Added treat_replication_as_minimums master toml option

weed/command/scaffold.go

@@ -394,5 +394,13 @@ copy_2 = 6                # create 2 x 6 = 12 actual volumes
 copy_3 = 3                # create 3 x 3 = 9 actual volumes
 copy_other = 1            # create n x 1 = n actual volumes
 
+# configuration flags for replication
+[master.replication]
+# any replication counts should be considered minimums. If you specify 010 and
+# have 3 different racks, that's still considered writable. Writes will still
+# try to replicate to all available volumes. You should only use this option
+# if you are doing your own replication or periodic sync of volumes.
+treat_replication_as_minimums = false
+
 `
 )

weed/server/master_server.go

@@ -77,6 +77,9 @@ func NewMasterServer(r *mux.Router, option *MasterOption, peers []string) *Maste
 	v.SetDefault("jwt.signing.read.expires_after_seconds", 60)
 	readExpiresAfterSec := v.GetInt("jwt.signing.read.expires_after_seconds")
 
+	v.SetDefault("master.replication.treat_replication_as_minimums", false)
+	replicationAsMin := v.GetBool("master.replication.treat_replication_as_minimums")
+
 	var preallocateSize int64
 	if option.VolumePreallocate {
 		preallocateSize = int64(option.VolumeSizeLimitMB) * (1 << 20)
@@ -96,7 +99,7 @@ func NewMasterServer(r *mux.Router, option *MasterOption, peers []string) *Maste
 	if nil == seq {
 		glog.Fatalf("create sequencer failed.")
 	}
-	ms.Topo = topology.NewTopology("topo", seq, uint64(ms.option.VolumeSizeLimitMB)*1024*1024, ms.option.PulseSeconds)
+	ms.Topo = topology.NewTopology("topo", seq, uint64(ms.option.VolumeSizeLimitMB)*1024*1024, ms.option.PulseSeconds, replicationAsMin)
 	ms.vg = topology.NewDefaultVolumeGrowth()
 	glog.V(0).Infoln("Volume Size Limit is", ms.option.VolumeSizeLimitMB, "MB")
 

weed/topology/collection.go

@@ -11,11 +11,16 @@ import (
 type Collection struct {
 	Name                     string
 	volumeSizeLimit          uint64
+	replicationAsMin         bool
 	storageType2VolumeLayout *util.ConcurrentReadMap
 }
 
-func NewCollection(name string, volumeSizeLimit uint64) *Collection {
-	c := &Collection{Name: name, volumeSizeLimit: volumeSizeLimit}
+func NewCollection(name string, volumeSizeLimit uint64, replicationAsMin bool) *Collection {
+	c := &Collection{
+		Name:             name,
+		volumeSizeLimit:  volumeSizeLimit,
+		replicationAsMin: replicationAsMin,
+	}
 	c.storageType2VolumeLayout = util.NewConcurrentReadMap()
 	return c
 }
@@ -30,7 +35,7 @@ func (c *Collection) GetOrCreateVolumeLayout(rp *super_block.ReplicaPlacement, t
 		keyString += ttl.String()
 	}
 	vl := c.storageType2VolumeLayout.Get(keyString, func() interface{} {
-		return NewVolumeLayout(rp, ttl, c.volumeSizeLimit)
+		return NewVolumeLayout(rp, ttl, c.volumeSizeLimit, c.replicationAsMin)
 	})
 	return vl.(*VolumeLayout)
 }

weed/topology/topology.go

@@ -27,7 +27,8 @@ type Topology struct {
 
 	pulse int64
 
-	volumeSizeLimit uint64
+	volumeSizeLimit  uint64
+	replicationAsMin bool
 
 	Sequence sequence.Sequencer
 
@@ -38,7 +39,7 @@ type Topology struct {
 	RaftServer raft.Server
 }
 
-func NewTopology(id string, seq sequence.Sequencer, volumeSizeLimit uint64, pulse int) *Topology {
+func NewTopology(id string, seq sequence.Sequencer, volumeSizeLimit uint64, pulse int, replicationAsMin bool) *Topology {
 	t := &Topology{}
 	t.id = NodeId(id)
 	t.nodeType = "Topology"
@@ -48,6 +49,7 @@ func NewTopology(id string, seq sequence.Sequencer, volumeSizeLimit uint64, puls
 	t.ecShardMap = make(map[needle.VolumeId]*EcShardLocations)
 	t.pulse = int64(pulse)
 	t.volumeSizeLimit = volumeSizeLimit
+	t.replicationAsMin = replicationAsMin
 
 	t.Sequence = seq
 
@@ -138,7 +140,7 @@ func (t *Topology) PickForWrite(count uint64, option *VolumeGrowOption) (string,
 
 func (t *Topology) GetVolumeLayout(collectionName string, rp *super_block.ReplicaPlacement, ttl *needle.TTL) *VolumeLayout {
 	return t.collectionMap.Get(collectionName, func() interface{} {
-		return NewCollection(collectionName, t.volumeSizeLimit)
+		return NewCollection(collectionName, t.volumeSizeLimit, t.replicationAsMin)
 	}).(*Collection).GetOrCreateVolumeLayout(rp, ttl)
 }
 

weed/topology/topology_test.go

@@ -23,7 +23,7 @@ func TestRemoveDataCenter(t *testing.T) {
 }
 
 func TestHandlingVolumeServerHeartbeat(t *testing.T) {
-	topo := NewTopology("weedfs", sequence.NewMemorySequencer(), 32*1024, 5)
+	topo := NewTopology("weedfs", sequence.NewMemorySequencer(), 32*1024, 5, false)
 
 	dc := topo.GetOrCreateDataCenter("dc1")
 	rack := dc.GetOrCreateRack("rack1")
@@ -140,7 +140,7 @@ func assert(t *testing.T, message string, actual, expected int) {
 
 func TestAddRemoveVolume(t *testing.T) {
 
-	topo := NewTopology("weedfs", sequence.NewMemorySequencer(), 32*1024, 5)
+	topo := NewTopology("weedfs", sequence.NewMemorySequencer(), 32*1024, 5, false)
 
 	dc := topo.GetOrCreateDataCenter("dc1")
 	rack := dc.GetOrCreateRack("rack1")

weed/topology/volume_growth_test.go

@@ -81,7 +81,7 @@ func setup(topologyLayout string) *Topology {
 	fmt.Println("data:", data)
 
 	//need to connect all nodes first before server adding volumes
-	topo := NewTopology("weedfs", sequence.NewMemorySequencer(), 32*1024, 5)
+	topo := NewTopology("weedfs", sequence.NewMemorySequencer(), 32*1024, 5, false)
 	mTopology := data.(map[string]interface{})
 	for dcKey, dcValue := range mTopology {
 		dc := NewDataCenter(dcKey)

weed/topology/volume_layout.go

@@ -22,6 +22,7 @@ type VolumeLayout struct {
 	readonlyVolumes  map[needle.VolumeId]bool // transient set of readonly volumes
 	oversizedVolumes map[needle.VolumeId]bool // set of oversized volumes
 	volumeSizeLimit  uint64
+	replicationAsMin bool
 	accessLock       sync.RWMutex
 }
 
@@ -31,7 +32,7 @@ type VolumeLayoutStats struct {
 	FileCount uint64
 }
 
-func NewVolumeLayout(rp *super_block.ReplicaPlacement, ttl *needle.TTL, volumeSizeLimit uint64) *VolumeLayout {
+func NewVolumeLayout(rp *super_block.ReplicaPlacement, ttl *needle.TTL, volumeSizeLimit uint64, replicationAsMin bool) *VolumeLayout {
 	return &VolumeLayout{
 		rp:               rp,
 		ttl:              ttl,
@@ -40,6 +41,7 @@ func NewVolumeLayout(rp *super_block.ReplicaPlacement, ttl *needle.TTL, volumeSi
 		readonlyVolumes:  make(map[needle.VolumeId]bool),
 		oversizedVolumes: make(map[needle.VolumeId]bool),
 		volumeSizeLimit:  volumeSizeLimit,
+		replicationAsMin: replicationAsMin,
 	}
 }
 
@@ -107,7 +109,7 @@ func (vl *VolumeLayout) UnRegisterVolume(v *storage.VolumeInfo, dn *DataNode) {
 }
 
 func (vl *VolumeLayout) ensureCorrectWritables(v *storage.VolumeInfo) {
-	if vl.vid2location[v.Id].Length() == vl.rp.GetCopyCount() && vl.isWritable(v) {
+	if vl.enoughCopies(v.Id) && vl.isWritable(v) {
 		if _, ok := vl.oversizedVolumes[v.Id]; !ok {
 			vl.setVolumeWritable(v.Id)
 		}
@@ -272,12 +274,18 @@ func (vl *VolumeLayout) SetVolumeAvailable(dn *DataNode, vid needle.VolumeId, is
 		return false
 	}
 
-	if vl.vid2location[vid].Length() == vl.rp.GetCopyCount() {
+	if vl.enoughCopies(vid) {
 		return vl.setVolumeWritable(vid)
 	}
 	return false
 }
 
+func (vl *VolumeLayout) enoughCopies(vid needle.VolumeId) bool {
+	locations := vl.vid2location[vid].Length()
+	desired := vl.rp.GetCopyCount()
+	return locations == desired || (vl.replicationAsMin && locations > desired)
+}
+
 func (vl *VolumeLayout) SetVolumeCapacityFull(vid needle.VolumeId) bool {
 	vl.accessLock.Lock()
 	defer vl.accessLock.Unlock()