revert to non-streaming mode to assign file id

fix https://github.com/seaweedfs/seaweedfs/issues/4838#issuecomment-1722290685

weed/server/filer_server.go

@@ -94,9 +94,6 @@ type FilerServer struct {
 	// track known metadata listeners
 	knownListenersLock sync.Mutex
 	knownListeners     map[int32]int32
-
-	// client to assign file id
-	assignProxy *operation.AssignProxy
 }
 
 func NewFilerServer(defaultMux, readonlyMux *http.ServeMux, option *FilerOption) (fs *FilerServer, err error) {
@@ -135,8 +132,6 @@ func NewFilerServer(defaultMux, readonlyMux *http.ServeMux, option *FilerOption)
 	go stats.LoopPushingMetric("filer", string(fs.option.Host), fs.metricsAddress, fs.metricsIntervalSec)
 	go fs.filer.KeepMasterClientConnected()
 
-	fs.assignProxy, err = operation.NewAssignProxy(fs.filer.GetMaster, fs.grpcDialOption, 16)
-
 	if !util.LoadConfiguration("filer", false) {
 		v.SetDefault("leveldb2.enabled", true)
 		v.SetDefault("leveldb2.dir", option.DefaultLevelDbDir)
@@ -189,7 +184,7 @@ func NewFilerServer(defaultMux, readonlyMux *http.ServeMux, option *FilerOption)
 
 	fs.filer.Dlm.LockRing.SetTakeSnapshotCallback(fs.OnDlmChangeSnapshot)
 
-	return fs, err
+	return fs, nil
 }
 
 func (fs *FilerServer) checkWithMaster() {