ttl: add ttl goroutine exit log

domain/domain.go

@@ -2475,6 +2475,10 @@ func (do *Domain) serverIDKeeper() {
 // StartTTLJobManager creates and starts the ttl job manager
 func (do *Domain) StartTTLJobManager() {
 	do.wg.Run(func() {
+		defer func() {
+			logutil.BgLogger().Info("ttlJobManager exited.")
+		}()
+
 		ttlJobManager := ttlworker.NewJobManager(do.ddl.GetID(), do.sysSessionPool, do.store)
 		do.ttlJobManager = ttlJobManager
 		ttlJobManager.Start()

ttl/ttlworker/del.go

@@ -255,7 +255,10 @@ func newDeleteWorker(delCh <-chan *ttlDeleteTask, sessPool sessionPool) *ttlDele
 
 func (w *ttlDeleteWorker) loop() error {
 	tracer := metrics.NewDeleteWorkerPhaseTracer()
-	defer tracer.EndPhase()
+	defer func() {
+		tracer.EndPhase()
+		logutil.BgLogger().Info("ttlDeleteWorker loop exited.")
+	}()
 
 	tracer.EnterPhase(metrics.PhaseOther)
 	se, err := getSession(w.sessionPool)

ttl/ttlworker/job_manager.go

@@ -117,6 +117,7 @@ func (m *JobManager) jobLoop() error {
 	defer func() {
 		err = multierr.Combine(err, multierr.Combine(m.resizeScanWorkers(0), m.resizeDelWorkers(0)))
 		se.Close()
+		logutil.Logger(m.ctx).Info("ttlJobManager loop exited.")
 	}()
 
 	scheduleTicker := time.Tick(jobManagerLoopTickerInterval)
@@ -247,7 +248,8 @@ func (m *JobManager) resizeWorkers(workers []worker, count int, factory func() w
 		}
 
 		var errs error
-		ctx, cancel := context.WithTimeout(m.ctx, 30*time.Second)
+		// don't use `m.ctx` here, because when shutdown the server, `m.ctx` has already been cancelled
+		ctx, cancel := context.WithTimeout(context.Background(), 30*time.Second)
 		for _, w := range workers[count:] {
 			err := w.WaitStopped(ctx, 30*time.Second)
 			if err != nil {

ttl/ttlworker/scan.go

@@ -284,7 +284,10 @@ func (w *ttlScanWorker) PollTaskResult() *ttlScanTaskExecResult {
 func (w *ttlScanWorker) loop() error {
 	ctx := w.baseWorker.ctx
 	tracer := metrics.NewScanWorkerPhaseTracer()
-	defer tracer.EndPhase()
+	defer func() {
+		tracer.EndPhase()
+		logutil.BgLogger().Info("ttlScanWorker loop exited.")
+	}()
 
 	ticker := time.Tick(time.Second * 5)
 	for w.Status() == workerStatusRunning {

ttl/ttlworker/worker.go

@@ -20,6 +20,8 @@ import (
 	"time"
 
 	"github.com/pingcap/tidb/util"
+	"github.com/pingcap/tidb/util/logutil"
+	"go.uber.org/zap"
 )
 
 type workerStatus int
@@ -122,6 +124,9 @@ func (w *baseWorker) Send() chan<- interface{} {
 func (w *baseWorker) loop() {
 	var err error
 	defer func() {
+		if r := recover(); r != nil {
+			logutil.BgLogger().Info("ttl worker panic", zap.Any("recover", r))
+		}
 		w.Lock()
 		w.toStopped(err)
 		w.Unlock()