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shell: add volume.balance command

pull/991/head
Chris Lu 6 years ago
parent
3f2a30bd05
commit
3ff92037cc
4 changed files with 317 additions and 95 deletions
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  1. 1
      weed/pb/master.proto
  2. 197
      weed/pb/master_pb/master.pb.go
  3. 3
      weed/server/master_grpc_server_volume.go
  4. 211
      weed/shell/command_volume_balance.go

1
weed/pb/master.proto
View File

@ -202,4 +202,5 @@ message VolumeListRequest {
}
message VolumeListResponse {
TopologyInfo topology_info = 1;
uint64 volume_size_limit_mb = 2;
}

197
weed/pb/master_pb/master.pb.go
View File

@ -1068,7 +1068,8 @@ func (*VolumeListRequest) ProtoMessage() {}
func (*VolumeListRequest) Descriptor() ([]byte, []int) { return fileDescriptor0, []int{25} }
type VolumeListResponse struct {
TopologyInfo *TopologyInfo `protobuf:"bytes,1,opt,name=topology_info,json=topologyInfo" json:"topology_info,omitempty"`
TopologyInfo *TopologyInfo `protobuf:"bytes,1,opt,name=topology_info,json=topologyInfo" json:"topology_info,omitempty"`
VolumeSizeLimitMb uint64 `protobuf:"varint,2,opt,name=volume_size_limit_mb,json=volumeSizeLimitMb" json:"volume_size_limit_mb,omitempty"`
}
func (m *VolumeListResponse) Reset() { *m = VolumeListResponse{} }
@ -1083,6 +1084,13 @@ func (m *VolumeListResponse) GetTopologyInfo() *TopologyInfo {
return nil
}
func (m *VolumeListResponse) GetVolumeSizeLimitMb() uint64 {
if m != nil {
return m.VolumeSizeLimitMb
}
return 0
}
func init() {
proto.RegisterType((*Heartbeat)(nil), "master_pb.Heartbeat")
proto.RegisterType((*HeartbeatResponse)(nil), "master_pb.HeartbeatResponse")
@ -1486,97 +1494,98 @@ var _Seaweed_serviceDesc = grpc.ServiceDesc{
func init() { proto.RegisterFile("master.proto", fileDescriptor0) }
var fileDescriptor0 = []byte{
// 1457 bytes of a gzipped FileDescriptorProto
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}

3
weed/server/master_grpc_server_volume.go
View File

@ -135,7 +135,8 @@ func (ms *MasterServer) VolumeList(ctx context.Context, req *master_pb.VolumeLis
}
resp := &master_pb.VolumeListResponse{
TopologyInfo: ms.Topo.ToTopologyInfo(),
TopologyInfo: ms.Topo.ToTopologyInfo(),
VolumeSizeLimitMb: uint64(ms.volumeSizeLimitMB),
}
return resp, nil

211
weed/shell/command_volume_balance.go
View File

@ -0,0 +1,211 @@
package shell
import (
"context"
"flag"
"fmt"
"io"
"os"
"sort"
"time"
"github.com/chrislusf/seaweedfs/weed/pb/master_pb"
"github.com/chrislusf/seaweedfs/weed/storage/needle"
)
func init() {
commands = append(commands, &commandVolumeBalance{})
}
type commandVolumeBalance struct {
}
func (c *commandVolumeBalance) Name() string {
return "volume.balance"
}
func (c *commandVolumeBalance) Help() string {
return `balance all volumes among volume servers
volume.balance [-c collectionName] [-f]
Algorithm:
For each type of volume server (different max volume count limit){
balanceWritableVolumes()
balanceReadOnlyVolumes()
}
func balanceWritableVolumes(){
idealWritableVolumes = totalWritableVolumes / numVolumeServers
for {
sort all volume servers ordered by{
local writable volumes
}
pick the volume server A with the lowest number of writable volumes x
pick the volume server B with the highest number of writable volumes y
if y > idealWritableVolumes and x +1 < idealWritableVolumes {
if B has a writable volume id v that A does not have {
move writable volume v from A to B
}
}
}
}
func balanceReadOnlyVolumes(){
//similar to balanceWritableVolumes
}
`
}
func (c *commandVolumeBalance) Do(args []string, commandEnv *commandEnv, writer io.Writer) (err error) {
balanceCommand := flag.NewFlagSet(c.Name(), flag.ContinueOnError)
collection := balanceCommand.String("c", "", "collection name. use \"ALL\" for all collections")
applyBalancing := balanceCommand.Bool("f", false, "apply the balancing plan.")
if err = balanceCommand.Parse(args); err != nil {
return nil
}
var resp *master_pb.VolumeListResponse
ctx := context.Background()
err = commandEnv.masterClient.WithClient(ctx, func(client master_pb.SeaweedClient) error {
resp, err = client.VolumeList(ctx, &master_pb.VolumeListRequest{})
return err
})
if err != nil {
return err
}
typeToNodes := collectVolumeServersByType(resp.TopologyInfo)
for _, volumeServers := range typeToNodes {
if len(volumeServers) < 2 {
continue
}
balanceVolumeServers(commandEnv, volumeServers, resp.VolumeSizeLimitMb*1024*1024, *collection, *applyBalancing)
}
return nil
}
func balanceVolumeServers(commandEnv *commandEnv, dataNodeInfos []*master_pb.DataNodeInfo, volumeSizeLimit uint64, collection string, applyBalancing bool) {
var nodes []*Node
for _, dn := range dataNodeInfos {
nodes = append(nodes, &Node{
info: dn,
})
}
// balance writable volumes
for _, n := range nodes {
n.prepareVolumes(func(v *master_pb.VolumeInformationMessage) bool {
if collection != "ALL" {
if v.Collection != collection {
return false
}
}
return !v.ReadOnly && v.Size < volumeSizeLimit
})
}
balanceSelectedVolume(commandEnv, nodes, sortWritableVolumes, applyBalancing)
// balance readable volumes
for _, n := range nodes {
n.prepareVolumes(func(v *master_pb.VolumeInformationMessage) bool {
if collection != "ALL" {
if v.Collection != collection {
return false
}
}
return v.ReadOnly || v.Size >= volumeSizeLimit
})
}
balanceSelectedVolume(commandEnv, nodes, sortReadOnlyVolumes, applyBalancing)
}
func collectVolumeServersByType(t *master_pb.TopologyInfo) (typeToNodes map[uint64][]*master_pb.DataNodeInfo) {
typeToNodes = make(map[uint64][]*master_pb.DataNodeInfo)
for _, dc := range t.DataCenterInfos {
for _, r := range dc.RackInfos {
for _, dn := range r.DataNodeInfos {
typeToNodes[dn.MaxVolumeCount] = append(typeToNodes[dn.MaxVolumeCount], dn)
}
}
}
return
}
type Node struct {
info *master_pb.DataNodeInfo
selectedVolumes map[uint32]*master_pb.VolumeInformationMessage
}
func sortWritableVolumes(volumes []*master_pb.VolumeInformationMessage) {
sort.Slice(volumes, func(i, j int) bool {
return volumes[i].Size < volumes[j].Size
})
}
func sortReadOnlyVolumes(volumes []*master_pb.VolumeInformationMessage) {
sort.Slice(volumes, func(i, j int) bool {
return volumes[i].Id < volumes[j].Id
})
}
func balanceSelectedVolume(commandEnv *commandEnv, nodes []*Node, sortCandidatesFn func(volumes []*master_pb.VolumeInformationMessage), applyBalancing bool) {
selectedVolumeCount := 0
for _, dn := range nodes {
selectedVolumeCount += len(dn.selectedVolumes)
}
idealSelectedVolumes := selectedVolumeCount / len(nodes)
hasMove := true
for hasMove {
hasMove = false
sort.Slice(nodes, func(i, j int) bool {
return len(nodes[i].selectedVolumes) < len(nodes[j].selectedVolumes)
})
emptyNode, fullNode := nodes[0], nodes[len(nodes)-1]
if len(fullNode.selectedVolumes) > idealSelectedVolumes && len(emptyNode.selectedVolumes)+1 <= idealSelectedVolumes {
// sort the volumes to move
var candidateVolumes []*master_pb.VolumeInformationMessage
for _, v := range fullNode.selectedVolumes {
candidateVolumes = append(candidateVolumes, v)
}
sortCandidatesFn(candidateVolumes)
for _, v := range candidateVolumes {
if _, found := emptyNode.selectedVolumes[v.Id]; !found {
moveVolume(commandEnv, v, fullNode, emptyNode, applyBalancing)
delete(fullNode.selectedVolumes, v.Id)
emptyNode.selectedVolumes[v.Id] = v
hasMove = true
break
}
}
}
}
}
func moveVolume(commandEnv *commandEnv, v *master_pb.VolumeInformationMessage, fullNode *Node, emptyNode *Node, applyBalancing bool) {
collectionPrefix := v.Collection + "_"
if v.Collection == "" {
collectionPrefix = ""
}
fmt.Fprintf(os.Stdout, "moving volume %s%d %s => %s\n", collectionPrefix, v.Id, fullNode.info.Id, emptyNode.info.Id)
if applyBalancing {
ctx := context.Background()
LiveMoveVolume(ctx, commandEnv.option.GrpcDialOption, needle.VolumeId(v.Id), fullNode.info.Id, emptyNode.info.Id, 5*time.Second)
}
}
func (node *Node) prepareVolumes(fn func(v *master_pb.VolumeInformationMessage) bool) {
node.selectedVolumes = make(map[uint32]*master_pb.VolumeInformationMessage)
for _, v := range node.info.VolumeInfos {
if fn(v) {
node.selectedVolumes[v.Id] = v
}
}
}
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