statistics: add the refresher as a stats owner listener (#56998)

ref #55906

pkg/domain/domain.go

@@ -2356,7 +2356,7 @@ func (do *Domain) UpdateTableStatsLoop(ctx, initStatsCtx sessionctx.Context) err
 	variable.EnableStatsOwner = do.enableStatsOwner
 	variable.DisableStatsOwner = do.disableStatsOwner
 	do.statsOwner = do.newOwnerManager(handle.StatsPrompt, handle.StatsOwnerKey)
-	do.statsOwner.SetListener(do.ddlNotifier)
+	do.statsOwner.SetListener(owner.NewListenersWrapper(statsHandle, do.ddlNotifier))
 	do.wg.Run(func() {
 		do.indexUsageWorker()
 	}, "indexUsageWorker")

pkg/owner/BUILD.bazel

@@ -37,7 +37,7 @@ go_test(
     ],
     embed = [":owner"],
     flaky = True,
-    shard_count = 9,
+    shard_count = 10,
     deps = [
         "//pkg/ddl",
         "//pkg/infoschema",

pkg/owner/manager.go

@@ -554,3 +554,28 @@ func AcquireDistributedLock(
 		}
 	}, nil
 }
+
+// ListenersWrapper is a list of listeners.
+// A way to broadcast events to multiple listeners.
+type ListenersWrapper struct {
+	listeners []Listener
+}
+
+// OnBecomeOwner broadcasts the OnBecomeOwner event to all listeners.
+func (ol *ListenersWrapper) OnBecomeOwner() {
+	for _, l := range ol.listeners {
+		l.OnBecomeOwner()
+	}
+}
+
+// OnRetireOwner broadcasts the OnRetireOwner event to all listeners.
+func (ol *ListenersWrapper) OnRetireOwner() {
+	for _, l := range ol.listeners {
+		l.OnRetireOwner()
+	}
+}
+
+// NewListenersWrapper creates a new OwnerListeners.
+func NewListenersWrapper(listeners ...Listener) *ListenersWrapper {
+	return &ListenersWrapper{listeners: listeners}
+}

pkg/owner/manager_test.go

@@ -560,3 +560,19 @@ func TestAcquireDistributedLock(t *testing.T) {
 		release2()
 	})
 }
+
+func TestListenersWrapper(t *testing.T) {
+	lis1 := &listener{}
+	lis2 := &listener{}
+	wrapper := owner.NewListenersWrapper(lis1, lis2)
+
+	// Test OnBecomeOwner
+	wrapper.OnBecomeOwner()
+	require.True(t, lis1.val.Load())
+	require.True(t, lis2.val.Load())
+
+	// Test OnRetireOwner
+	wrapper.OnRetireOwner()
+	require.False(t, lis1.val.Load())
+	require.False(t, lis2.val.Load())
+}

pkg/statistics/handle/autoanalyze/autoanalyze.go

@@ -138,6 +138,16 @@ func (sa *statsAnalyze) CleanupCorruptedAnalyzeJobsOnDeadInstances() error {
 	}, statsutil.FlagWrapTxn)
 }
 
+// OnBecomeOwner is used to handle the event when the current TiDB instance becomes the stats owner.
+func (sa *statsAnalyze) OnBecomeOwner() {
+	sa.refresher.OnBecomeOwner()
+}
+
+// OnRetireOwner is used to handle the event when the current TiDB instance retires from being the stats owner.
+func (sa *statsAnalyze) OnRetireOwner() {
+	sa.refresher.OnRetireOwner()
+}
+
 // SelectAnalyzeJobsOnCurrentInstanceSQL is the SQL to select the analyze jobs whose
 // state is `pending` or `running` and the update time is more than 10 minutes ago
 // and the instance is current instance.

pkg/statistics/handle/autoanalyze/priorityqueue/queue.go

@@ -72,18 +72,20 @@ type pqHeap interface {
 //
 //nolint:fieldalignment
 type AnalysisPriorityQueue struct {
+	ctx         context.Context
 	statsHandle statstypes.StatsHandle
 	calculator  *PriorityCalculator
 
-	ctx    context.Context
-	cancel context.CancelFunc
-	wg     util.WaitGroupWrapper
+	wg util.WaitGroupWrapper
 
 	// syncFields is a substructure to hold fields protected by mu.
 	syncFields struct {
 		// mu is used to protect the following fields.
-		mu    sync.RWMutex
-		inner pqHeap
+		mu sync.RWMutex
+		// Because the Initialize and Close functions can be called concurrently,
+		// so we need to protect the cancel function to avoid data race.
+		cancel context.CancelFunc
+		inner  pqHeap
 		// runningJobs is a map to store the running jobs. Used to avoid duplicate jobs.
 		runningJobs map[int64]struct{}
 		// lastDMLUpdateFetchTimestamp is the timestamp of the last DML update fetch.
@@ -97,20 +99,11 @@ type AnalysisPriorityQueue struct {
 
 // NewAnalysisPriorityQueue creates a new AnalysisPriorityQueue2.
 func NewAnalysisPriorityQueue(handle statstypes.StatsHandle) *AnalysisPriorityQueue {
-	ctx, cancel := context.WithCancel(context.Background())
-
 	queue := &AnalysisPriorityQueue{
 		statsHandle: handle,
 		calculator:  NewPriorityCalculator(),
-		ctx:         ctx,
-		cancel:      cancel,
 	}
 
-	queue.syncFields.mu.Lock()
-	queue.syncFields.runningJobs = make(map[int64]struct{})
-	queue.syncFields.failedJobs = make(map[int64]struct{})
-	queue.syncFields.mu.Unlock()
-
 	return queue
 }
 
@@ -144,6 +137,12 @@ func (pq *AnalysisPriorityQueue) Initialize() error {
 		pq.Close()
 		return errors.Trace(err)
 	}
+
+	ctx, cancel := context.WithCancel(context.Background())
+	pq.ctx = ctx
+	pq.syncFields.cancel = cancel
+	pq.syncFields.runningJobs = make(map[int64]struct{})
+	pq.syncFields.failedJobs = make(map[int64]struct{})
 	pq.syncFields.initialized = true
 	pq.syncFields.mu.Unlock()
 
@@ -813,6 +812,9 @@ func (pq *AnalysisPriorityQueue) Close() {
 		return
 	}
 
-	pq.cancel()
+	// It is possible that the priority queue is not initialized.
+	if pq.syncFields.cancel != nil {
+		pq.syncFields.cancel()
+	}
 	pq.wg.Wait()
 }

pkg/statistics/handle/autoanalyze/refresher/refresher.go

@@ -251,3 +251,15 @@ func (r *Refresher) Close() {
 		r.jobs.Close()
 	}
 }
+
+// OnBecomeOwner is used to handle the event when the current TiDB instance becomes the stats owner.
+func (*Refresher) OnBecomeOwner() {
+	// No action is taken when becoming the stats owner.
+	// Initialization of the Refresher can fail, so operations are deferred until the first auto-analyze check.
+}
+
+// OnRetireOwner is used to handle the event when the current TiDB instance retires from being the stats owner.
+func (r *Refresher) OnRetireOwner() {
+	// Stop the worker and close the queue.
+	r.jobs.Close()
+}

pkg/statistics/handle/types/BUILD.bazel

@@ -9,6 +9,7 @@ go_library(
         "//pkg/ddl/notifier",
         "//pkg/infoschema",
         "//pkg/meta/model",
+        "//pkg/owner",
         "//pkg/parser/ast",
         "//pkg/sessionctx",
         "//pkg/sessionctx/stmtctx",

pkg/statistics/handle/types/interfaces.go

@@ -22,6 +22,7 @@ import (
 	"github.com/pingcap/tidb/pkg/ddl/notifier"
 	"github.com/pingcap/tidb/pkg/infoschema"
 	"github.com/pingcap/tidb/pkg/meta/model"
+	"github.com/pingcap/tidb/pkg/owner"
 	"github.com/pingcap/tidb/pkg/parser/ast"
 	"github.com/pingcap/tidb/pkg/sessionctx"
 	"github.com/pingcap/tidb/pkg/sessionctx/stmtctx"
@@ -119,6 +120,8 @@ type StatsHistory interface {
 
 // StatsAnalyze is used to handle auto-analyze and manage analyze jobs.
 type StatsAnalyze interface {
+	owner.Listener
+
 	// InsertAnalyzeJob inserts analyze job into mysql.analyze_jobs and gets job ID for further updating job.
 	InsertAnalyzeJob(job *statistics.AnalyzeJob, instance string, procID uint64) error