tk2.Exec("select * from tk where c1 = 5 for update nowait")
c.Check(err, NotNil)
tk.MustExec("commit")
tk2.MustQuery("select * from tk where c1 = 5 for update nowait").Check(testkit.Rows("5 16"))
tk2.MustExec("update tk set c2 = c2 + 1 where c1 = 5")
tk2.MustQuery("select * from tk where c1 = 5 for update nowait").Check(testkit.Rows("5 17"))
tk2.MustExec("commit")
}
func (s *testPessimisticSuite) TestAsyncRollBackNoWait(c *C) {
tk := testkit.NewTestKitWithInit(c, s.store)
tk2 := testkit.NewTestKitWithInit(c, s.store)
tk3 := testkit.NewTestKitWithInit(c, s.store)
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),(5,17)")
tk.MustExec("set @@autocommit = 0")
tk2.MustExec("set @@autocommit = 0")
tk3.MustExec("set @@autocommit = 0")
// test get ts failed for handlePessimisticLockError when using nowait
// even though async rollback for pessimistic lock may rollback later locked key if get ts failed from pd
// the txn correctness should be ensured
c.Assert(failpoint.Enable("github.com/pingcap/tidb/executor/ExecStmtGetTsError", "return"), IsNil)
c.Assert(failpoint.Enable("tikvclient/beforeAsyncPessimisticRollback", "sleep(100)"), IsNil)
defer func() {
c.Assert(failpoint.Disable("github.com/pingcap/tidb/executor/ExecStmtGetTsError"), IsNil)
c.Assert(failpoint.Disable("tikvclient/beforeAsyncPessimisticRollback"), IsNil)
}()
tk.MustExec("begin pessimistic")
tk.MustExec("select * from tk where c1 > 0 for update nowait")
tk2.MustExec("begin pessimistic")
// The lock rollback of this statement is delayed by failpoint beforeAsyncPessimisticRollback.
_, err := tk2.Exec("select * from tk where c1 > 0 for update nowait")
c.Check(err, NotNil)
tk.MustExec("commit")
// This statement success for now, but its lock will be rollbacked later by the
// lingering rollback request, as forUpdateTS doesn't change.
tk2.MustQuery("select * from tk where c1 > 0 for update nowait").Check(testkit.Rows("1 1", "2 2", "3 3", "4 4", "5 17"))
tk2.MustQuery("select * from tk where c1 = 5 for update nowait").Check(testkit.Rows("5 17"))
tk3.MustExec("begin pessimistic")
// TODO: @coocood skip the following test in https://github.com/pingcap/tidb/pull/13553/
// Remove this code block and figure out why it's skipped.
// ----------------------
tk2.MustExec("rollback")
tk3.MustExec("rollback")
// ----------------------
c.Skip("tk3 is blocking because tk2 didn't rollback itself")
// tk3 succ because tk2 rollback itself.
tk3.MustExec("update tk set c2 = 1 where c1 = 5")
// This will not take effect because the lock of tk2 was gone.
tk2.MustExec("update tk set c2 = c2 + 100 where c1 > 0")
_, err = tk2.Exec("commit")
c.Check(err, NotNil) // txn abort because pessimistic lock not found
tk3.MustExec("commit")
tk3.MustExec("begin pessimistic")
tk3.MustQuery("select * from tk where c1 = 5 for update nowait").Check(testkit.Rows("5 1"))
tk3.MustQuery("select * from tk where c1 = 4 for update nowait").Check(testkit.Rows("4 4"))
tk3.MustQuery("select * from tk where c1 = 3 for update nowait").Check(testkit.Rows("3 3"))
tk3.MustExec("commit")
}
func (s *testPessimisticSuite) TestWaitLockKill(c *C) {
// Test kill command works on waiting pessimistic lock.
tk := testkit.NewTestKitWithInit(c, s.store)
tk2 := testkit.NewTestKitWithInit(c, s.store)
tk.MustExec("drop table if exists test_kill")
tk.MustExec("create table test_kill (id int primary key, c int)")
tk.MustExec("insert test_kill values (1, 1)")
tk.MustExec("begin pessimistic")
tk2.MustExec("set innodb_lock_wait_timeout = 50")
tk2.MustExec("begin pessimistic")
tk.MustQuery("select * from test_kill where id = 1 for update")
var wg sync.WaitGroup
wg.Add(1)
go func() {
time.Sleep(500 * time.Millisecond)
sessVars := tk2.Se.GetSessionVars()
succ := atomic.CompareAndSwapUint32(&sessVars.Killed, 0, 1)
c.Assert(succ, IsTrue)
wg.Wait()
}()
_, err := tk2.Exec("update test_kill set c = c + 1 where id = 1")
wg.Done()
c.Assert(err, NotNil)
c.Assert(terror.ErrorEqual(err, storeerr.ErrQueryInterrupted), IsTrue)
tk.MustExec("rollback")
}
func (s *testPessimisticSuite) TestKillStopTTLManager(c *C) {
// Test killing an idle pessimistic session stop its ttlManager.
defer setLockTTL(300).restore()
tk := testkit.NewTestKitWithInit(c, s.store)
tk2 := testkit.NewTestKitWithInit(c, s.store)
tk.MustExec("drop table if exists test_kill")
tk.MustExec("create table test_kill (id int primary key, c int)")
tk.MustExec("insert test_kill values (1, 1)")
tk.MustExec("begin pessimistic")
tk2.MustExec("begin pessimistic")
tk.MustQuery("select * from test_kill where id = 1 for update")
sessVars := tk.Se.GetSessionVars()
succ := atomic.CompareAndSwapUint32(&sessVars.Killed, 0, 1)
c.Assert(succ, IsTrue)
// This query should success rather than returning a ResolveLock error.
tk2.MustExec("update test_kill set c = c + 1 where id = 1")
succ = atomic.CompareAndSwapUint32(&sessVars.Killed, 1, 0)
c.Assert(succ, IsTrue)
tk.MustExec("rollback")
tk2.MustExec("rollback")
}
func (s *testPessimisticSuite) TestConcurrentInsert(c *C) {
tk := testkit.NewTestKitWithInit(c, s.store)
tk.MustExec("drop table if exists tk")
tk.MustExec("create table tk (c1 int primary key, c2 int)")
tk.MustExec("insert tk values (1, 1)")
tk.MustExec("create table tk1 (c1 int, c2 int)")
tk1 := testkit.NewTestKitWithInit(c, s.store)
tk1.MustExec("begin pessimistic")
tk2 := testkit.NewTestKitWithInit(c, s.store)
forUpdateTsA := tk1.Se.GetSessionVars().TxnCtx.GetForUpdateTS()
tk1.MustQuery("select * from tk where c1 = 1 for update")
forUpdateTsB := tk1.Se.GetSessionVars().TxnCtx.GetForUpdateTS()
c.Assert(forUpdateTsA, Equals, forUpdateTsB)
tk1.MustQuery("select * from tk where c1 > 0 for update")
forUpdateTsC := tk1.Se.GetSessionVars().TxnCtx.GetForUpdateTS()
c.Assert(forUpdateTsC, Greater, forUpdateTsB)
tk2.MustExec("insert tk values (2, 2)")
tk1.MustQuery("select * from tk for update").Check(testkit.Rows("1 1", "2 2"))
tk2.MustExec("insert tk values (3, 3)")
tk1.MustExec("update tk set c2 = c2 + 1")
c.Assert(tk1.Se.AffectedRows(), Equals, uint64(3))
tk2.MustExec("insert tk values (4, 4)")
tk1.MustExec("delete from tk")
c.Assert(tk1.Se.AffectedRows(), Equals, uint64(4))
tk2.MustExec("insert tk values (5, 5)")
tk1.MustExec("insert into tk1 select * from tk")
c.Assert(tk1.Se.AffectedRows(), Equals, uint64(1))
tk2.MustExec("insert tk values (6, 6)")
tk1.MustExec("replace into tk1 select * from tk")
c.Assert(tk1.Se.AffectedRows(), Equals, uint64(2))
tk2.MustExec("insert tk values (7, 7)")
// This test is used to test when the selectPlan is a PointGetPlan, and we didn't update its forUpdateTS.
tk1.MustExec("insert into tk1 select * from tk where c1 = 7")
c.Assert(tk1.Se.AffectedRows(), Equals, uint64(1))
tk1.MustExec("commit")
}
func (s *testPessimisticSuite) TestInnodbLockWaitTimeout(c *C) {
tk := testkit.NewTestKitWithInit(c, s.store)
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 set global
tk.MustExec("set global innodb_lock_wait_timeout = 3")
tk.MustQuery(`show variables like "innodb_lock_wait_timeout"`).Check(testkit.Rows("innodb_lock_wait_timeout 50"))
tk2 := testkit.NewTestKitWithInit(c, s.store)
tk2.MustQuery(`show variables like "innodb_lock_wait_timeout"`).Check(testkit.Rows("innodb_lock_wait_timeout 3"))
tk2.MustExec("set innodb_lock_wait_timeout = 2")
tk2.MustQuery(`show variables like "innodb_lock_wait_timeout"`).Check(testkit.Rows("innodb_lock_wait_timeout 2"))
tk3 := testkit.NewTestKitWithInit(c, s.store)
tk3.MustQuery(`show variables like "innodb_lock_wait_timeout"`).Check(testkit.Rows("innodb_lock_wait_timeout 3"))
tk3.MustExec("set innodb_lock_wait_timeout = 1")
tk3.MustQuery(`show variables like "innodb_lock_wait_timeout"`).Check(testkit.Rows("innodb_lock_wait_timeout 1"))
tk2.MustExec("set @@autocommit = 0")
tk3.MustExec("set @@autocommit = 0")
tk4 := testkit.NewTestKitWithInit(c, s.store)
tk4.MustQuery(`show variables like "innodb_lock_wait_timeout"`).Check(testkit.Rows("innodb_lock_wait_timeout 3"))
tk4.MustExec("set @@autocommit = 0")
// tk2 lock c1 = 1
tk2.MustExec("begin pessimistic")
tk2.MustExec("select * from tk where c1 = 1 for update") // lock succ c1 = 1
// Parallel the blocking tests to accelerate CI.
var wg sync.WaitGroup
wg.Add(2)
timeoutErrCh := make(chan error, 2)
go func() {
defer wg.Done()
// tk3 try lock c1 = 1 timeout 1sec
tk3.MustExec("begin pessimistic")
_, err := tk3.Exec("select * from tk where c1 = 1 for update")
timeoutErrCh <- err
tk3.MustExec("commit")
}()
go func() {
defer wg.Done()
// tk5 try lock c1 = 1 timeout 2sec
tk5 := testkit.NewTestKitWithInit(c, s.store)
tk5.MustExec("set innodb_lock_wait_timeout = 2")
tk5.MustExec("begin pessimistic")
_, err := tk5.Exec("update tk set c2 = c2 - 1 where c1 = 1")
timeoutErrCh <- err
tk5.MustExec("rollback")
}()
timeoutErr := <-timeoutErrCh
c.Assert(timeoutErr, NotNil)
c.Assert(timeoutErr.Error(), Equals, storeerr.ErrLockWaitTimeout.Error())
timeoutErr = <-timeoutErrCh
c.Assert(timeoutErr, NotNil)
c.Assert(timeoutErr.Error(), Equals, storeerr.ErrLockWaitTimeout.Error())
// tk4 lock c1 = 2
tk4.MustExec("begin pessimistic")
tk4.MustExec("update tk set c2 = c2 + 1 where c1 = 2") // lock succ c1 = 2 by update
tk2.MustExec("set innodb_lock_wait_timeout = 1")
tk2.MustQuery(`show variables like "innodb_lock_wait_timeout"`).Check(testkit.Rows("innodb_lock_wait_timeout 1"))
start := time.Now()
_, err := tk2.Exec("delete from tk where c1 = 2")
c.Check(time.Since(start), GreaterEqual, 1000*time.Millisecond)
c.Check(time.Since(start), Less, 3000*time.Millisecond) // unit test diff should not be too big
c.Check(err.Error(), Equals, storeerr.ErrLockWaitTimeout.Error())
tk4.MustExec("commit")
tk.MustQuery(`show variables like "innodb_lock_wait_timeout"`).Check(testkit.Rows("innodb_lock_wait_timeout 50"))
tk.MustQuery(`select * from tk where c1 = 2`).Check(testkit.Rows("2 3")) // tk4 update commit work, tk2 delete should be rollbacked
// test stmtRollBack caused by timeout but not the whole transaction
tk2.MustExec("update tk set c2 = c2 + 2 where c1 = 2") // tk2 lock succ c1 = 2 by update
tk2.MustQuery(`select * from tk where c1 = 2`).Check(testkit.Rows("2 5")) // tk2 update c2 succ
tk3.MustExec("begin pessimistic")
tk3.MustExec("select * from tk where c1 = 3 for update") // tk3 lock c1 = 3 succ
start = time.Now()
_, err = tk2.Exec("delete from tk where c1 = 3") // tk2 tries to lock c1 = 3 fail, this delete should be rollback, but previous update should be keeped
c.Check(time.Since(start), GreaterEqual, 1000*time.Millisecond)
c.Check(time.Since(start), Less, 3000*time.Millisecond) // unit test diff should not be too big
c.Check(err.Error(), Equals, storeerr.ErrLockWaitTimeout.Error())
tk2.MustExec("commit")
tk3.MustExec("commit")
tk.MustQuery(`select * from tk where c1 = 1`).Check(testkit.Rows("1 1"))
tk.MustQuery(`select * from tk where c1 = 2`).Check(testkit.Rows("2 5")) // tk2 update succ
tk.MustQuery(`select * from tk where c1 = 3`).Check(testkit.Rows("3 3")) // tk2 delete should fail
tk.MustQuery(`select * from tk where c1 = 4`).Check(testkit.Rows("4 4"))
tk.MustQuery(`select * from tk where c1 = 5`).Check(testkit.Rows("5 5"))
// clean
tk.MustExec("drop table if exists tk")
tk4.MustExec("commit")
wg.Wait()
}
func (s *testPessimisticSuite) TestPushConditionCheckForPessimisticTxn(c *C) {
tk := testkit.NewTestKitWithInit(c, s.store)
tk1 := testkit.NewTestKitWithInit(c, s.store)
defer tk.MustExec("drop table if exists t")
tk.MustExec("drop table if exists t")
tk.MustExec("create table t (i int key)")
tk.MustExec("insert into t values (1)")
tk.MustExec("set tidb_txn_mode = 'pessimistic'")
tk.MustExec("begin")
tk1.MustExec("delete from t where i = 1")
tk.MustExec("insert into t values (1) on duplicate key update i = values(i)")
tk.MustExec("commit")
tk.MustQuery("select * from t").Check(testkit.Rows("1"))
}
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("tikvclient/PessimisticLockErrWriteConflict", "return"), IsNil)
var duration time.Duration
go func() {
var err error
start := time.Now()
defer func() {
duration = time.Since(start)
done <- err
}()
_, err = tk2.Exec("select * from tk where c1 = 1 for update")
}()
time.Sleep(time.Millisecond * 100)
c.Assert(failpoint.Disable("tikvclient/PessimisticLockErrWriteConflict"), IsNil)
waitErr := <-done
c.Assert(waitErr, NotNil)
c.Check(waitErr.Error(), Equals, storeerr.ErrLockWaitTimeout.Error())
c.Check(duration, GreaterEqual, 1000*time.Millisecond)
c.Check(duration, LessEqual, 3000*time.Millisecond)
tk2.MustExec("rollback")
tk3.MustExec("commit")
}
func (s *testPessimisticSuite) TestBatchPointGetWriteConflict(c *C) {
tk := testkit.NewTestKitWithInit(c, s.store)
tk.MustExec("use test")
tk1 := testkit.NewTestKitWithInit(c, s.store)
tk1.MustExec("use test")
tk.MustExec("drop table if exists t;")
tk.MustExec("create table t (i int primary key, c int);")
tk.MustExec("insert t values (1, 1), (2, 2), (3, 3)")
tk1.MustExec("begin pessimistic")
tk1.MustQuery("select * from t where i = 1").Check(testkit.Rows("1 1"))
tk.MustExec("update t set c = c + 1")
tk1.MustQuery("select * from t where i in (1, 3) for update").Check(testkit.Rows("1 2", "3 4"))
tk1.MustExec("commit")
}
func (s *testPessimisticSuite) TestPessimisticSerializable(c *C) {
tk := testkit.NewTestKitWithInit(c, s.store)
tk.MustExec("use test")
tk1 := testkit.NewTestKitWithInit(c, s.store)
tk1.MustExec("use test")
tk.MustExec("set tidb_txn_mode = 'pessimistic'")
tk1.MustExec("set tidb_txn_mode = 'pessimistic'")
tk.MustExec("drop table if exists test;")
tk.MustExec("create table test (id int not null primary key, value int);")
tk.MustExec("insert into test (id, value) values (1, 10);")
tk.MustExec("insert into test (id, value) values (2, 20);")
tk.MustExec("set tidb_skip_isolation_level_check = 1")
tk1.MustExec("set tidb_skip_isolation_level_check = 1")
tk.MustExec("set tx_isolation = 'SERIALIZABLE'")
tk1.MustExec("set tx_isolation = 'SERIALIZABLE'")
// Predicate-Many-Preceders (PMP)
tk.MustExec("begin")
tk1.MustExec("begin")
tk.MustQuery("select * from test where value = 30;").Check(testkit.Rows())
tk1.MustExec("insert into test (id, value) values(3, 30);")
tk1.MustExec("commit")
tk.MustQuery("select * from test where mod(value, 3) = 0;").Check(testkit.Rows())
tk.MustExec("commit")
tk.MustExec("truncate table test;")
tk.MustExec("insert into test (id, value) values (1, 10);")
tk.MustExec("insert into test (id, value) values (2, 20);")
tk.MustExec("begin;")
tk1.MustExec("begin;")
tk.MustExec("update test set value = value + 10;")
var wg sync.WaitGroup
wg.Add(1)
go func() {
tk1.ExecToErr("delete from test where value = 20;")
wg.Done()
}()
tk.MustExec("commit;")
wg.Wait()
tk1.MustExec("rollback;")
// Lost Update (P4)
tk.MustExec("truncate table test;")
tk.MustExec("insert into test (id, value) values (1, 10);")
tk.MustExec("insert into test (id, value) values (2, 20);")
tk.MustExec("begin;")
tk1.MustExec("begin;")
tk.MustQuery("select * from test where id = 1;").Check(testkit.Rows("1 10"))
tk1.MustQuery("select * from test where id = 1;").Check(testkit.Rows("1 10"))
tk.MustExec("update test set value = 11 where id = 1;")
wg.Add(1)
go func() {
tk1.ExecToErr("update test set value = 11 where id = 1;")
wg.Done()
}()
tk.MustExec("commit;")
wg.Wait()
tk1.MustExec("rollback;")
// Read Skew (G-single)
tk.MustExec("truncate table test;")
tk.MustExec("insert into test (id, value) values (1, 10);")
tk.MustExec("insert into test (id, value) values (2, 20);")
tk.MustExec("begin;")
tk1.MustExec("begin;")
tk.MustQuery("select * from test where id = 1;").Check(testkit.Rows("1 10"))
tk1.MustQuery("select * from test where id = 1;").Check(testkit.Rows("1 10"))
tk1.MustQuery("select * from test where id = 2;").Check(testkit.Rows("2 20"))
tk1.MustExec("update test set value = 12 where id = 1;")
tk1.MustExec("update test set value = 18 where id = 1;")
tk1.MustExec("commit;")
tk.MustQuery("select * from test where id = 2;").Check(testkit.Rows("2 20"))
tk.MustExec("commit;")
tk.MustExec("truncate table test;")
tk.MustExec("insert into test (id, value) values (1, 10);")
tk.MustExec("insert into test (id, value) values (2, 20);")
tk.MustExec("begin;")
tk1.MustExec("begin;")
tk.MustQuery("select * from test where mod(value, 5) = 0;").Check(testkit.Rows("1 10", "2 20"))
tk1.MustExec("update test set value = 12 where value = 10;")
tk1.MustExec("commit;")
tk.MustQuery("select * from test where mod(value, 3) = 0;").Check(testkit.Rows())
tk.MustExec("commit;")
tk.MustExec("truncate table test;")
tk.MustExec("insert into test (id, value) values (1, 10);")
tk.MustExec("insert into test (id, value) values (2, 20);")