add parallel vacuuming

weed/command/master.go

@@ -44,6 +44,7 @@ type MasterOptions struct {
 	peers                      *string
 	volumeSizeLimitMB          *uint
 	volumePreallocate          *bool
+	maxParallelVacuumPerServer *int
 	// pulseSeconds       *int
 	defaultReplication *string
 	garbageThreshold   *float64
@@ -70,6 +71,7 @@ func init() {
 	m.peers = cmdMaster.Flag.String("peers", "", "all master nodes in comma separated ip:port list, example: 127.0.0.1:9093,127.0.0.1:9094,127.0.0.1:9095")
 	m.volumeSizeLimitMB = cmdMaster.Flag.Uint("volumeSizeLimitMB", 30*1000, "Master stops directing writes to oversized volumes.")
 	m.volumePreallocate = cmdMaster.Flag.Bool("volumePreallocate", false, "Preallocate disk space for volumes.")
+	m.maxParallelVacuumPerServer = cmdMaster.Flag.Int("maxParallelVacuumPerServer", 1, "maximum number of volumes to vacuum in parallel per volume server")
 	// m.pulseSeconds = cmdMaster.Flag.Int("pulseSeconds", 5, "number of seconds between heartbeats")
 	m.defaultReplication = cmdMaster.Flag.String("defaultReplication", "", "Default replication type if not specified.")
 	m.garbageThreshold = cmdMaster.Flag.Float64("garbageThreshold", 0.3, "threshold to vacuum and reclaim spaces")
@@ -315,6 +317,7 @@ func (m *MasterOptions) toMasterOption(whiteList []string) *weed_server.MasterOp
 		MetaFolder:                 *m.metaFolder,
 		VolumeSizeLimitMB:          uint32(*m.volumeSizeLimitMB),
 		VolumePreallocate:          *m.volumePreallocate,
+		MaxParallelVacuumPerServer: *m.maxParallelVacuumPerServer,
 		// PulseSeconds:            *m.pulseSeconds,
 		DefaultReplicaPlacement: *m.defaultReplication,
 		GarbageThreshold:        *m.garbageThreshold,

weed/command/server.go

@@ -92,6 +92,7 @@ func init() {
 	masterOptions.peers = cmdServer.Flag.String("master.peers", "", "all master nodes in comma separated ip:masterPort list")
 	masterOptions.volumeSizeLimitMB = cmdServer.Flag.Uint("master.volumeSizeLimitMB", 30*1000, "Master stops directing writes to oversized volumes.")
 	masterOptions.volumePreallocate = cmdServer.Flag.Bool("master.volumePreallocate", false, "Preallocate disk space for volumes.")
+	masterOptions.maxParallelVacuumPerServer = cmdServer.Flag.Int("master.maxParallelVacuumPerServer", 1, "maximum number of volumes to vacuum in parallel on one volume server")
 	masterOptions.defaultReplication = cmdServer.Flag.String("master.defaultReplication", "", "Default replication type if not specified.")
 	masterOptions.garbageThreshold = cmdServer.Flag.Float64("master.garbageThreshold", 0.3, "threshold to vacuum and reclaim spaces")
 	masterOptions.metricsAddress = cmdServer.Flag.String("master.metrics.address", "", "Prometheus gateway address")

weed/server/master_grpc_server_volume.go

@@ -221,7 +221,7 @@ func (ms *MasterServer) VacuumVolume(ctx context.Context, req *master_pb.VacuumV
 
 	resp := &master_pb.VacuumVolumeResponse{}
 
-	ms.Topo.Vacuum(ms.grpcDialOption, float64(req.GarbageThreshold), req.VolumeId, req.Collection, ms.preallocateSize)
+	ms.Topo.Vacuum(ms.grpcDialOption, float64(req.GarbageThreshold), ms.option.MaxParallelVacuumPerServer, req.VolumeId, req.Collection, ms.preallocateSize)
 
 	return resp, nil
 }

weed/server/master_server.go

@@ -29,8 +29,8 @@ import (
 	"github.com/seaweedfs/seaweedfs/weed/shell"
 	"github.com/seaweedfs/seaweedfs/weed/topology"
 	"github.com/seaweedfs/seaweedfs/weed/util"
-	"github.com/seaweedfs/seaweedfs/weed/wdclient"
 	util_http "github.com/seaweedfs/seaweedfs/weed/util/http"
+	"github.com/seaweedfs/seaweedfs/weed/wdclient"
 )
 
 const (
@@ -43,6 +43,7 @@ type MasterOption struct {
 	MetaFolder                 string
 	VolumeSizeLimitMB          uint32
 	VolumePreallocate          bool
+	MaxParallelVacuumPerServer int
 	// PulseSeconds            int
 	DefaultReplicaPlacement string
 	GarbageThreshold        float64
@@ -158,6 +159,7 @@ func NewMasterServer(r *mux.Router, option *MasterOption, peers map[string]pb.Se
 	ms.Topo.StartRefreshWritableVolumes(
 		ms.grpcDialOption,
 		ms.option.GarbageThreshold,
+		ms.option.MaxParallelVacuumPerServer,
 		topology.VolumeGrowStrategy.Threshold,
 		ms.preallocateSize,
 	)

weed/server/master_server_handlers_admin.go

@@ -66,7 +66,7 @@ func (ms *MasterServer) volumeVacuumHandler(w http.ResponseWriter, r *http.Reque
 		}
 	}
 	// glog.Infoln("garbageThreshold =", gcThreshold)
-	ms.Topo.Vacuum(ms.grpcDialOption, gcThreshold, 0, "", ms.preallocateSize)
+	ms.Topo.Vacuum(ms.grpcDialOption, gcThreshold, ms.option.MaxParallelVacuumPerServer, 0, "", ms.preallocateSize)
 	ms.dirStatusHandler(w, r)
 }
 

weed/topology/topology_event_handling.go

@@ -13,7 +13,7 @@ import (
 	"github.com/seaweedfs/seaweedfs/weed/storage"
 )
 
-func (t *Topology) StartRefreshWritableVolumes(grpcDialOption grpc.DialOption, garbageThreshold float64, growThreshold float64, preallocate int64) {
+func (t *Topology) StartRefreshWritableVolumes(grpcDialOption grpc.DialOption, garbageThreshold float64, concurrentVacuumLimitPerVolumeServer int, growThreshold float64, preallocate int64) {
 	go func() {
 		for {
 			if t.IsLeader() {
@@ -27,7 +27,7 @@ func (t *Topology) StartRefreshWritableVolumes(grpcDialOption grpc.DialOption, g
 		for {
 			if t.IsLeader() {
 				if !t.isDisableVacuum {
-					t.Vacuum(grpcDialOption, garbageThreshold, 0, "", preallocate)
+					t.Vacuum(grpcDialOption, garbageThreshold, concurrentVacuumLimitPerVolumeServer, 0, "", preallocate)
 				}
 			} else {
 				stats.MasterReplicaPlacementMismatch.Reset()

weed/topology/topology_vacuum.go

@@ -2,7 +2,9 @@ package topology
 
 import (
 	"context"
+	"github.com/seaweedfs/seaweedfs/weed/util"
 	"io"
+	"sync"
 	"sync/atomic"
 	"time"
 
@@ -213,7 +215,7 @@ func (t *Topology) batchVacuumVolumeCleanup(grpcDialOption grpc.DialOption, vl *
 	}
 }
 
-func (t *Topology) Vacuum(grpcDialOption grpc.DialOption, garbageThreshold float64, volumeId uint32, collection string, preallocate int64) {
+func (t *Topology) Vacuum(grpcDialOption grpc.DialOption, garbageThreshold float64, maxParallelVacuumPerServer int, volumeId uint32, collection string, preallocate int64) {
 
 	// if there is vacuum going on, return immediately
 	swapped := atomic.CompareAndSwapInt64(&t.vacuumLockCounter, 0, 1)
@@ -243,25 +245,83 @@ func (t *Topology) Vacuum(grpcDialOption grpc.DialOption, garbageThreshold float
 						t.vacuumOneVolumeId(grpcDialOption, volumeLayout, c, garbageThreshold, locationList, vid, preallocate)
 					}
 				} else {
-					t.vacuumOneVolumeLayout(grpcDialOption, volumeLayout, c, garbageThreshold, preallocate)
+					t.vacuumOneVolumeLayout(grpcDialOption, volumeLayout, c, garbageThreshold, maxParallelVacuumPerServer, preallocate)
 				}
 			}
 		}
 	}
 }
 
-func (t *Topology) vacuumOneVolumeLayout(grpcDialOption grpc.DialOption, volumeLayout *VolumeLayout, c *Collection, garbageThreshold float64, preallocate int64) {
+func (t *Topology) vacuumOneVolumeLayout(grpcDialOption grpc.DialOption, volumeLayout *VolumeLayout, c *Collection, garbageThreshold float64, maxParallelVacuumPerServer int, preallocate int64) {
 
 	volumeLayout.accessLock.RLock()
-	tmpMap := make(map[needle.VolumeId]*VolumeLocationList)
+	todoVolumeMap := make(map[needle.VolumeId]*VolumeLocationList)
 	for vid, locationList := range volumeLayout.vid2location {
-		tmpMap[vid] = locationList.Copy()
+		todoVolumeMap[vid] = locationList.Copy()
 	}
 	volumeLayout.accessLock.RUnlock()
 
-	for vid, locationList := range tmpMap {
+	// limiter for each volume server
+	limiter := make(map[NodeId]int)
+	var limiterLock sync.Mutex
+	for _, locationList := range todoVolumeMap {
+		for _, dn := range locationList.list {
+			if _, ok := limiter[dn.Id()]; !ok {
+				limiter[dn.Id()] = maxParallelVacuumPerServer
+			}
+		}
+	}
+
+	executor := util.NewLimitedConcurrentExecutor(100)
+
+	var wg sync.WaitGroup
+
+	for len(todoVolumeMap) > 0 {
+		pendingVolumeMap := make(map[needle.VolumeId]*VolumeLocationList)
+		for vid, locationList := range todoVolumeMap {
+			hasEnoughQuota := true
+			for _, dn := range locationList.list {
+				limiterLock.Lock()
+				quota := limiter[dn.Id()]
+				limiterLock.Unlock()
+				if quota <= 0 {
+					hasEnoughQuota = false
+					break
+				}
+			}
+			if !hasEnoughQuota {
+				pendingVolumeMap[vid] = locationList
+				continue
+			}
+
+			// debit the quota
+			for _, dn := range locationList.list {
+				limiterLock.Lock()
+				limiter[dn.Id()]--
+				limiterLock.Unlock()
+			}
+
+			wg.Add(1)
+			executor.Execute(func() {
+				defer wg.Done()
 				t.vacuumOneVolumeId(grpcDialOption, volumeLayout, c, garbageThreshold, locationList, vid, preallocate)
+				// credit the quota
+				for _, dn := range locationList.list {
+					limiterLock.Lock()
+					limiter[dn.Id()]++
+					limiterLock.Unlock()
+				}
+			})
+		}
+
+		if len(todoVolumeMap) == len(pendingVolumeMap) {
+			time.Sleep(10 * time.Second)
 		}
+		todoVolumeMap = pendingVolumeMap
+	}
+
+	wg.Wait()
+
 }
 
 func (t *Topology) vacuumOneVolumeId(grpcDialOption grpc.DialOption, volumeLayout *VolumeLayout, c *Collection, garbageThreshold float64, locationList *VolumeLocationList, vid needle.VolumeId, preallocate int64) {