[master] avoid vacuum if not enough replica copies (#3924)

avoid vacuum if not enough replica copies

weed/topology/topology_vacuum.go

@@ -187,8 +187,12 @@ func (t *Topology) Vacuum(grpcDialOption grpc.DialOption, garbageThreshold float
 			if vl != nil {
 				volumeLayout := vl.(*VolumeLayout)
 				if volumeId > 0 {
-					if volumeLayout.Lookup(needle.VolumeId(volumeId)) != nil {
-						t.vacuumOneVolumeLayout(grpcDialOption, volumeLayout, c, garbageThreshold, preallocate)
+					vid := needle.VolumeId(volumeId)
+					volumeLayout.accessLock.RLock()
+					locationList, ok := volumeLayout.vid2location[vid]
+					volumeLayout.accessLock.RUnlock()
+					if ok {
+						t.vacuumOneVolumeId(grpcDialOption, volumeLayout, c, garbageThreshold, locationList, vid, preallocate)
 					}
 				} else {
 					t.vacuumOneVolumeLayout(grpcDialOption, volumeLayout, c, garbageThreshold, preallocate)
@@ -208,13 +212,18 @@ func (t *Topology) vacuumOneVolumeLayout(grpcDialOption grpc.DialOption, volumeL
 	volumeLayout.accessLock.RUnlock()
 
 	for vid, locationList := range tmpMap {
+		t.vacuumOneVolumeId(grpcDialOption, volumeLayout, c, garbageThreshold, locationList, vid, preallocate)
+	}
+}
 
+func (t *Topology) vacuumOneVolumeId(grpcDialOption grpc.DialOption, volumeLayout *VolumeLayout, c *Collection, garbageThreshold float64, locationList *VolumeLocationList, vid needle.VolumeId, preallocate int64) {
 	volumeLayout.accessLock.RLock()
 	isReadOnly := volumeLayout.readonlyVolumes.IsTrue(vid)
+	isEnoughCopies := volumeLayout.enoughCopies(vid)
 	volumeLayout.accessLock.RUnlock()
 
-		if isReadOnly {
-			continue
+	if isReadOnly || !isEnoughCopies {
+		return
 	}
 
 	glog.V(2).Infof("check vacuum on collection:%s volume:%d", c.Name, vid)
@@ -227,4 +236,3 @@ func (t *Topology) vacuumOneVolumeLayout(grpcDialOption grpc.DialOption, volumeL
 		}
 	}
 }
-}