// returns a Process instance that will only execute a proc.Action if the scheduler is the elected master
func (self *SchedulerProcess) Master() proc.Process {
return &masterProcess{
SchedulerProcess: self,
doer: proc.DoWith(self, proc.DoerFunc(func(a proc.Action) <-chan error {
return proc.ErrorChan(masterStage.When(self, a))
})),
}
}
// New creates a new KubernetesScheduler
func New(config Config) *KubernetesScheduler {
var k *KubernetesScheduler
k = &KubernetesScheduler{
schedcfg: &config.Schedcfg,
RWMutex: new(sync.RWMutex),
executor: config.Executor,
executorGroup: uid.Parse(config.Executor.ExecutorId.GetValue()).Group(),
PodScheduler: config.Scheduler,
client: config.Client,
etcdClient: config.EtcdClient,
failoverTimeout: config.FailoverTimeout,
reconcileInterval: config.ReconcileInterval,
offers: offers.CreateRegistry(offers.RegistryConfig{
Compat: func(o *mesos.Offer) bool {
// filter the offers: the executor IDs must not identify a kubelet-
// executor with a group that doesn't match ours
for _, eid := range o.GetExecutorIds() {
execuid := uid.Parse(eid.GetValue())
if execuid.Name() == execcfg.DefaultInfoID && execuid.Group() != k.executorGroup {
return false
}
}
return true
},
DeclineOffer: func(id string) <-chan error {
errOnce := proc.NewErrorOnce(k.terminate)
errOuter := k.asRegisteredMaster.Do(func() {
var err error
defer errOnce.Report(err)
offerId := mutil.NewOfferID(id)
filters := &mesos.Filters{}
_, err = k.driver.DeclineOffer(offerId, filters)
})
return errOnce.Send(errOuter).Err()
},
// remember expired offers so that we can tell if a previously scheduler offer relies on one
LingerTTL: config.Schedcfg.OfferLingerTTL.Duration,
TTL: config.Schedcfg.OfferTTL.Duration,
ListenerDelay: config.Schedcfg.ListenerDelay.Duration,
}),
slaveHostNames: slave.NewRegistry(),
taskRegistry: podtask.NewInMemoryRegistry(),
reconcileCooldown: config.ReconcileCooldown,
registration: make(chan struct{}),
asRegisteredMaster: proc.DoerFunc(func(proc.Action) <-chan error {
return proc.ErrorChanf("cannot execute action with unregistered scheduler")
}),
}
return k
}
func (k *KubernetesScheduler) Init(electedMaster proc.Process, pl PluginInterface, mux *http.ServeMux) error {
log.V(1).Infoln("initializing kubernetes mesos scheduler")
k.asRegisteredMaster = proc.DoerFunc(func(a proc.Action) <-chan error {
if !k.registered {
return proc.ErrorChanf("failed to execute action, scheduler is disconnected")
}
return electedMaster.Do(a)
})
k.terminate = electedMaster.Done()
k.plugin = pl
k.offers.Init(k.terminate)
k.InstallDebugHandlers(mux)
return k.recoverTasks()
}