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

https://github.com/seaweedfs/seaweedfs/commit/d8c574a5ef1a811f9a0d447097d9edfcc0c1d84c#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!")