Revert "cdc: log slow conflict detect every 60s (pingcap#11251) (ping…

…cap#11287)"

This reverts commit 053cdaf.

cdc/sinkv2/eventsink/txn/worker.go

@@ -20,7 +20,6 @@ import (
 
 	"github.com/pingcap/log"
 	"github.com/pingcap/tiflow/cdc/contextutil"
-	"github.com/pingcap/tiflow/cdc/model"
 	"github.com/pingcap/tiflow/cdc/sinkv2/metrics/txn"
 	"github.com/pingcap/tiflow/cdc/sinkv2/tablesink/state"
 	"github.com/pingcap/tiflow/pkg/causality"
@@ -47,8 +46,6 @@ type worker struct {
 	flushInterval            time.Duration
 	hasPending               bool
 	postTxnExecutedCallbacks []func()
-
-	lastSlowConflictDetectLog map[model.TableID]time.Time
 }
 
 func newWorker(ctx context.Context, ID int, backend backend, workerCount int) *worker {
@@ -71,8 +68,6 @@ func newWorker(ctx context.Context, ID int, backend backend, workerCount int) *w
 		flushInterval:            backend.MaxFlushInterval(),
 		hasPending:               false,
 		postTxnExecutedCallbacks: make([]func(), 0, 1024),
-
-		lastSlowConflictDetectLog: make(map[model.TableID]time.Time),
 	}
 }
 
@@ -90,9 +85,6 @@ func (w *worker) run(txnCh <-chan causality.TxnWithNotifier[*txnEvent]) error {
 		zap.String("changefeedID", w.changefeed),
 		zap.Int("workerID", w.ID))
 
-	cleanSlowLogHistory := time.NewTicker(time.Hour)
-	defer cleanSlowLogHistory.Stop()
-
 	start := time.Now()
 	for {
 		select {
@@ -101,15 +93,6 @@ func (w *worker) run(txnCh <-chan causality.TxnWithNotifier[*txnEvent]) error {
 				zap.String("changefeedID", w.changefeed),
 				zap.Int("workerID", w.ID))
 			return nil
-		case <-cleanSlowLogHistory.C:
-			lastSlowConflictDetectLog := w.lastSlowConflictDetectLog
-			w.lastSlowConflictDetectLog = make(map[model.TableID]time.Time)
-			now := time.Now()
-			for tableID, lastLog := range lastSlowConflictDetectLog {
-				if now.Sub(lastLog) <= time.Minute {
-					w.lastSlowConflictDetectLog[tableID] = lastLog
-				}
-			}
 		case txn := <-txnCh:
 			// we get the data from txnCh.out until no more data here or reach the state that can be flushed.
 			// If no more data in txnCh.out, and also not reach the state that can be flushed,
@@ -166,24 +149,8 @@ func (w *worker) onEvent(txn *txnEvent, postTxnExecuted func()) bool {
 		return false
 	}
 
-	conflictDetectTime := txn.conflictResolved.Sub(txn.start).Seconds()
-	w.metricConflictDetectDuration.Observe(conflictDetectTime)
+	w.metricConflictDetectDuration.Observe(txn.conflictResolved.Sub(txn.start).Seconds())
 	w.metricQueueDuration.Observe(time.Since(txn.start).Seconds())
-
-	// Log tables which conflict detect time larger than 1 minute.
-	if conflictDetectTime > float64(60) {
-		now := time.Now()
-		// Log slow conflict detect tables every minute.
-		if lastLog, ok := w.lastSlowConflictDetectLog[txn.Event.TableInfo.ID]; !ok || now.Sub(lastLog) > time.Minute {
-			log.Warn("Transaction dmlSink finds a slow transaction in conflict detector",
-				zap.String("changefeedID", w.changefeed),
-				zap.Int("workerID", w.ID),
-				zap.Int64("TableID", txn.Event.TableInfo.ID),
-				zap.Float64("seconds", conflictDetectTime))
-			w.lastSlowConflictDetectLog[txn.Event.Table.TableID] = now
-		}
-	}
-
 	w.metricTxnWorkerHandledRows.Add(float64(len(txn.Event.Rows)))
 	w.postTxnExecutedCallbacks = append(w.postTxnExecutedCallbacks, postTxnExecuted)
 	return w.backend.OnTxnEvent(txn.TxnCallbackableEvent)