diff --git a/weed/cluster/cluster.go b/weed/cluster/cluster.go
index 348646f04..08ff97198 100644
--- a/weed/cluster/cluster.go
+++ b/weed/cluster/cluster.go
@@ -10,7 +10,8 @@ import (
 
 const (
 	MasterType = "master"
-	FilerType = "filer"
+	FilerType  = "filer"
+	BrokerType = "broker"
 )
 
 type ClusterNode struct {
@@ -25,34 +26,34 @@ type Leaders struct {
 }
 
 type Cluster struct {
-	nodes     map[pb.ServerAddress]*ClusterNode
-	nodesLock sync.RWMutex
-	leaders   *Leaders
+	filers       map[pb.ServerAddress]*ClusterNode
+	filersLock   sync.RWMutex
+	filerLeaders *Leaders
 }
 
 func NewCluster() *Cluster {
 	return &Cluster{
-		nodes:   make(map[pb.ServerAddress]*ClusterNode),
-		leaders: &Leaders{},
+		filers:       make(map[pb.ServerAddress]*ClusterNode),
+		filerLeaders: &Leaders{},
 	}
 }
 
 func (cluster *Cluster) AddClusterNode(nodeType string, address pb.ServerAddress, version string) []*master_pb.KeepConnectedResponse {
 	switch nodeType {
 	case FilerType:
-		cluster.nodesLock.Lock()
-		defer cluster.nodesLock.Unlock()
-		if existingNode, found := cluster.nodes[address]; found {
+		cluster.filersLock.Lock()
+		defer cluster.filersLock.Unlock()
+		if existingNode, found := cluster.filers[address]; found {
 			existingNode.counter++
 			return nil
 		}
-		cluster.nodes[address] = &ClusterNode{
+		cluster.filers[address] = &ClusterNode{
 			Address:   address,
 			Version:   version,
 			counter:   1,
 			createdTs: time.Now(),
 		}
-		return cluster.ensureLeader(true, nodeType, address)
+		return cluster.ensureFilerLeaders(true, nodeType, address)
 	case MasterType:
 	}
 	return nil
@@ -61,15 +62,15 @@ func (cluster *Cluster) AddClusterNode(nodeType string, address pb.ServerAddress
 func (cluster *Cluster) RemoveClusterNode(nodeType string, address pb.ServerAddress) []*master_pb.KeepConnectedResponse {
 	switch nodeType {
 	case FilerType:
-		cluster.nodesLock.Lock()
-		defer cluster.nodesLock.Unlock()
-		if existingNode, found := cluster.nodes[address]; !found {
+		cluster.filersLock.Lock()
+		defer cluster.filersLock.Unlock()
+		if existingNode, found := cluster.filers[address]; !found {
 			return nil
 		} else {
 			existingNode.counter--
 			if existingNode.counter <= 0 {
-				delete(cluster.nodes, address)
-				return cluster.ensureLeader(false, nodeType, address)
+				delete(cluster.filers, address)
+				return cluster.ensureFilerLeaders(false, nodeType, address)
 			}
 		}
 	case MasterType:
@@ -80,9 +81,9 @@ func (cluster *Cluster) RemoveClusterNode(nodeType string, address pb.ServerAddr
 func (cluster *Cluster) ListClusterNode(nodeType string) (nodes []*ClusterNode) {
 	switch nodeType {
 	case FilerType:
-		cluster.nodesLock.RLock()
-		defer cluster.nodesLock.RUnlock()
-		for _, node := range cluster.nodes {
+		cluster.filersLock.RLock()
+		defer cluster.filersLock.RUnlock()
+		for _, node := range cluster.filers {
 			nodes = append(nodes, node)
 		}
 	case MasterType:
@@ -91,12 +92,12 @@ func (cluster *Cluster) ListClusterNode(nodeType string) (nodes []*ClusterNode)
 }
 
 func (cluster *Cluster) IsOneLeader(address pb.ServerAddress) bool {
-	return cluster.leaders.isOneLeader(address)
+	return cluster.filerLeaders.isOneLeader(address)
 }
 
-func (cluster *Cluster) ensureLeader(isAdd bool, nodeType string, address pb.ServerAddress) (result []*master_pb.KeepConnectedResponse) {
+func (cluster *Cluster) ensureFilerLeaders(isAdd bool, nodeType string, address pb.ServerAddress) (result []*master_pb.KeepConnectedResponse) {
 	if isAdd {
-		if cluster.leaders.addLeaderIfVacant(address) {
+		if cluster.filerLeaders.addLeaderIfVacant(address) {
 			// has added the address as one leader
 			result = append(result, &master_pb.KeepConnectedResponse{
 				ClusterNodeUpdate: &master_pb.ClusterNodeUpdate{
@@ -117,7 +118,7 @@ func (cluster *Cluster) ensureLeader(isAdd bool, nodeType string, address pb.Ser
 			})
 		}
 	} else {
-		if cluster.leaders.removeLeaderIfExists(address) {
+		if cluster.filerLeaders.removeLeaderIfExists(address) {
 
 			result = append(result, &master_pb.KeepConnectedResponse{
 				ClusterNodeUpdate: &master_pb.ClusterNodeUpdate{
@@ -132,8 +133,8 @@ func (cluster *Cluster) ensureLeader(isAdd bool, nodeType string, address pb.Ser
 			var shortestDuration int64 = math.MaxInt64
 			now := time.Now()
 			var candidateAddress pb.ServerAddress
-			for _, node := range cluster.nodes {
-				if cluster.leaders.isOneLeader(node.Address) {
+			for _, node := range cluster.filers {
+				if cluster.filerLeaders.isOneLeader(node.Address) {
 					continue
 				}
 				duration := now.Sub(node.createdTs).Nanoseconds()
@@ -143,7 +144,7 @@ func (cluster *Cluster) ensureLeader(isAdd bool, nodeType string, address pb.Ser
 				}
 			}
 			if candidateAddress != "" {
-				cluster.leaders.addLeaderIfVacant(candidateAddress)
+				cluster.filerLeaders.addLeaderIfVacant(candidateAddress)
 				// added a new leader
 				result = append(result, &master_pb.KeepConnectedResponse{
 					ClusterNodeUpdate: &master_pb.ClusterNodeUpdate{
diff --git a/weed/cluster/cluster_test.go b/weed/cluster/cluster_test.go
index dd68d59b9..b56ee501c 100644
--- a/weed/cluster/cluster_test.go
+++ b/weed/cluster/cluster_test.go
@@ -14,7 +14,7 @@ func TestClusterAddRemoveNodes(t *testing.T) {
 	assert.Equal(t, []pb.ServerAddress{
 		pb.ServerAddress("111:1"),
 		pb.ServerAddress("111:2"),
-	}, c.leaders.GetLeaders())
+	}, c.filerLeaders.GetLeaders())
 
 	c.AddClusterNode("filer", pb.ServerAddress("111:3"), "23.45")
 	c.AddClusterNode("filer", pb.ServerAddress("111:4"), "23.45")
@@ -22,7 +22,7 @@ func TestClusterAddRemoveNodes(t *testing.T) {
 		pb.ServerAddress("111:1"),
 		pb.ServerAddress("111:2"),
 		pb.ServerAddress("111:3"),
-	}, c.leaders.GetLeaders())
+	}, c.filerLeaders.GetLeaders())
 
 	c.AddClusterNode("filer", pb.ServerAddress("111:5"), "23.45")
 	c.AddClusterNode("filer", pb.ServerAddress("111:6"), "23.45")
@@ -31,7 +31,7 @@ func TestClusterAddRemoveNodes(t *testing.T) {
 		pb.ServerAddress("111:1"),
 		pb.ServerAddress("111:2"),
 		pb.ServerAddress("111:3"),
-	}, c.leaders.GetLeaders())
+	}, c.filerLeaders.GetLeaders())
 
 	// remove oldest
 	c.RemoveClusterNode("filer", pb.ServerAddress("111:1"))
@@ -39,7 +39,7 @@ func TestClusterAddRemoveNodes(t *testing.T) {
 		pb.ServerAddress("111:6"),
 		pb.ServerAddress("111:2"),
 		pb.ServerAddress("111:3"),
-	}, c.leaders.GetLeaders())
+	}, c.filerLeaders.GetLeaders())
 
 	// remove oldest
 	c.RemoveClusterNode("filer", pb.ServerAddress("111:1"))