the isFsync parameter is essentially IsAsyncWrite and it needs to be turned off if s.isStopping

d8c574a5ef (r159132764)

weed/storage/store.go

@@ -441,7 +441,7 @@ func (s *Store) WriteVolumeNeedle(i needle.VolumeId, n *needle.Needle, checkCook
 			err = fmt.Errorf("volume %d is read only", i)
 			return
 		}
-		_, _, isUnchanged, err = v.writeNeedle2(n, checkCookie, fsync || s.isStopping)
+		_, _, isUnchanged, err = v.writeNeedle2(n, checkCookie, fsync && !s.isStopping)
 		return
 	}
 	glog.V(0).Infoln("volume", i, "not found!")