Fix Filer Sync Issue: 5455 (#5663)

weed/server/filer_server.go

@@ -74,6 +74,7 @@ type FilerOption struct {
 	DiskType              string
 	AllowedOrigins        []string
 	ExposeDirectoryData   bool
+	JoinExistingFiler     bool
 }
 
 type FilerServer struct {
@@ -197,6 +198,9 @@ func NewFilerServer(defaultMux, readonlyMux *http.ServeMux, option *FilerOption)
 
 	existingNodes := fs.filer.ListExistingPeerUpdates()
 	startFromTime := time.Now().Add(-filer.LogFlushInterval)
+	if option.JoinExistingFiler {
+		startFromTime = time.Time{}
+	}
 	if isFresh {
 		glog.V(0).Infof("%s bootstrap from peers %+v", option.Host, existingNodes)
 		if err := fs.filer.MaybeBootstrapFromPeers(option.Host, existingNodes, startFromTime); err != nil {