fix(filer.sync): initializing the offset is related to the path (#3450)

Co-authored-by: zhihao.qu <zhihao.qu@ly.com>

weed/command/filer_sync.go

@@ -130,7 +130,7 @@ func runFilerSynchronize(cmd *Command, args []string) bool {
 	go func() {
 		// a->b
 		// set synchronization start timestamp to offset
-		initOffsetError := initOffsetFromTsMs(grpcDialOption, filerB, aFilerSignature, *syncOptions.bFromTsMs)
+		initOffsetError := initOffsetFromTsMs(grpcDialOption, filerB, aFilerSignature, *syncOptions.bFromTsMs, getSignaturePrefixByPath(*syncOptions.aPath))
 		if initOffsetError != nil {
 			glog.Errorf("init offset from timestamp %d error from %s to %s: %v", *syncOptions.bFromTsMs, *syncOptions.filerA, *syncOptions.filerB, initOffsetError)
 			os.Exit(2)
@@ -165,7 +165,7 @@ func runFilerSynchronize(cmd *Command, args []string) bool {
 	if !*syncOptions.isActivePassive {
 		// b->a
 		// set synchronization start timestamp to offset
-		initOffsetError := initOffsetFromTsMs(grpcDialOption, filerA, bFilerSignature, *syncOptions.aFromTsMs)
+		initOffsetError := initOffsetFromTsMs(grpcDialOption, filerA, bFilerSignature, *syncOptions.aFromTsMs, getSignaturePrefixByPath(*syncOptions.bPath))
 		if initOffsetError != nil {
 			glog.Errorf("init offset from timestamp %d error from %s to %s: %v", *syncOptions.aFromTsMs, *syncOptions.filerB, *syncOptions.filerA, initOffsetError)
 			os.Exit(2)
@@ -205,14 +205,14 @@ func runFilerSynchronize(cmd *Command, args []string) bool {
 }
 
 // initOffsetFromTsMs Initialize offset
-func initOffsetFromTsMs(grpcDialOption grpc.DialOption, targetFiler pb.ServerAddress, sourceFilerSignature int32, fromTsMs int64) error {
+func initOffsetFromTsMs(grpcDialOption grpc.DialOption, targetFiler pb.ServerAddress, sourceFilerSignature int32, fromTsMs int64, signaturePrefix string) error {
 	if fromTsMs <= 0 {
 		return nil
 	}
 	// convert to nanosecond
 	fromTsNs := fromTsMs * 1000_000
 	// If not successful, exit the program.
-	setOffsetErr := setOffset(grpcDialOption, targetFiler, SyncKeyPrefix, sourceFilerSignature, fromTsNs)
+	setOffsetErr := setOffset(grpcDialOption, targetFiler, signaturePrefix, sourceFilerSignature, fromTsNs)
 	if setOffsetErr != nil {
 		return setOffsetErr
 	}