support enable/disable vacuum (#4087)

* stop vacuum

* suspend/resume vacuum

* remove unused code

* rename

* rename param

weed/topology/topology.go

@@ -35,6 +35,7 @@ type Topology struct {
 
 	volumeSizeLimit  uint64
 	replicationAsMin bool
+	isDisableVacuum     bool
 
 	Sequence sequence.Sequencer
 
@@ -338,3 +339,13 @@ func (t *Topology) DataNodeRegistration(dcName, rackName string, dn *DataNode) {
 	rack.LinkChildNode(dn)
 	glog.Infof("[%s] reLink To topo  ", dn.Id())
 }
+
+func (t *Topology) DisableVacuum() {
+	glog.V(0).Infof("DisableVacuum")
+	t.isDisableVacuum = true
+}
+
+func (t *Topology) EnableVacuum() {
+	glog.V(0).Infof("EnableVacuum")
+	t.isDisableVacuum = false
+}

weed/topology/topology_event_handling.go

@@ -1,12 +1,13 @@
 package topology
 
 import (
+	"math/rand"
+	"time"
+
 	"github.com/seaweedfs/seaweedfs/weed/stats"
 	"github.com/seaweedfs/seaweedfs/weed/storage/erasure_coding"
 	"github.com/seaweedfs/seaweedfs/weed/storage/types"
 	"google.golang.org/grpc"
-	"math/rand"
-	"time"
 
 	"github.com/seaweedfs/seaweedfs/weed/glog"
 	"github.com/seaweedfs/seaweedfs/weed/storage"
@@ -25,7 +26,9 @@ func (t *Topology) StartRefreshWritableVolumes(grpcDialOption grpc.DialOption, g
 	go func(garbageThreshold float64) {
 		for {
 			if t.IsLeader() {
-				t.Vacuum(grpcDialOption, garbageThreshold, 0, "", preallocate)
+				if !t.isDisableVacuum {
+					t.Vacuum(grpcDialOption, garbageThreshold, 0, "", preallocate)
+				}
 			} else {
 				stats.MasterReplicaPlacementMismatch.Reset()
 			}