volume vacuum: avoid timeout with streaming progress report

fix https://github.com/chrislusf/seaweedfs/issues/2396

weed/topology/topology_vacuum.go

@@ -3,6 +3,7 @@ package topology
 import (
 	"context"
 	"github.com/chrislusf/seaweedfs/weed/pb"
+	"io"
 	"sync/atomic"
 	"time"
 
@@ -70,11 +71,26 @@ func (t *Topology) batchVacuumVolumeCompact(grpcDialOption grpc.DialOption, vl *
 		go func(index int, url pb.ServerAddress, vid needle.VolumeId) {
 			glog.V(0).Infoln(index, "Start vacuuming", vid, "on", url)
 			err := operation.WithVolumeServerClient(url, grpcDialOption, func(volumeServerClient volume_server_pb.VolumeServerClient) error {
-				_, err := volumeServerClient.VacuumVolumeCompact(context.Background(), &volume_server_pb.VacuumVolumeCompactRequest{
+				stream, err := volumeServerClient.VacuumVolumeCompact(context.Background(), &volume_server_pb.VacuumVolumeCompactRequest{
 					VolumeId:    uint32(vid),
 					Preallocate: preallocate,
 				})
-				return err
+				if err != nil {
+					return err
+				}
+
+				for {
+					resp, recvErr := stream.Recv()
+					if recvErr != nil {
+						if recvErr == io.EOF {
+							break
+						} else {
+							return recvErr
+						}
+					}
+					glog.V(0).Infof("%d vacuum %d on %s processed %d bytes", index, vid, url, resp.ProcessedBytes)
+				}
+				return nil
 			})
 			if err != nil {
 				glog.Errorf("Error when vacuuming %d on %s: %v", vid, url, err)