runaway: only check statements with a non-empty plan digest

Signed-off-by: nolouch <[email protected]>

Author: nolouch

pkg/executor/internal/querywatch/query_watch_test.go

@@ -168,3 +168,22 @@ func TestQueryWatch(t *testing.T) {
 	time.Sleep(1 * time.Second)
 	tk.MustGetErrCode("select * from test.t1", mysql.ErrResourceGroupQueryRunawayQuarantine)
 }
+
+func TestQueryWatchIssue56897(t *testing.T) {
+	require.NoError(t, failpoint.Enable("github.com/pingcap/tidb/pkg/resourcegroup/runaway/FastRunawayGC", `return(true)`))
+	defer func() {
+		require.NoError(t, failpoint.Disable("github.com/pingcap/tidb/pkg/resourcegroup/runaway/FastRunawayGC"))
+	}()
+	store, dom := testkit.CreateMockStoreAndDomain(t)
+	tk := testkit.NewTestKit(t, store)
+	tk.MustExec("use test")
+	require.Eventually(t, func() bool {
+		return dom.RunawayManager().IsSyncerInitialized()
+	}, 20*time.Second, 300*time.Millisecond)
+	tk.MustQuery("QUERY WATCH ADD ACTION KILL PLAN SIMILAR TO 'use test';").Check((testkit.Rows("1")))
+	time.Sleep(1 * time.Second)
+	_, err := tk.Exec("use test")
+	require.Nil(t, err)
+	_, err = tk.Exec("use mysql")
+	require.Nil(t, err)
+}

pkg/resourcegroup/runaway/checker.go

@@ -49,10 +49,10 @@ type Checker struct {
 	// From the group runaway settings, which will be applied when a query lacks a specified watch rule.
 	settings *rmpb.RunawaySettings
 
-	// markedByRule is set to true when the query matches the group runaway settings.
-	markedByRule atomic.Bool
-	// markedByWatch is set to true when the query matches the specified watch rules.
-	markedByWatch bool
+	// markedByIdentifyInRunawaySettings is set to true when the query matches the group runaway settings.
+	markedByIdentifyInRunawaySettings atomic.Bool
+	// markedByQueryWatchRule is set to true when the query matches the specified watch rules.
+	markedByQueryWatchRule bool
 	// watchAction is the specified watch action for the runaway query.
 	// If it's not given, the action defined in `settings` will be used.
 	watchAction rmpb.RunawayAction
@@ -65,14 +65,14 @@ func NewChecker(
 	originalSQL, sqlDigest, planDigest string, startTime time.Time,
 ) *Checker {
 	c := &Checker{
-		manager:           manager,
-		resourceGroupName: resourceGroupName,
-		originalSQL:       originalSQL,
-		sqlDigest:         sqlDigest,
-		planDigest:        planDigest,
-		settings:          settings,
-		markedByRule:      atomic.Bool{},
-		markedByWatch:     false,
+		manager:                           manager,
+		resourceGroupName:                 resourceGroupName,
+		originalSQL:                       originalSQL,
+		sqlDigest:                         sqlDigest,
+		planDigest:                        planDigest,
+		settings:                          settings,
+		markedByIdentifyInRunawaySettings: atomic.Bool{},
+		markedByQueryWatchRule:            false,
 	}
 	if settings != nil {
 		// avoid setting deadline if the threshold is 0
@@ -92,6 +92,11 @@ func (rm *Manager) DeriveChecker(resourceGroupName, originalSQL, sqlDigest, plan
 		logutil.BgLogger().Warn("cannot setup up runaway checker", zap.Error(err))
 		return nil
 	}
+	// Only check the normal query.
+	if len(planDigest) == 0 {
+		logutil.BgLogger().Warn("cannot setup up runaway checker, there is no plan digest", zap.Error(err))
+		return nil
+	}
 	rm.ActiveLock.RLock()
 	defer rm.ActiveLock.RUnlock()
 	if group.RunawaySettings == nil && rm.ActiveGroup[resourceGroupName] == 0 {
@@ -129,7 +134,7 @@ func (r *Checker) BeforeExecutor() (string, error) {
 			switchGroupName = r.settings.SwitchGroupName
 		}
 		// Mark it if this is the first time being watched.
-		r.markRunawayByWatch(action, switchGroupName, exceedCause)
+		r.markRunawayByQueryWatchRule(action, switchGroupName, exceedCause)
 		// Take action if needed.
 		switch action {
 		case rmpb.RunawayAction_Kill:
@@ -157,16 +162,16 @@ func (r *Checker) BeforeCopRequest(req *tikvrpc.Request) error {
 		return nil
 	}
 	// If the group settings are not available, and it's not marked by watch, skip this part.
-	if r.settings == nil && !r.markedByWatch {
+	if r.settings == nil && !r.markedByQueryWatchRule {
 		return nil
 	}
 	// If it's marked by watch and the action is cooldown, override the priority,
-	if r.markedByWatch && r.watchAction == rmpb.RunawayAction_CoolDown {
+	if r.markedByQueryWatchRule && r.watchAction == rmpb.RunawayAction_CoolDown {
 		req.ResourceControlContext.OverridePriority = 1 // set priority to lowest
 	}
 	// If group settings are available and the query is not marked by a rule,
 	// verify if it matches any rules in the settings.
-	if r.settings != nil && !r.markedByRule.Load() {
+	if r.settings != nil && !r.markedByIdentifyInRunawaySettings.Load() {
 		now := time.Now()
 		// only check time and need to ensure deadline existed.
 		exceedCause := r.exceedsThresholds(now, nil, 0)
@@ -181,7 +186,7 @@ func (r *Checker) BeforeCopRequest(req *tikvrpc.Request) error {
 			return nil
 		}
 		// execution time exceeds the threshold, mark the query as runaway
-		r.markRunawayByIdentify(&now, exceedCause)
+		r.markRunawayByIdentifyInRunawaySettings(&now, exceedCause)
 		// Take action if needed.
 		switch r.settings.Action {
 		case rmpb.RunawayAction_Kill:
@@ -205,10 +210,10 @@ func (r *Checker) CheckAction() rmpb.RunawayAction {
 	if r == nil {
 		return rmpb.RunawayAction_NoneAction
 	}
-	if r.markedByWatch {
+	if r.markedByQueryWatchRule {
 		return r.watchAction
 	}
-	if r.markedByRule.Load() {
+	if r.markedByIdentifyInRunawaySettings.Load() {
 		return r.settings.Action
 	}
 	return rmpb.RunawayAction_NoneAction
@@ -217,17 +222,17 @@ func (r *Checker) CheckAction() rmpb.RunawayAction {
 // CheckRuleKillAction checks whether the query should be killed according to the group settings.
 func (r *Checker) CheckRuleKillAction() (string, bool) {
 	// If the group settings are not available, and it's not marked by watch, skip this part.
-	if r == nil || r.settings == nil && !r.markedByWatch {
+	if r == nil || r.settings == nil && !r.markedByQueryWatchRule {
 		return "", false
 	}
 	// If the group settings are available, and it's not marked by rule, check the execution time.
-	if r.settings != nil && !r.markedByRule.Load() {
+	if r.settings != nil && !r.markedByIdentifyInRunawaySettings.Load() {
 		now := time.Now()
 		exceedCause := r.exceedsThresholds(now, nil, 0)
 		if exceedCause == "" {
 			return "", false
 		}
-		r.markRunawayByIdentify(&now, exceedCause)
+		r.markRunawayByIdentifyInRunawaySettings(&now, exceedCause)
 		return exceedCause, r.settings.Action == rmpb.RunawayAction_Kill
 	}
 	return "", false
@@ -243,19 +248,19 @@ func (r *Checker) markQuarantine(now *time.Time, exceedCause string) {
 		r.settings.Action, r.settings.SwitchGroupName, ttl, now, exceedCause)
 }
 
-func (r *Checker) markRunawayByIdentify(now *time.Time, exceedCause string) bool {
-	swapped := r.markedByRule.CompareAndSwap(false, true)
+func (r *Checker) markRunawayByIdentifyInRunawaySettings(now *time.Time, exceedCause string) bool {
+	swapped := r.markedByIdentifyInRunawaySettings.CompareAndSwap(false, true)
 	if swapped {
 		r.markRunaway("identify", r.settings.Action, r.settings.SwitchGroupName, now, exceedCause)
-		if !r.markedByWatch {
+		if !r.markedByQueryWatchRule {
 			r.markQuarantine(now, exceedCause)
 		}
 	}
 	return swapped
 }
 
-func (r *Checker) markRunawayByWatch(action rmpb.RunawayAction, switchGroupName, exceedCause string) {
-	r.markedByWatch = true
+func (r *Checker) markRunawayByQueryWatchRule(action rmpb.RunawayAction, switchGroupName, exceedCause string) {
+	r.markedByQueryWatchRule = true
 	r.watchAction = action
 	now := time.Now()
 	r.markRunaway("watch", action, switchGroupName, &now, exceedCause)
@@ -326,15 +331,15 @@ func (r *Checker) CheckThresholds(ruDetail *util.RUDetails, processKeys int64, e
 	// add the processed keys to the total processed keys.
 	r.totalProcessedKeys += processKeys
 	exceedCause := r.exceedsThresholds(checkTime, ruDetail, r.totalProcessedKeys)
-	if !r.markedByRule.Load() {
-		if exceedCause != "" && r.markRunawayByIdentify(&now, exceedCause) {
-			if r.markRunawayByIdentify(&now, exceedCause) {
+	if !r.markedByIdentifyInRunawaySettings.Load() {
+		if exceedCause != "" && r.markRunawayByIdentifyInRunawaySettings(&now, exceedCause) {
+			if r.markRunawayByIdentifyInRunawaySettings(&now, exceedCause) {
 				return exeerrors.ErrResourceGroupQueryRunawayInterrupted.FastGenByArgs(exceedCause)
 			}
 		}
 	}
 	// Due to concurrency, check again.
-	if r.markedByRule.Load() {
+	if r.markedByIdentifyInRunawaySettings.Load() {
 		return exeerrors.ErrResourceGroupQueryRunawayInterrupted.FastGenByArgs(exceedCause)
 	}