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session_test.go
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session_test.go
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// Copyright 2015 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"
"flag"
"fmt"
"net"
"os"
"path"
"runtime"
"sort"
"strconv"
"strings"
"sync"
"sync/atomic"
"testing"
"time"
"github.com/docker/go-units"
. "github.com/pingcap/check"
"github.com/pingcap/errors"
"github.com/pingcap/failpoint"
"github.com/pingcap/tidb/config"
"github.com/pingcap/tidb/ddl/placement"
"github.com/pingcap/tidb/domain"
"github.com/pingcap/tidb/errno"
"github.com/pingcap/tidb/executor"
"github.com/pingcap/tidb/infoschema"
"github.com/pingcap/tidb/kv"
"github.com/pingcap/tidb/meta/autoid"
"github.com/pingcap/tidb/parser"
"github.com/pingcap/tidb/parser/auth"
"github.com/pingcap/tidb/parser/format"
"github.com/pingcap/tidb/parser/model"
"github.com/pingcap/tidb/parser/mysql"
"github.com/pingcap/tidb/parser/terror"
plannercore "github.com/pingcap/tidb/planner/core"
"github.com/pingcap/tidb/privilege/privileges"
"github.com/pingcap/tidb/session"
"github.com/pingcap/tidb/session/txninfo"
"github.com/pingcap/tidb/sessionctx"
"github.com/pingcap/tidb/sessionctx/binloginfo"
"github.com/pingcap/tidb/sessionctx/variable"
"github.com/pingcap/tidb/statistics/handle"
"github.com/pingcap/tidb/store/copr"
"github.com/pingcap/tidb/store/driver"
"github.com/pingcap/tidb/store/mockstore"
"github.com/pingcap/tidb/store/mockstore/mockcopr"
"github.com/pingcap/tidb/table/tables"
"github.com/pingcap/tidb/tablecodec"
newTestkit "github.com/pingcap/tidb/testkit"
"github.com/pingcap/tidb/types"
"github.com/pingcap/tidb/util"
"github.com/pingcap/tidb/util/memory"
"github.com/pingcap/tidb/util/sqlexec"
"github.com/pingcap/tidb/util/testkit"
"github.com/pingcap/tidb/util/testleak"
"github.com/pingcap/tipb/go-binlog"
"github.com/stretchr/testify/require"
"github.com/tikv/client-go/v2/testutils"
"github.com/tikv/client-go/v2/tikv"
"github.com/tikv/client-go/v2/txnkv/transaction"
clientv3 "go.etcd.io/etcd/client/v3"
"google.golang.org/grpc"
)
var (
pdAddrs = flag.String("pd-addrs", "127.0.0.1:2379", "pd addrs")
withTiKV = flag.Bool("with-tikv", false, "run tests with TiKV cluster started. (not use the mock server)")
pdAddrChan chan string
initPdAddrsOnce sync.Once
)
var _ = Suite(&testSessionSuite{})
var _ = Suite(&testSessionSuite2{})
var _ = Suite(&testSessionSuite3{})
var _ = Suite(&testSchemaSuite{})
var _ = SerialSuites(&testSchemaSerialSuite{})
var _ = SerialSuites(&testSessionSerialSuite{})
var _ = SerialSuites(&testBackupRestoreSuite{})
var _ = SerialSuites(&testTxnStateSerialSuite{})
var _ = SerialSuites(&testStatisticsSuite{})
var _ = SerialSuites(&testTiDBAsLibrary{})
type testSessionSuiteBase struct {
cluster testutils.Cluster
store kv.Storage
dom *domain.Domain
pdAddr string
}
type testSessionSuite struct {
testSessionSuiteBase
}
type testSessionSuite2 struct {
testSessionSuiteBase
}
type testSessionSuite3 struct {
testSessionSuiteBase
}
type testSessionSerialSuite struct {
testSessionSuiteBase
}
type testBackupRestoreSuite struct {
testSessionSuiteBase
}
// testStatisticsSuite contains test about statistics which need running with real TiKV.
// Only tests under /session will be run with real TiKV so we put them here instead of /statistics.
type testStatisticsSuite struct {
testSessionSuiteBase
}
type testTiDBAsLibrary struct{}
func clearStorage(store kv.Storage) error {
txn, err := store.Begin()
if err != nil {
return errors.Trace(err)
}
iter, err := txn.Iter(nil, nil)
if err != nil {
return errors.Trace(err)
}
for iter.Valid() {
txn.Delete(iter.Key())
if err := iter.Next(); err != nil {
return errors.Trace(err)
}
}
return txn.Commit(context.Background())
}
func clearETCD(ebd kv.EtcdBackend) error {
endpoints, err := ebd.EtcdAddrs()
if err != nil {
return err
}
cli, err := clientv3.New(clientv3.Config{
Endpoints: endpoints,
AutoSyncInterval: 30 * time.Second,
DialTimeout: 5 * time.Second,
DialOptions: []grpc.DialOption{
grpc.WithBackoffMaxDelay(time.Second * 3),
},
TLS: ebd.TLSConfig(),
})
if err != nil {
return errors.Trace(err)
}
defer cli.Close()
resp, err := cli.Get(context.Background(), "/tidb", clientv3.WithPrefix())
if err != nil {
return errors.Trace(err)
}
for _, kv := range resp.Kvs {
if kv.Lease != 0 {
if _, err := cli.Revoke(context.Background(), clientv3.LeaseID(kv.Lease)); err != nil {
return errors.Trace(err)
}
}
}
_, err = cli.Delete(context.Background(), "/tidb", clientv3.WithPrefix())
if err != nil {
return errors.Trace(err)
}
return nil
}
func initPdAddrs() {
initPdAddrsOnce.Do(func() {
addrs := strings.Split(*pdAddrs, ",")
pdAddrChan = make(chan string, len(addrs))
for _, addr := range addrs {
addr = strings.TrimSpace(addr)
if addr != "" {
pdAddrChan <- addr
}
}
})
}
func (s *testSessionSuiteBase) SetUpSuite(c *C) {
testleak.BeforeTest()
if *withTiKV {
initPdAddrs()
s.pdAddr = <-pdAddrChan
var d driver.TiKVDriver
config.UpdateGlobal(func(conf *config.Config) {
conf.TxnLocalLatches.Enabled = false
})
store, err := d.Open(fmt.Sprintf("tikv://%s?disableGC=true", s.pdAddr))
c.Assert(err, IsNil)
err = clearStorage(store)
c.Assert(err, IsNil)
err = clearETCD(store.(kv.EtcdBackend))
c.Assert(err, IsNil)
session.ResetStoreForWithTiKVTest(store)
s.store = store
} else {
store, err := mockstore.NewMockStore(
mockstore.WithClusterInspector(func(c testutils.Cluster) {
mockstore.BootstrapWithSingleStore(c)
s.cluster = c
}),
)
c.Assert(err, IsNil)
s.store = store
session.DisableStats4Test()
}
var err error
s.dom, err = session.BootstrapSession(s.store)
c.Assert(err, IsNil)
}
func (s *testSessionSuiteBase) TearDownSuite(c *C) {
s.dom.Close()
s.store.Close()
testleak.AfterTest(c)()
if *withTiKV {
pdAddrChan <- s.pdAddr
}
}
func (s *testSessionSuiteBase) TearDownTest(c *C) {
tk := testkit.NewTestKitWithInit(c, s.store)
r := tk.MustQuery("show full tables")
for _, tb := range r.Rows() {
tableName := tb[0]
tableType := tb[1]
switch tableType {
case "VIEW":
tk.MustExec(fmt.Sprintf("drop view %v", tableName))
case "BASE TABLE":
tk.MustExec(fmt.Sprintf("drop table %v", tableName))
default:
panic(fmt.Sprintf("Unexpected table '%s' with type '%s'.", tableName, tableType))
}
}
}
func createStorage(t *testing.T) (kv.Storage, func()) {
if *withTiKV {
initPdAddrs()
pdAddr := <-pdAddrChan
var d driver.TiKVDriver
config.UpdateGlobal(func(conf *config.Config) {
conf.TxnLocalLatches.Enabled = false
})
store, err := d.Open(fmt.Sprintf("tikv://%s?disableGC=true", pdAddr))
require.NoError(t, err)
require.NoError(t, clearStorage(store))
require.NoError(t, clearETCD(store.(kv.EtcdBackend)))
session.ResetStoreForWithTiKVTest(store)
dom, err := session.BootstrapSession(store)
require.NoError(t, err)
return store, func() {
dom.Close()
require.NoError(t, store.Close())
pdAddrChan <- pdAddr
}
}
return newTestkit.CreateMockStore(t)
}
type mockBinlogPump struct {
}
var _ binlog.PumpClient = &mockBinlogPump{}
func (p *mockBinlogPump) WriteBinlog(ctx context.Context, in *binlog.WriteBinlogReq, opts ...grpc.CallOption) (*binlog.WriteBinlogResp, error) {
return &binlog.WriteBinlogResp{}, nil
}
type mockPumpPullBinlogsClient struct {
grpc.ClientStream
}
func (m mockPumpPullBinlogsClient) Recv() (*binlog.PullBinlogResp, error) {
return nil, nil
}
func (p *mockBinlogPump) PullBinlogs(ctx context.Context, in *binlog.PullBinlogReq, opts ...grpc.CallOption) (binlog.Pump_PullBinlogsClient, error) {
return mockPumpPullBinlogsClient{mockcopr.MockGRPCClientStream()}, nil
}
func (s *testSessionSuite) TestForCoverage(c *C) {
// Just for test coverage.
tk := testkit.NewTestKitWithInit(c, s.store)
tk.MustExec("drop table if exists t")
tk.MustExec("create table t (id int auto_increment, v int, index (id))")
tk.MustExec("insert t values ()")
tk.MustExec("insert t values ()")
tk.MustExec("insert t values ()")
// Normal request will not cover txn.Seek.
tk.MustExec("admin check table t")
// Cover dirty table operations in StateTxn.
tk.Se.GetSessionVars().BinlogClient = binloginfo.MockPumpsClient(&mockBinlogPump{})
tk.MustExec("begin")
tk.MustExec("truncate table t")
tk.MustExec("insert t values ()")
tk.MustExec("delete from t where id = 2")
tk.MustExec("update t set v = 5 where id = 2")
tk.MustExec("insert t values ()")
tk.MustExec("rollback")
c.Check(tk.Se.SetCollation(mysql.DefaultCollationID), IsNil)
tk.MustExec("show processlist")
_, err := tk.Se.FieldList("t")
c.Check(err, IsNil)
}
func (s *testSessionSuite2) TestErrorRollback(c *C) {
tk := testkit.NewTestKitWithInit(c, s.store)
tk.MustExec("drop table if exists t_rollback")
tk.MustExec("create table t_rollback (c1 int, c2 int, primary key(c1))")
tk.MustExec("insert into t_rollback values (0, 0)")
var wg sync.WaitGroup
cnt := 4
wg.Add(cnt)
num := 20
for i := 0; i < cnt; i++ {
go func() {
defer wg.Done()
localTk := testkit.NewTestKitWithInit(c, s.store)
localTk.MustExec("set @@session.tidb_retry_limit = 100")
for j := 0; j < num; j++ {
localTk.Exec("insert into t_rollback values (1, 1)")
localTk.MustExec("update t_rollback set c2 = c2 + 1 where c1 = 0")
}
}()
}
wg.Wait()
tk.MustQuery("select c2 from t_rollback where c1 = 0").Check(testkit.Rows(fmt.Sprint(cnt * num)))
}
func (s *testSessionSuite) TestQueryString(c *C) {
tk := testkit.NewTestKitWithInit(c, s.store)
tk.MustExec("create table mutil1 (a int);create table multi2 (a int)")
queryStr := tk.Se.Value(sessionctx.QueryString)
c.Assert(queryStr, Equals, "create table multi2 (a int)")
// Test execution of DDL through the "ExecutePreparedStmt" interface.
_, err := tk.Se.Execute(context.Background(), "use test;")
c.Assert(err, IsNil)
_, err = tk.Se.Execute(context.Background(), "CREATE TABLE t (id bigint PRIMARY KEY, age int)")
c.Assert(err, IsNil)
_, err = tk.Se.Execute(context.Background(), "show create table t")
c.Assert(err, IsNil)
id, _, _, err := tk.Se.PrepareStmt("CREATE TABLE t2(id bigint PRIMARY KEY, age int)")
c.Assert(err, IsNil)
params := []types.Datum{}
_, err = tk.Se.ExecutePreparedStmt(context.Background(), id, params)
c.Assert(err, IsNil)
qs := tk.Se.Value(sessionctx.QueryString)
c.Assert(qs.(string), Equals, "CREATE TABLE t2(id bigint PRIMARY KEY, age int)")
// Test execution of DDL through the "Execute" interface.
_, err = tk.Se.Execute(context.Background(), "use test;")
c.Assert(err, IsNil)
_, err = tk.Se.Execute(context.Background(), "drop table t2")
c.Assert(err, IsNil)
_, err = tk.Se.Execute(context.Background(), "prepare stmt from 'CREATE TABLE t2(id bigint PRIMARY KEY, age int)'")
c.Assert(err, IsNil)
_, err = tk.Se.Execute(context.Background(), "execute stmt")
c.Assert(err, IsNil)
qs = tk.Se.Value(sessionctx.QueryString)
c.Assert(qs.(string), Equals, "CREATE TABLE t2(id bigint PRIMARY KEY, age int)")
}
func (s *testSessionSuite) TestAffectedRows(c *C) {
tk := testkit.NewTestKitWithInit(c, s.store)
tk.MustExec("drop table if exists t")
tk.MustExec("create table t(id TEXT)")
tk.MustExec(`INSERT INTO t VALUES ("a");`)
c.Assert(int(tk.Se.AffectedRows()), Equals, 1)
tk.MustExec(`INSERT INTO t VALUES ("b");`)
c.Assert(int(tk.Se.AffectedRows()), Equals, 1)
tk.MustExec(`UPDATE t set id = 'c' where id = 'a';`)
c.Assert(int(tk.Se.AffectedRows()), Equals, 1)
tk.MustExec(`UPDATE t set id = 'a' where id = 'a';`)
c.Assert(int(tk.Se.AffectedRows()), Equals, 0)
tk.MustQuery(`SELECT * from t`).Check(testkit.Rows("c", "b"))
c.Assert(int(tk.Se.AffectedRows()), Equals, 0)
tk.MustExec("drop table if exists t")
tk.MustExec("create table t (id int, data int)")
tk.MustExec(`INSERT INTO t VALUES (1, 0), (0, 0), (1, 1);`)
tk.MustExec(`UPDATE t set id = 1 where data = 0;`)
c.Assert(int(tk.Se.AffectedRows()), Equals, 1)
tk.MustExec("drop table if exists t")
tk.MustExec("create table t (id int, c1 timestamp);")
tk.MustExec(`insert t(id) values(1);`)
tk.MustExec(`UPDATE t set id = 1 where id = 1;`)
c.Assert(int(tk.Se.AffectedRows()), Equals, 0)
// With ON DUPLICATE KEY UPDATE, the affected-rows value per row is 1 if the row is inserted as a new row,
// 2 if an existing row is updated, and 0 if an existing row is set to its current values.
tk.MustExec("drop table if exists t")
tk.MustExec("create table t (c1 int PRIMARY KEY, c2 int);")
tk.MustExec(`insert t values(1, 1);`)
tk.MustExec(`insert into t values (1, 1) on duplicate key update c2=2;`)
c.Assert(int(tk.Se.AffectedRows()), Equals, 2)
tk.MustExec(`insert into t values (1, 1) on duplicate key update c2=2;`)
c.Assert(int(tk.Se.AffectedRows()), Equals, 0)
tk.MustExec("drop table if exists test")
createSQL := `CREATE TABLE test (
id VARCHAR(36) PRIMARY KEY NOT NULL,
factor INTEGER NOT NULL DEFAULT 2);`
tk.MustExec(createSQL)
insertSQL := `INSERT INTO test(id) VALUES('id') ON DUPLICATE KEY UPDATE factor=factor+3;`
tk.MustExec(insertSQL)
c.Assert(int(tk.Se.AffectedRows()), Equals, 1)
tk.MustExec(insertSQL)
c.Assert(int(tk.Se.AffectedRows()), Equals, 2)
tk.MustExec(insertSQL)
c.Assert(int(tk.Se.AffectedRows()), Equals, 2)
tk.Se.SetClientCapability(mysql.ClientFoundRows)
tk.MustExec("drop table if exists t")
tk.MustExec("create table t (id int, data int)")
tk.MustExec(`INSERT INTO t VALUES (1, 0), (0, 0), (1, 1);`)
tk.MustExec(`UPDATE t set id = 1 where data = 0;`)
c.Assert(int(tk.Se.AffectedRows()), Equals, 2)
}
func (s *testSessionSuite3) TestLastMessage(c *C) {
tk := testkit.NewTestKitWithInit(c, s.store)
tk.MustExec("drop table if exists t")
tk.MustExec("create table t(id TEXT)")
// Insert
tk.MustExec(`INSERT INTO t VALUES ("a");`)
tk.CheckLastMessage("")
tk.MustExec(`INSERT INTO t VALUES ("b"), ("c");`)
tk.CheckLastMessage("Records: 2 Duplicates: 0 Warnings: 0")
// Update
tk.MustExec(`UPDATE t set id = 'c' where id = 'a';`)
c.Assert(int(tk.Se.AffectedRows()), Equals, 1)
tk.CheckLastMessage("Rows matched: 1 Changed: 1 Warnings: 0")
tk.MustExec(`UPDATE t set id = 'a' where id = 'a';`)
c.Assert(int(tk.Se.AffectedRows()), Equals, 0)
tk.CheckLastMessage("Rows matched: 0 Changed: 0 Warnings: 0")
// Replace
tk.MustExec(`drop table if exists t, t1;
create table t (c1 int PRIMARY KEY, c2 int);
create table t1 (a1 int, a2 int);`)
tk.MustExec(`INSERT INTO t VALUES (1,1)`)
tk.MustExec(`REPLACE INTO t VALUES (2,2)`)
tk.CheckLastMessage("")
tk.MustExec(`INSERT INTO t1 VALUES (1,10), (3,30);`)
tk.CheckLastMessage("Records: 2 Duplicates: 0 Warnings: 0")
tk.MustExec(`REPLACE INTO t SELECT * from t1`)
tk.CheckLastMessage("Records: 2 Duplicates: 1 Warnings: 0")
// Check insert with CLIENT_FOUND_ROWS is set
tk.Se.SetClientCapability(mysql.ClientFoundRows)
tk.MustExec(`drop table if exists t, t1;
create table t (c1 int PRIMARY KEY, c2 int);
create table t1 (a1 int, a2 int);`)
tk.MustExec(`INSERT INTO t1 VALUES (1, 10), (2, 2), (3, 30);`)
tk.MustExec(`INSERT INTO t1 VALUES (1, 10), (2, 20), (3, 30);`)
tk.MustExec(`INSERT INTO t SELECT * FROM t1 ON DUPLICATE KEY UPDATE c2=a2;`)
tk.CheckLastMessage("Records: 6 Duplicates: 3 Warnings: 0")
}
// TestRowLock . See http://dev.mysql.com/doc/refman/5.7/en/commit.html.
func (s *testSessionSuite) TestRowLock(c *C) {
tk := testkit.NewTestKitWithInit(c, s.store)
tk1 := testkit.NewTestKitWithInit(c, s.store)
tk2 := testkit.NewTestKitWithInit(c, s.store)
tk.MustExec("drop table if exists t")
txn, err := tk.Se.Txn(true)
c.Assert(kv.ErrInvalidTxn.Equal(err), IsTrue)
c.Assert(txn.Valid(), IsFalse)
tk.MustExec("create table t (c1 int, c2 int, c3 int)")
tk.MustExec("insert t values (11, 2, 3)")
tk.MustExec("insert t values (12, 2, 3)")
tk.MustExec("insert t values (13, 2, 3)")
tk1.MustExec("set @@tidb_disable_txn_auto_retry = 0")
tk1.MustExec("begin")
tk1.MustExec("update t set c2=21 where c1=11")
tk2.MustExec("begin")
tk2.MustExec("update t set c2=211 where c1=11")
tk2.MustExec("commit")
// tk1 will retry and the final value is 21
tk1.MustExec("commit")
// Check the result is correct
tk.MustQuery("select c2 from t where c1=11").Check(testkit.Rows("21"))
tk1.MustExec("begin")
tk1.MustExec("update t set c2=21 where c1=11")
tk2.MustExec("begin")
tk2.MustExec("update t set c2=22 where c1=12")
tk2.MustExec("commit")
tk1.MustExec("commit")
}
// TestAutocommit . See https://dev.mysql.com/doc/internals/en/status-flags.html
func (s *testSessionSuite) TestAutocommit(c *C) {
tk := testkit.NewTestKitWithInit(c, s.store)
tk.MustExec("drop table if exists t;")
c.Assert(int(tk.Se.Status()&mysql.ServerStatusAutocommit), Greater, 0)
tk.MustExec("create table t (id BIGINT PRIMARY KEY AUTO_INCREMENT NOT NULL)")
c.Assert(int(tk.Se.Status()&mysql.ServerStatusAutocommit), Greater, 0)
tk.MustExec("insert t values ()")
c.Assert(int(tk.Se.Status()&mysql.ServerStatusAutocommit), Greater, 0)
tk.MustExec("begin")
c.Assert(int(tk.Se.Status()&mysql.ServerStatusAutocommit), Greater, 0)
tk.MustExec("insert t values ()")
c.Assert(int(tk.Se.Status()&mysql.ServerStatusAutocommit), Greater, 0)
tk.MustExec("drop table if exists t")
c.Assert(int(tk.Se.Status()&mysql.ServerStatusAutocommit), Greater, 0)
tk.MustExec("create table t (id BIGINT PRIMARY KEY AUTO_INCREMENT NOT NULL)")
c.Assert(int(tk.Se.Status()&mysql.ServerStatusAutocommit), Greater, 0)
tk.MustExec("set autocommit=0")
c.Assert(int(tk.Se.Status()&mysql.ServerStatusAutocommit), Equals, 0)
tk.MustExec("insert t values ()")
c.Assert(int(tk.Se.Status()&mysql.ServerStatusAutocommit), Equals, 0)
tk.MustExec("commit")
c.Assert(int(tk.Se.Status()&mysql.ServerStatusAutocommit), Equals, 0)
tk.MustExec("drop table if exists t")
c.Assert(int(tk.Se.Status()&mysql.ServerStatusAutocommit), Equals, 0)
tk.MustExec("set autocommit='On'")
c.Assert(int(tk.Se.Status()&mysql.ServerStatusAutocommit), Greater, 0)
// When autocommit is 0, transaction start ts should be the first *valid*
// statement, rather than *any* statement.
tk.MustExec("create table t (id int)")
tk.MustExec("set @@autocommit = 0")
tk.MustExec("rollback")
tk.MustExec("set @@autocommit = 0")
tk1 := testkit.NewTestKitWithInit(c, s.store)
tk1.MustExec("insert into t select 1")
tk.MustQuery("select * from t").Check(testkit.Rows("1"))
// TODO: MySQL compatibility for setting global variable.
// tk.MustExec("begin")
// tk.MustExec("insert into t values (42)")
// tk.MustExec("set @@global.autocommit = 1")
// tk.MustExec("rollback")
// tk.MustQuery("select count(*) from t where id = 42").Check(testkit.Rows("0"))
// Even the transaction is rollbacked, the set statement succeed.
// tk.MustQuery("select @@global.autocommit").Rows("1")
}
// TestTxnLazyInitialize tests that when autocommit = 0, not all statement starts
// a new transaction.
func (s *testSessionSuite) TestTxnLazyInitialize(c *C) {
testTxnLazyInitialize(s, c, false)
testTxnLazyInitialize(s, c, true)
}
func testTxnLazyInitialize(s *testSessionSuite, c *C, isPessimistic bool) {
tk := testkit.NewTestKitWithInit(c, s.store)
tk.MustExec("drop table if exists t")
tk.MustExec("create table t (id int)")
if isPessimistic {
tk.MustExec("set tidb_txn_mode = 'pessimistic'")
}
tk.MustExec("set @@autocommit = 0")
_, err := tk.Se.Txn(true)
c.Assert(kv.ErrInvalidTxn.Equal(err), IsTrue)
txn, err := tk.Se.Txn(false)
c.Assert(err, IsNil)
c.Assert(txn.Valid(), IsFalse)
tk.MustQuery("select @@tidb_current_ts").Check(testkit.Rows("0"))
tk.MustQuery("select @@tidb_current_ts").Check(testkit.Rows("0"))
// Those statement should not start a new transaction automacally.
tk.MustQuery("select 1")
tk.MustQuery("select @@tidb_current_ts").Check(testkit.Rows("0"))
tk.MustExec("set @@tidb_general_log = 0")
tk.MustQuery("select @@tidb_current_ts").Check(testkit.Rows("0"))
tk.MustQuery("explain select * from t")
tk.MustQuery("select @@tidb_current_ts").Check(testkit.Rows("0"))
// Begin statement should start a new transaction.
tk.MustExec("begin")
txn, err = tk.Se.Txn(false)
c.Assert(err, IsNil)
c.Assert(txn.Valid(), IsTrue)
tk.MustExec("rollback")
tk.MustExec("select * from t")
txn, err = tk.Se.Txn(false)
c.Assert(err, IsNil)
c.Assert(txn.Valid(), IsTrue)
tk.MustExec("rollback")
tk.MustExec("insert into t values (1)")
txn, err = tk.Se.Txn(false)
c.Assert(err, IsNil)
c.Assert(txn.Valid(), IsTrue)
tk.MustExec("rollback")
}
func (s *testSessionSuite) TestGlobalVarAccessor(c *C) {
varName := "max_allowed_packet"
varValue := "67108864" // This is the default value for max_allowed_packet
varValue1 := "4194305"
varValue2 := "4194306"
tk := testkit.NewTestKitWithInit(c, s.store)
se := tk.Se.(variable.GlobalVarAccessor)
// Get globalSysVar twice and get the same value
v, err := se.GetGlobalSysVar(varName)
c.Assert(err, IsNil)
c.Assert(v, Equals, varValue)
v, err = se.GetGlobalSysVar(varName)
c.Assert(err, IsNil)
c.Assert(v, Equals, varValue)
// Set global var to another value
err = se.SetGlobalSysVar(varName, varValue1)
c.Assert(err, IsNil)
v, err = se.GetGlobalSysVar(varName)
c.Assert(err, IsNil)
c.Assert(v, Equals, varValue1)
c.Assert(tk.Se.CommitTxn(context.TODO()), IsNil)
tk1 := testkit.NewTestKitWithInit(c, s.store)
se1 := tk1.Se.(variable.GlobalVarAccessor)
v, err = se1.GetGlobalSysVar(varName)
c.Assert(err, IsNil)
c.Assert(v, Equals, varValue1)
err = se1.SetGlobalSysVar(varName, varValue2)
c.Assert(err, IsNil)
v, err = se1.GetGlobalSysVar(varName)
c.Assert(err, IsNil)
c.Assert(v, Equals, varValue2)
c.Assert(tk1.Se.CommitTxn(context.TODO()), IsNil)
// Make sure the change is visible to any client that accesses that global variable.
v, err = se.GetGlobalSysVar(varName)
c.Assert(err, IsNil)
c.Assert(v, Equals, varValue2)
// For issue 10955, make sure the new session load `max_execution_time` into sessionVars.
tk1.MustExec("set @@global.max_execution_time = 100")
tk2 := testkit.NewTestKitWithInit(c, s.store)
c.Assert(tk2.Se.GetSessionVars().MaxExecutionTime, Equals, uint64(100))
tk1.MustExec("set @@global.max_execution_time = 0")
result := tk.MustQuery("show global variables where variable_name='sql_select_limit';")
result.Check(testkit.Rows("sql_select_limit 18446744073709551615"))
result = tk.MustQuery("show session variables where variable_name='sql_select_limit';")
result.Check(testkit.Rows("sql_select_limit 18446744073709551615"))
tk.MustExec("set session sql_select_limit=100000000000;")
result = tk.MustQuery("show global variables where variable_name='sql_select_limit';")
result.Check(testkit.Rows("sql_select_limit 18446744073709551615"))
result = tk.MustQuery("show session variables where variable_name='sql_select_limit';")
result.Check(testkit.Rows("sql_select_limit 100000000000"))
tk.MustExec("set @@global.sql_select_limit = 1")
result = tk.MustQuery("show global variables where variable_name='sql_select_limit';")
result.Check(testkit.Rows("sql_select_limit 1"))
tk.MustExec("set @@global.sql_select_limit = default")
result = tk.MustQuery("show global variables where variable_name='sql_select_limit';")
result.Check(testkit.Rows("sql_select_limit 18446744073709551615"))
result = tk.MustQuery("select @@global.autocommit;")
result.Check(testkit.Rows("1"))
result = tk.MustQuery("select @@autocommit;")
result.Check(testkit.Rows("1"))
tk.MustExec("set @@global.autocommit = 0;")
result = tk.MustQuery("select @@global.autocommit;")
result.Check(testkit.Rows("0"))
result = tk.MustQuery("select @@autocommit;")
result.Check(testkit.Rows("1"))
tk.MustExec("set @@global.autocommit=1")
_, err = tk.Exec("set global time_zone = 'timezone'")
c.Assert(err, NotNil)
c.Assert(terror.ErrorEqual(err, variable.ErrUnknownTimeZone), IsTrue)
}
func (s *testSessionSuite) TestUpgradeSysvars(c *C) {
tk := testkit.NewTestKitWithInit(c, s.store)
se := tk.Se.(variable.GlobalVarAccessor)
// Set the global var to a non canonical form of the value
// i.e. implying that it was set from an earlier version of TiDB.
tk.MustExec(`REPLACE INTO mysql.global_variables (variable_name, variable_value) VALUES ('tidb_enable_noop_functions', '0')`)
domain.GetDomain(tk.Se).NotifyUpdateSysVarCache() // update cache
v, err := se.GetGlobalSysVar("tidb_enable_noop_functions")
c.Assert(err, IsNil)
c.Assert(v, Equals, "OFF")
// Set the global var to "" which is the invalid version of this from TiDB 4.0.16
// the err is quashed by the GetGlobalSysVar, and the default value is restored.
// This helps callers of GetGlobalSysVar(), which can't individually be expected
// to handle upgrade/downgrade issues correctly.
tk.MustExec(`REPLACE INTO mysql.global_variables (variable_name, variable_value) VALUES ('rpl_semi_sync_slave_enabled', '')`)
domain.GetDomain(tk.Se).NotifyUpdateSysVarCache() // update cache
v, err = se.GetGlobalSysVar("rpl_semi_sync_slave_enabled")
c.Assert(err, IsNil)
c.Assert(v, Equals, "OFF") // the default value is restored.
result := tk.MustQuery("SHOW VARIABLES LIKE 'rpl_semi_sync_slave_enabled'")
result.Check(testkit.Rows("rpl_semi_sync_slave_enabled OFF"))
// Ensure variable out of range is converted to in range after upgrade.
// This further helps for https://github.com/pingcap/tidb/pull/28842
tk.MustExec(`REPLACE INTO mysql.global_variables (variable_name, variable_value) VALUES ('tidb_executor_concurrency', '999')`)
domain.GetDomain(tk.Se).NotifyUpdateSysVarCache() // update cache
v, err = se.GetGlobalSysVar("tidb_executor_concurrency")
c.Assert(err, IsNil)
c.Assert(v, Equals, "256") // the max value is restored.
// Handle the case of a completely bogus value from an earlier version of TiDB.
// This could be the case if an ENUM sysvar removes a value.
tk.MustExec(`REPLACE INTO mysql.global_variables (variable_name, variable_value) VALUES ('tidb_enable_noop_functions', 'SOMEVAL')`)
domain.GetDomain(tk.Se).NotifyUpdateSysVarCache() // update cache
v, err = se.GetGlobalSysVar("tidb_enable_noop_functions")
c.Assert(err, IsNil)
c.Assert(v, Equals, "OFF") // the default value is restored.
}
func (s *testSessionSuite) TestSetInstanceSysvarBySetGlobalSysVar(c *C) {
varName := "tidb_general_log"
defaultValue := "OFF" // This is the default value for tidb_general_log
tk := testkit.NewTestKitWithInit(c, s.store)
se := tk.Se.(variable.GlobalVarAccessor)
// Get globalSysVar twice and get the same default value
v, err := se.GetGlobalSysVar(varName)
c.Assert(err, IsNil)
c.Assert(v, Equals, defaultValue)
v, err = se.GetGlobalSysVar(varName)
c.Assert(err, IsNil)
c.Assert(v, Equals, defaultValue)
// session.GetGlobalSysVar would not get the value which session.SetGlobalSysVar writes,
// because SetGlobalSysVar calls SetGlobalFromHook, which uses TiDBGeneralLog's SetGlobal,
// but GetGlobalSysVar could not access TiDBGeneralLog's GetGlobal.
// set to "1"
err = se.SetGlobalSysVar(varName, "ON")
c.Assert(err, IsNil)
v, err = se.GetGlobalSysVar(varName)
tk.MustQuery("select @@global.tidb_general_log").Check(testkit.Rows("1"))
c.Assert(err, IsNil)
c.Assert(v, Equals, defaultValue)
// set back to "0"
err = se.SetGlobalSysVar(varName, defaultValue)
c.Assert(err, IsNil)
v, err = se.GetGlobalSysVar(varName)
tk.MustQuery("select @@global.tidb_general_log").Check(testkit.Rows("0"))
c.Assert(err, IsNil)
c.Assert(v, Equals, defaultValue)
}
func (s *testSessionSuite) TestMatchIdentity(c *C) {
tk := testkit.NewTestKitWithInit(c, s.store)
tk.MustExec("CREATE USER `useridentity`@`%`")
tk.MustExec("CREATE USER `useridentity`@`localhost`")
tk.MustExec("CREATE USER `useridentity`@`192.168.1.1`")
tk.MustExec("CREATE USER `useridentity`@`example.com`")
// The MySQL matching rule is most specific to least specific.
// So if I log in from 192.168.1.1 I should match that entry always.
identity, err := tk.Se.MatchIdentity("useridentity", "192.168.1.1")
c.Assert(err, IsNil)
c.Assert(identity.Username, Equals, "useridentity")
c.Assert(identity.Hostname, Equals, "192.168.1.1")
// If I log in from localhost, I should match localhost
identity, err = tk.Se.MatchIdentity("useridentity", "localhost")
c.Assert(err, IsNil)
c.Assert(identity.Username, Equals, "useridentity")
c.Assert(identity.Hostname, Equals, "localhost")
// If I log in from 192.168.1.2 I should match wildcard.
identity, err = tk.Se.MatchIdentity("useridentity", "192.168.1.2")
c.Assert(err, IsNil)
c.Assert(identity.Username, Equals, "useridentity")
c.Assert(identity.Hostname, Equals, "%")
identity, err = tk.Se.MatchIdentity("useridentity", "127.0.0.1")
c.Assert(err, IsNil)
c.Assert(identity.Username, Equals, "useridentity")
c.Assert(identity.Hostname, Equals, "localhost")
// This uses the lookup of example.com to get an IP address.
// We then login with that IP address, but expect it to match the example.com
// entry in the privileges table (by reverse lookup).
ips, err := net.LookupHost("example.com")
c.Assert(err, IsNil)
identity, err = tk.Se.MatchIdentity("useridentity", ips[0])
c.Assert(err, IsNil)
c.Assert(identity.Username, Equals, "useridentity")
// FIXME: we *should* match example.com instead
// as long as skip-name-resolve is not set (DEFAULT)
c.Assert(identity.Hostname, Equals, "%")
}
func (s *testSessionSuite) TestGetSysVariables(c *C) {
tk := testkit.NewTestKitWithInit(c, s.store)
// Test ScopeSession
tk.MustExec("select @@warning_count")
tk.MustExec("select @@session.warning_count")
tk.MustExec("select @@local.warning_count")
_, err := tk.Exec("select @@global.warning_count")
c.Assert(terror.ErrorEqual(err, variable.ErrIncorrectScope), IsTrue, Commentf("err %v", err))
// Test ScopeGlobal
tk.MustExec("select @@max_connections")
tk.MustExec("select @@global.max_connections")
_, err = tk.Exec("select @@session.max_connections")
c.Assert(err, NotNil)
c.Assert(err.Error(), Equals, "[variable:1238]Variable 'max_connections' is a GLOBAL variable")
_, err = tk.Exec("select @@local.max_connections")
c.Assert(err, NotNil)
c.Assert(err.Error(), Equals, "[variable:1238]Variable 'max_connections' is a GLOBAL variable")
// Test ScopeNone
tk.MustExec("select @@performance_schema_max_mutex_classes")
tk.MustExec("select @@global.performance_schema_max_mutex_classes")
// For issue 19524, test
tk.MustExec("select @@session.performance_schema_max_mutex_classes")
tk.MustExec("select @@local.performance_schema_max_mutex_classes")
_, err = tk.Exec("select @@global.last_insert_id")
c.Assert(err, NotNil)
c.Assert(err.Error(), Equals, "[variable:1238]Variable 'last_insert_id' is a SESSION variable")
}
func (s *testSessionSuite) TestRetryResetStmtCtx(c *C) {
tk := testkit.NewTestKitWithInit(c, s.store)
tk.MustExec("create table retrytxn (a int unique, b int)")
tk.MustExec("insert retrytxn values (1, 1)")
tk.MustExec("set @@tidb_disable_txn_auto_retry = 0")
tk.MustExec("begin")
tk.MustExec("update retrytxn set b = b + 1 where a = 1")
// Make retryable error.
tk1 := testkit.NewTestKitWithInit(c, s.store)
tk1.MustExec("update retrytxn set b = b + 1 where a = 1")
err := tk.Se.CommitTxn(context.TODO())
c.Assert(err, IsNil)
c.Assert(tk.Se.AffectedRows(), Equals, uint64(1))
}
func (s *testSessionSuite) TestRetryCleanTxn(c *C) {
tk := testkit.NewTestKitWithInit(c, s.store)
tk.MustExec("create table retrytxn (a int unique, b int)")
tk.MustExec("insert retrytxn values (1, 1)")
tk.MustExec("begin")
tk.MustExec("update retrytxn set b = b + 1 where a = 1")
// Make retryable error.
tk1 := testkit.NewTestKitWithInit(c, s.store)
tk1.MustExec("update retrytxn set b = b + 1 where a = 1")
// Hijack retry history, add a statement that returns error.
history := session.GetHistory(tk.Se)
stmtNode, err := parser.New().ParseOneStmt("insert retrytxn values (2, 'a')", "", "")
c.Assert(err, IsNil)
compiler := executor.Compiler{Ctx: tk.Se}
stmt, _ := compiler.Compile(context.TODO(), stmtNode)
executor.ResetContextOfStmt(tk.Se, stmtNode)
history.Add(stmt, tk.Se.GetSessionVars().StmtCtx)
_, err = tk.Exec("commit")
c.Assert(err, NotNil)
txn, err := tk.Se.Txn(false)
c.Assert(err, IsNil)
c.Assert(txn.Valid(), IsFalse)
c.Assert(tk.Se.GetSessionVars().InTxn(), IsFalse)
}
func (s *testSessionSuite) TestReadOnlyNotInHistory(c *C) {
tk := testkit.NewTestKitWithInit(c, s.store)
tk.MustExec("create table history (a int)")
tk.MustExec("insert history values (1), (2), (3)")
tk.MustExec("set @@autocommit = 0")
tk.MustExec("set tidb_disable_txn_auto_retry = 0")
tk.MustQuery("select * from history")
history := session.GetHistory(tk.Se)
c.Assert(history.Count(), Equals, 0)
tk.MustExec("insert history values (4)")
tk.MustExec("insert history values (5)")
c.Assert(history.Count(), Equals, 2)
tk.MustExec("commit")
tk.MustQuery("select * from history")
history = session.GetHistory(tk.Se)
c.Assert(history.Count(), Equals, 0)
}
func (s *testSessionSuite) TestRetryUnion(c *C) {
tk := testkit.NewTestKitWithInit(c, s.store)
tk.MustExec("create table history (a int)")
tk.MustExec("insert history values (1), (2), (3)")
tk.MustExec("set @@autocommit = 0")
tk.MustExec("set tidb_disable_txn_auto_retry = 0")
// UNION should't be in retry history.
tk.MustQuery("(select * from history) union (select * from history)")
history := session.GetHistory(tk.Se)
c.Assert(history.Count(), Equals, 0)
tk.MustQuery("(select * from history for update) union (select * from history)")
tk.MustExec("update history set a = a + 1")
history = session.GetHistory(tk.Se)
c.Assert(history.Count(), Equals, 2)
// Make retryable error.
tk1 := testkit.NewTestKitWithInit(c, s.store)
tk1.MustExec("update history set a = a + 1")
_, err := tk.Exec("commit")
c.Assert(err, ErrorMatches, ".*can not retry select for update statement")
}
func (s *testSessionSuite) TestRetryGlobalTempTable(c *C) {
tk := testkit.NewTestKitWithInit(c, s.store)
tk.MustExec("drop table if exists normal_table")
tk.MustExec("create table normal_table(a int primary key, b int)")
defer tk.MustExec("drop table if exists normal_table")
tk.MustExec("drop table if exists temp_table")
tk.MustExec("create global temporary table temp_table(a int primary key, b int) on commit delete rows")
defer tk.MustExec("drop table if exists temp_table")
// insert select
tk.MustExec("set tidb_disable_txn_auto_retry = 0")
tk.MustExec("insert normal_table value(100, 100)")
tk.MustExec("set @@autocommit = 0")
// used to make conflicts
tk.MustExec("update normal_table set b=b+1 where a=100")
tk.MustExec("insert temp_table value(1, 1)")
tk.MustExec("insert normal_table select * from temp_table")
c.Assert(session.GetHistory(tk.Se).Count(), Equals, 3)
// try to conflict with tk
tk1 := testkit.NewTestKitWithInit(c, s.store)
tk1.MustExec("update normal_table set b=b+1 where a=100")
// It will retry internally.
tk.MustExec("commit")
tk.MustQuery("select a, b from normal_table order by a").Check(testkit.Rows("1 1", "100 102"))
tk.MustQuery("select a, b from temp_table order by a").Check(testkit.Rows())
// update multi-tables
tk.MustExec("update normal_table set b=b+1 where a=100")
tk.MustExec("insert temp_table value(1, 2)")
// before update: normal_table=(1 1) (100 102), temp_table=(1 2)
tk.MustExec("update normal_table, temp_table set normal_table.b=temp_table.b where normal_table.a=temp_table.a")
c.Assert(session.GetHistory(tk.Se).Count(), Equals, 3)
// try to conflict with tk