Using filer.remote.sync concurrency in filer.remote.gateway (#5123)

- Chnaged ProcessEvenFn to be concurrent just like filer.remote.sync

Co-authored-by: itsfarbod <itsfarbod@hamravesh.com>

weed/command/filer_remote_gateway_buckets.go

@@ -30,10 +30,20 @@ func (option *RemoteGatewayOptions) followBucketUpdatesAndUploadToRemote(filerSo
 		return err
 	}
 
-	processEventFnWithOffset := pb.AddOffsetFunc(eachEntryFunc, 3*time.Second, func(counter int64, lastTsNs int64) error {
-		lastTime := time.Unix(0, lastTsNs)
-		glog.V(0).Infof("remote sync %s progressed to %v %0.2f/sec", *option.filerAddress, lastTime, float64(counter)/float64(3))
-		return remote_storage.SetSyncOffset(option.grpcDialOption, pb.ServerAddress(*option.filerAddress), option.bucketsDir, lastTsNs)
+	processor := NewMetadataProcessor(eachEntryFunc, 128)
+
+	var lastLogTsNs = time.Now().UnixNano()
+	processEventFnWithOffset := pb.AddOffsetFunc(func(resp *filer_pb.SubscribeMetadataResponse) error {
+		processor.AddSyncJob(resp)
+		return nil
+	}, 3*time.Second, func(counter int64, lastTsNs int64) error {
+		if processor.processedTsWatermark == 0 {
+			return nil
+		}
+		now := time.Now().UnixNano()
+		glog.V(0).Infof("remote sync %s progressed to %v %0.2f/sec", *option.filerAddress, time.Unix(0, processor.processedTsWatermark), float64(counter)/(float64(now-lastLogTsNs)/1e9))
+		lastLogTsNs = now
+		return remote_storage.SetSyncOffset(option.grpcDialOption, pb.ServerAddress(*option.filerAddress), option.bucketsDir, processor.processedTsWatermark)
 	})
 
 	lastOffsetTs := collectLastSyncOffset(option, option.grpcDialOption, pb.ServerAddress(*option.filerAddress), option.bucketsDir, *option.timeAgo)