/
leader.go
299 lines (279 loc) · 8.43 KB
/
leader.go
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// Copyright 2020 The GoSchedule Authors. All rights reserved.
// Use of this source code is governed by BSD
// license that can be found in the LICENSE file.
package core
import (
"errors"
"sync"
"time"
"github.com/jasonjoo2010/goschedule/core/worker"
"github.com/jasonjoo2010/goschedule/core/worker/task_worker"
"github.com/jasonjoo2010/goschedule/definition"
"github.com/jasonjoo2010/goschedule/log"
"github.com/jasonjoo2010/goschedule/store"
"github.com/jasonjoo2010/goschedule/types"
"github.com/jasonjoo2010/goschedule/utils"
"github.com/sirupsen/logrus"
)
func (manager *ScheduleManager) isLeader(strategyId string) bool {
list, err := manager.store.GetStrategyRuntimes(strategyId)
if err != nil || len(list) < 1 {
return false
}
arr := make([]string, len(list))
var myself *definition.StrategyRuntime
for i, runtime := range list {
arr[i] = runtime.SchedulerID
if runtime.SchedulerID == manager.scheduler.ID {
myself = runtime
}
}
now := time.Now().Unix() * 1000
if myself != nil && now-myself.CreateAt < manager.cfg.StallAfterStartup.Milliseconds() {
// schedule after stalling
return false
}
leaderUUID := utils.FetchLeader(arr)
if leaderUUID == manager.scheduler.ID {
return true
}
// double check the scheduler really exists
scheduler, _ := manager.store.GetScheduler(leaderUUID)
if scheduler == nil {
// dirty runtime
manager.cleanScheduler(leaderUUID)
}
return false
}
func (manager *ScheduleManager) cleanScheduler(schedulerId string) {
manager.store.UnregisterScheduler(schedulerId)
// clean dead runtimes binded to it
strategies, err := manager.store.GetStrategies()
if err != nil {
log.Warnf("Failed to fetch strategies: %s", err.Error())
return
}
for _, strategy := range strategies {
manager.store.RemoveStrategyRuntime(strategy.ID, schedulerId)
}
}
func (manager *ScheduleManager) clearExpiredSchedulers() {
schedulers, err := manager.store.GetSchedulers()
if err != nil {
logrus.Warnf("Get scheudlers failed: %s", err.Error())
return
}
now := time.Now().UnixNano() / 1e6
for _, scheduler := range schedulers {
if now-scheduler.LastHeartbeat > manager.cfg.DeathTimeout.Milliseconds() {
logrus.Info("Clear expired scheduler: ", scheduler.ID, ", last reach at ", scheduler.LastHeartbeat)
manager.cleanScheduler(scheduler.ID)
}
}
}
func (manager *ScheduleManager) generateRuntimes() {
strategies, err := manager.store.GetStrategies()
if err != nil {
logrus.Warn("Get strategies failed: ", err.Error())
return
}
hostname := utils.GetHostName()
ip := utils.GetHostIPv4()
for _, strategy := range strategies {
canSchedule := utils.CanSchedule(strategy.IPList, hostname, ip)
runtime, err := manager.store.GetStrategyRuntime(strategy.ID, manager.scheduler.ID)
if err != nil && err != store.NotExist {
continue
}
if manager.scheduler.Enabled && strategy.Enabled && canSchedule {
// register runtimes if lack
if runtime == nil {
runtime = &definition.StrategyRuntime{
SchedulerID: manager.scheduler.ID,
StrategyID: strategy.ID,
CreateAt: time.Now().Unix() * 1000,
}
manager.store.SetStrategyRuntime(runtime)
}
} else {
// clear runtimes if any
if runtime != nil {
logrus.Info("Clean runtime for strategy: ", runtime.StrategyID, " with scheduler ", runtime.SchedulerID)
manager.store.RemoveStrategyRuntime(strategy.ID, manager.scheduler.ID)
// stop the workers
manager.stopWorkers(strategy)
}
}
}
}
func (manager *ScheduleManager) assign() {
strategies, err := manager.store.GetStrategies()
if err != nil {
logrus.Warn("Failed to fetch strategies", err)
return
}
for _, strategy := range strategies {
if !strategy.Enabled {
continue
}
if !manager.isLeader(strategy.ID) {
continue
}
// It's the leader to specific strategy
runtimes, err := manager.store.GetStrategyRuntimes(strategy.ID)
if err != nil {
logrus.Warn("Failed to fetch runtimes for ", strategy.ID, ": ", err.Error())
continue
}
workerRequiredArr := utils.AssignWorkers(len(runtimes), strategy.Total, strategy.MaxOnSingleScheduler)
utils.SortRuntimesWithShuffle(runtimes)
for i := 0; i < len(runtimes); i++ {
if workerRequiredArr[i] != runtimes[i].RequestedNum {
runtimes[i].RequestedNum = workerRequiredArr[i]
manager.store.SetStrategyRuntime(runtimes[i])
}
}
}
}
func (manager *ScheduleManager) createWorker(strategy *definition.Strategy) (types.Worker, error) {
switch strategy.Kind {
case definition.SimpleKind:
return worker.NewSimple(*strategy)
case definition.FuncKind:
return worker.NewFunc(*strategy)
case definition.TaskKind:
task, err := manager.store.GetTask(strategy.Bind)
if err != nil {
return nil, err
}
return task_worker.NewTask(*strategy, *task, manager.store, manager.scheduler.ID)
default:
logrus.Error("Unknow Kind of strategy: ", strategy.Kind)
return nil, errors.New("Unknow strategy kind")
}
}
func (manager *ScheduleManager) maintainWorkers(strategy *definition.Strategy, target int) {
workersCnt := manager.workerSet.WorkersCountFor(strategy.ID)
delta := target - workersCnt
if delta > 0 {
// increase
log.Infof("Increase worker by %d for %s on %s", delta, strategy.ID, manager.scheduler.ID)
for i := 0; i < delta; i++ {
w, err := manager.createWorker(strategy)
if err != nil {
logrus.Error("Can't create worker for: ", strategy.ID)
continue
}
go func() {
err := w.Start(strategy.ID, strategy.Parameter)
if err != nil {
log.Errorf("Failed to start a worker: %+v", err.Error())
}
}()
logrus.Info("Worker of strategy ", strategy.ID, " started")
manager.workerSet.AddWorker(strategy.ID, w)
}
} else if delta < 0 {
// decrease
logrus.Info("Decrease worker by ", -delta, " for ", strategy.ID, " on ", manager.scheduler.ID)
for i := 0; i < -delta; i++ {
if w := manager.workerSet.RemoveWorker(strategy.ID); w != nil {
go func() {
err := w.Stop(strategy.ID, strategy.Parameter)
if err != nil {
log.Errorf("Failed to stop a worker: %+v", err.Error())
}
}()
}
}
}
}
func (manager *ScheduleManager) adjustWorkers() {
strategies, err := manager.store.GetStrategies()
if err != nil {
logrus.Warn("Failed to fetch strategies ", err)
return
}
for _, strategy := range strategies {
if !strategy.Enabled {
continue
}
runtime, err := manager.store.GetStrategyRuntime(strategy.ID, manager.scheduler.ID)
if err == store.NotExist {
continue
}
if err != nil {
logrus.Warn("Failed to fetch runtime for ", strategy.ID, ": ", err.Error())
continue
}
if runtime.RequestedNum < 0 {
logrus.Error("Requested count of workers in runtime is set to a wrong number: ", runtime.RequestedNum, " for ", strategy.ID)
runtime.RequestedNum = 0
}
workersCnt := manager.workerSet.WorkersCountFor(runtime.StrategyID)
if workersCnt != runtime.RequestedNum {
manager.maintainWorkers(strategy, runtime.RequestedNum)
workersCnt = manager.workerSet.WorkersCountFor(runtime.StrategyID)
}
// update info in storage
if runtime.Num != workersCnt {
runtime.Num = workersCnt
manager.store.SetStrategyRuntime(runtime)
}
}
}
func (manager *ScheduleManager) schedule() {
manager.clearExpiredSchedulers()
manager.generateRuntimes()
// calculate schedule table
manager.assign()
// adjust local workers
manager.adjustWorkers()
}
// stopWorkers stop group of workers binded to specific strategy
func (manager *ScheduleManager) stopWorkers(strategy *definition.Strategy) error {
defer manager.workerSet.Delete(strategy.ID)
workers := manager.workerSet.WorkersFor(strategy.ID)
if len(workers) == 0 {
return nil
}
wg := sync.WaitGroup{}
for _, w := range workers {
wg.Add(1)
go func(w types.Worker) {
defer wg.Done()
defer func() {
if err := recover(); err != nil {
log.Errorf("Stop worker %s failed: %v", strategy.ID, err)
traceData := utils.StackTraceData()
defer traceData.Recycle()
log.Error("Trace: ", traceData.String())
}
}()
w.Stop(strategy.ID, strategy.Parameter)
}(w)
}
wg.Wait()
return nil
}
func (manager *ScheduleManager) stopAllWorkers() {
wg := sync.WaitGroup{}
names := manager.workerSet.Strategies()
for _, name := range names {
strategy, _ := manager.store.GetStrategy(name)
if strategy == nil {
logrus.Warn("Strategy not found: ", name)
strategy = &definition.Strategy{
ID: name,
Parameter: "",
}
}
wg.Add(1)
go func(s *definition.Strategy) {
defer wg.Done()
manager.stopWorkers(s)
}(strategy)
}
// wait
wg.Wait()
}