Update cdc/puller/puller.go

Co-authored-by: dongmen <[email protected]>

cdc/puller/puller.go

@@ -283,7 +283,9 @@ func (p *pullerImpl) Run(ctx context.Context) error {
 func (p *pullerImpl) detectResolvedTsStuck() error {
 	if p.cfg.Debug.Puller.EnableResolvedTsStuckDetection {
 		resolvedTs := p.tsTracker.Frontier()
-		// check if the resolvedTs is advanced before
+		// check if the resolvedTs is advancing,
+		// If the resolvedTs in Frontier is less than startResolvedTs, it means that the incremental scan has 
+		// not complete yet. We need to make no decision in this scenario. 
 		if resolvedTs <= p.startResolvedTs {
 			return nil
 		}