*: Support LOCK/UNLOCK TABLES feature (pingcap#10343)

config/config.go

@@ -103,6 +103,9 @@ type Config struct {
 	TreatOldVersionUTF8AsUTF8MB4 bool        `toml:"treat-old-version-utf8-as-utf8mb4" json:"treat-old-version-utf8-as-utf8mb4"`
 	SplitRegionMaxNum            uint64      `toml:"split-region-max-num" json:"split-region-max-num"`
 	StmtSummary                  StmtSummary `toml:"stmt-summary" json:"stmt-summary"`
+	// EnableTableLock indicate whether enable table lock.
+	// TODO: remove this after table lock features stable.
+	EnableTableLock bool `toml:"enable-table-lock" json:"enable-table-lock"`
 }
 
 // Log is the log section of config.
@@ -376,6 +379,7 @@ var defaultConf = Config{
 	AlterPrimaryKey:              false,
 	TreatOldVersionUTF8AsUTF8MB4: true,
 	SplitRegionMaxNum:            1000,
+	EnableTableLock:              false,
 	TxnLocalLatches: TxnLocalLatches{
 		Enabled:  false,
 		Capacity: 2048000,
@@ -652,6 +656,11 @@ func hasRootPrivilege() bool {
 	return os.Geteuid() == 0
 }
 
+// TableLockEnabled uses to check whether enabled the table lock feature.
+func TableLockEnabled() bool {
+	return GetGlobalConfig().EnableTableLock
+}
+
 // ToLogConfig converts *Log to *logutil.LogConfig.
 func (l *Log) ToLogConfig() *logutil.LogConfig {
 	return logutil.NewLogConfig(l.Level, l.Format, l.SlowQueryFile, l.File, l.DisableTimestamp, func(config *zaplog.Config) { config.DisableErrorVerbose = l.DisableErrorStack })

config/config.toml.example

@@ -74,6 +74,9 @@ alter-primary-key = false
 # if server-version = "", the default value(original TiDB version string) is used.
 server-version = ""
 
+# enable-table-lock is used to control table lock feature. Default is false, indicate the table lock feature is disabled.
+enable-table-lock = false
+
 [log]
 # Log level: debug, info, warn, error, fatal.
 level = "info"

config/config_test.go

@@ -69,6 +69,7 @@ alter-primary-key = true
 split-region-max-num=10000
 server-version = "test_version"
 max-index-length = 3080
+enable-table-lock = true
 [performance]
 txn-entry-count-limit=2000
 txn-total-size-limit=2000
@@ -115,6 +116,7 @@ history-size=100
 	c.Assert(conf.StmtSummary.RefreshInterval, Equals, 100)
 	c.Assert(conf.StmtSummary.HistorySize, Equals, 100)
 	c.Assert(conf.MaxIndexLength, Equals, 3080)
+	c.Assert(conf.EnableTableLock, IsTrue)
 	c.Assert(f.Close(), IsNil)
 	c.Assert(os.Remove(configFile), IsNil)