/
balancer.go
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/
balancer.go
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// Copyright 2022 The CubeFS Authors.
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or
// implied. See the License for the specific language governing
// permissions and limitations under the License.
package scheduler
import (
"context"
"errors"
"net/http"
"sort"
"time"
"github.com/cubefs/cubefs/blobstore/common/proto"
"github.com/cubefs/cubefs/blobstore/common/recordlog"
"github.com/cubefs/cubefs/blobstore/common/rpc"
"github.com/cubefs/cubefs/blobstore/common/taskswitch"
"github.com/cubefs/cubefs/blobstore/common/trace"
"github.com/cubefs/cubefs/blobstore/scheduler/base"
"github.com/cubefs/cubefs/blobstore/scheduler/client"
"github.com/cubefs/cubefs/blobstore/util/log"
)
const (
collectBalanceTaskPauseS = 5
)
var (
// ErrNoBalanceVunit no balance volume unit on disk
ErrNoBalanceVunit = errors.New("no balance volume unit on disk")
// ErrTooManyBalancingTasks too many balancing tasks
ErrTooManyBalancingTasks = errors.New("too many balancing tasks")
)
// BalanceMgrConfig balance task manager config
type BalanceMgrConfig struct {
MaxDiskFreeChunkCnt int64 `json:"max_disk_free_chunk_cnt"`
MinDiskFreeChunkCnt int64 `json:"min_disk_free_chunk_cnt"`
MigrateConfig
}
// BalanceMgr balance manager
type BalanceMgr struct {
IMigrator
clusterTopology IClusterTopology
clusterMgrCli client.ClusterMgrAPI
cfg *BalanceMgrConfig
}
// NewBalanceMgr returns balance manager
func NewBalanceMgr(clusterMgrCli client.ClusterMgrAPI, volumeUpdater client.IVolumeUpdater, taskSwitch taskswitch.ISwitcher,
clusterTopology IClusterTopology, taskLogger recordlog.Encoder, conf *BalanceMgrConfig) *BalanceMgr {
mgr := &BalanceMgr{
clusterTopology: clusterTopology,
clusterMgrCli: clusterMgrCli,
cfg: conf,
}
mgr.IMigrator = NewMigrateMgr(clusterMgrCli, volumeUpdater, taskSwitch, taskLogger,
&conf.MigrateConfig, proto.TaskTypeBalance)
mgr.IMigrator.SetLockFailHandleFunc(mgr.IMigrator.FinishTaskInAdvanceWhenLockFail)
return mgr
}
// Run run balance task manager
func (mgr *BalanceMgr) Run() {
go mgr.collectTaskLoop()
mgr.IMigrator.Run()
go mgr.checkAndClearJunkTasksLoop()
}
// Close close balance task manager
func (mgr *BalanceMgr) Close() {
mgr.clusterTopology.Close()
mgr.IMigrator.Close()
}
func (mgr *BalanceMgr) collectTaskLoop() {
t := time.NewTicker(time.Duration(mgr.cfg.CollectTaskIntervalS) * time.Second)
defer t.Stop()
for {
select {
case <-t.C:
mgr.IMigrator.WaitEnable()
err := mgr.collectionTask()
if err == ErrTooManyBalancingTasks || err == ErrNoBalanceVunit {
log.Debugf("no task to collect and sleep: sleep second[%d], err[%+v]", collectBalanceTaskPauseS, err)
time.Sleep(time.Duration(collectBalanceTaskPauseS) * time.Second)
}
case <-mgr.IMigrator.Done():
return
}
}
}
func (mgr *BalanceMgr) collectionTask() (err error) {
span, ctx := trace.StartSpanFromContext(context.Background(), "balance_collectionTask")
defer span.Finish()
needBalanceDiskCnt := mgr.cfg.DiskConcurrency - mgr.IMigrator.GetMigratingDiskNum()
if needBalanceDiskCnt <= 0 {
span.Warnf("the number of balancing disk is greater than config: current[%d], conf[%d]",
mgr.IMigrator.GetMigratingDiskNum(), mgr.cfg.DiskConcurrency)
return ErrTooManyBalancingTasks
}
// select balance disks
disks := mgr.selectDisks(mgr.cfg.MaxDiskFreeChunkCnt, mgr.cfg.MinDiskFreeChunkCnt)
span.Debugf("select balance disks: len[%d]", len(disks))
balanceDiskCnt := 0
for _, disk := range disks {
err = mgr.genOneBalanceTask(ctx, disk)
if err != nil {
continue
}
balanceDiskCnt++
if balanceDiskCnt >= needBalanceDiskCnt {
break
}
}
// if balanceDiskCnt==0, means there is no balance volume unit on disk and need to do collect task later
if balanceDiskCnt == 0 {
span.Infof("select disks has no balance volume unit on disk: len[%d]", len(disks))
return ErrNoBalanceVunit
}
return nil
}
func (mgr *BalanceMgr) selectDisks(maxFreeChunkCnt, minFreeChunkCnt int64) []*client.DiskInfoSimple {
var allDisks []*client.DiskInfoSimple
for idcName := range mgr.clusterTopology.GetIDCs() {
maxFreeChunksDisk := mgr.clusterTopology.MaxFreeChunksDisk(idcName)
if maxFreeChunksDisk != nil && maxFreeChunksDisk.FreeChunkCnt >= maxFreeChunkCnt {
allDisks = append(allDisks, mgr.clusterTopology.GetIDCDisks(idcName)...)
}
}
sortDiskByFreeChunkCnt(allDisks)
var selected []*client.DiskInfoSimple
for _, disk := range allDisks {
if !disk.IsHealth() {
continue
}
if ok := mgr.IMigrator.IsMigratingDisk(disk.DiskID); ok {
continue
}
if disk.FreeChunkCnt < minFreeChunkCnt {
selected = append(selected, disk)
}
}
return selected
}
func (mgr *BalanceMgr) genOneBalanceTask(ctx context.Context, diskInfo *client.DiskInfoSimple) (err error) {
span := trace.SpanFromContextSafe(ctx)
vuid, err := mgr.selectBalanceVunit(ctx, diskInfo.DiskID)
if err != nil {
span.Errorf("generate task source failed: disk_id[%d], err[%+v]", diskInfo.DiskID, err)
return
}
span.Debugf("select balance volume unit; vuid[%d], volume_id[%v]", vuid, vuid.Vid())
task := &proto.MigrateTask{
TaskID: client.GenMigrateTaskID(proto.TaskTypeBalance, diskInfo.DiskID, vuid.Vid()),
TaskType: proto.TaskTypeBalance,
State: proto.MigrateStateInited,
SourceIDC: diskInfo.Idc,
SourceDiskID: diskInfo.DiskID,
SourceVuid: vuid,
}
mgr.IMigrator.AddTask(ctx, task)
return
}
func (mgr *BalanceMgr) selectBalanceVunit(ctx context.Context, diskID proto.DiskID) (vuid proto.Vuid, err error) {
span := trace.SpanFromContextSafe(ctx)
vunits, err := mgr.clusterMgrCli.ListDiskVolumeUnits(ctx, diskID)
if err != nil {
return
}
sort.Slice(vunits, func(i, j int) bool {
return vunits[i].Used < vunits[j].Used
})
for i := range vunits {
volInfo, err := mgr.clusterMgrCli.GetVolumeInfo(ctx, vunits[i].Vuid.Vid())
if err != nil {
span.Errorf("get volume info failed: vid[%d], err[%+v]", vunits[i].Vuid.Vid(), err)
continue
}
if volInfo.IsIdle() {
return vunits[i].Vuid, nil
}
}
return vuid, ErrNoBalanceVunit
}
// checkAndClearJunkTasksLoop due to network timeout, it may still have some junk migrate tasks in clustermgr,
// and we need to clear those tasks later
func (mgr *BalanceMgr) checkAndClearJunkTasksLoop() {
t := time.NewTicker(clearJunkMigrationTaskInterval)
defer t.Stop()
for {
select {
case <-t.C:
mgr.checkAndClearJunkTasks()
case <-mgr.IMigrator.Done():
return
}
}
}
func (mgr *BalanceMgr) checkAndClearJunkTasks() {
span, ctx := trace.StartSpanFromContext(context.Background(), "balance.clearJunkTasks")
for _, task := range mgr.DeletedTasks() {
if time.Since(task.DeletedTime) < junkMigrationTaskProtectionWindow {
continue
}
_, err := mgr.clusterMgrCli.GetMigrateTask(ctx, proto.TaskTypeBalance, task.TaskID)
if err != nil {
if rpc.DetectStatusCode(err) != http.StatusNotFound {
span.Errorf("get balance task from clustermanager failed: err[%+v]", err)
continue
}
// means there is no junk task and only delete task from memory
} else { // delete junk task when exists
span.Warnf("delete junk task: task_id[%s]", task.TaskID)
base.InsistOn(ctx, "delete junk task", func() error {
return mgr.clusterMgrCli.DeleteMigrateTask(ctx, task.TaskID)
})
}
mgr.ClearDeletedTaskByID(task.DiskID, task.TaskID)
}
}