Use continue lable instead of break

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

pkg/tso/keyspace_group_manager.go

@@ -1302,6 +1302,7 @@ func (kgm *KeyspaceGroupManager) mergingChecker(ctx context.Context, mergeTarget
 		mergeMap[id] = struct{}{}
 	}
 
+mergeLoop:
 	for {
 		select {
 		case <-ctx.Done():
@@ -1362,9 +1363,9 @@ func (kgm *KeyspaceGroupManager) mergingChecker(ctx context.Context, mergeTarget
 			zap.Any("merge-list", mergeList))
 		// All the keyspace group primaries in the merge list are gone,
 		// calculate the newly merged TSO to make sure it is greater than the original ones.
-		var ts, mergedTS time.Time
+		var mergedTS time.Time
 		for _, id := range mergeList {
-			ts, err = kgm.tsoSvcStorage.LoadTimestamp(endpoint.KeyspaceGroupGlobalTSPath(id))
+			ts, err := kgm.tsoSvcStorage.LoadTimestamp(endpoint.KeyspaceGroupGlobalTSPath(id))
 			if err != nil {
 				log.Error("failed to load the keyspace group TSO",
 					zap.String("member", kgm.tsoServiceID.ServiceAddr),
@@ -1373,15 +1374,13 @@ func (kgm *KeyspaceGroupManager) mergingChecker(ctx context.Context, mergeTarget
 					zap.Uint32("merge-id", id),
 					zap.Time("ts", ts),
 					zap.Error(err))
-				break
+				// Retry from the beginning of the loop.
+				continue mergeLoop
 			}
 			if ts.After(mergedTS) {
 				mergedTS = ts
 			}
 		}
-		if err != nil {
-			continue
-		}
 		// Update the newly merged TSO if the merged TSO is not zero.
 		if mergedTS != typeutil.ZeroTime {
 			log.Info("start to set the newly merged TSO",