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scheduler.go
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scheduler.go
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/*
Copyright 2015 The Kubernetes 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 components
import (
"net/http"
"sync"
clientset "k8s.io/kubernetes/pkg/client/clientset_generated/internalclientset"
mesos "github.com/mesos/mesos-go/mesosproto"
"k8s.io/kubernetes/contrib/mesos/pkg/backoff"
"k8s.io/kubernetes/contrib/mesos/pkg/offers"
"k8s.io/kubernetes/contrib/mesos/pkg/queue"
"k8s.io/kubernetes/contrib/mesos/pkg/runtime"
"k8s.io/kubernetes/contrib/mesos/pkg/scheduler"
"k8s.io/kubernetes/contrib/mesos/pkg/scheduler/components/algorithm"
"k8s.io/kubernetes/contrib/mesos/pkg/scheduler/components/algorithm/podschedulers"
"k8s.io/kubernetes/contrib/mesos/pkg/scheduler/components/binder"
"k8s.io/kubernetes/contrib/mesos/pkg/scheduler/components/controller"
"k8s.io/kubernetes/contrib/mesos/pkg/scheduler/components/deleter"
"k8s.io/kubernetes/contrib/mesos/pkg/scheduler/components/errorhandler"
"k8s.io/kubernetes/contrib/mesos/pkg/scheduler/components/framework"
"k8s.io/kubernetes/contrib/mesos/pkg/scheduler/components/podreconciler"
"k8s.io/kubernetes/contrib/mesos/pkg/scheduler/config"
"k8s.io/kubernetes/contrib/mesos/pkg/scheduler/podtask"
"k8s.io/kubernetes/contrib/mesos/pkg/scheduler/queuer"
"k8s.io/kubernetes/contrib/mesos/pkg/scheduler/resources"
"k8s.io/kubernetes/pkg/api"
"k8s.io/kubernetes/pkg/client/cache"
"k8s.io/kubernetes/pkg/client/record"
)
// sched implements the Scheduler interface.
type sched struct {
podReconciler podreconciler.PodReconciler
framework framework.Framework
controller controller.Controller
// unsafe state, needs to be guarded, especially changes to podtask.T objects
sync.RWMutex
taskRegistry podtask.Registry
}
func New(
c *config.Config,
fw framework.Framework,
ps podschedulers.PodScheduler,
client *clientset.Clientset,
recorder record.EventRecorder,
terminate <-chan struct{},
mux *http.ServeMux,
lw *cache.ListWatch,
taskConfig podtask.Config,
defaultCpus resources.CPUShares,
defaultMem resources.MegaBytes,
) scheduler.Scheduler {
core := &sched{
framework: fw,
taskRegistry: podtask.NewInMemoryRegistry(),
}
// Watch and queue pods that need scheduling.
podUpdatesBypass := make(chan queue.Entry, c.UpdatesBacklog)
podUpdates := &podStoreAdapter{queue.NewHistorical(podUpdatesBypass)}
reflector := cache.NewReflector(lw, &api.Pod{}, podUpdates, 0)
q := queuer.New(queue.NewDelayFIFO(), podUpdates)
algorithm := algorithm.New(core, podUpdates, ps, taskConfig, defaultCpus, defaultMem)
podDeleter := deleter.New(core, q)
core.podReconciler = podreconciler.New(core, client, q, podDeleter)
bo := backoff.New(c.InitialPodBackoff.Duration, c.MaxPodBackoff.Duration)
newBC := func(podKey string) queue.BreakChan {
return queue.BreakChan(core.Offers().Listen(podKey, func(offer *mesos.Offer) bool {
core.Lock()
defer core.Unlock()
switch task, state := core.Tasks().ForPod(podKey); state {
case podtask.StatePending:
// Assess fitness of pod with the current offer. The scheduler normally
// "backs off" when it can't find an offer that matches up with a pod.
// The backoff period for a pod can terminate sooner if an offer becomes
// available that matches up.
// TODO(jdef) this will never match for a pod that uses a node selector,
// since we're passing a nil *api.Node here.
return !task.Has(podtask.Launched) && ps.Fit(task, offer, nil)
default:
// no point in continuing to check for matching offers
return true
}
}))
}
errorHandler := errorhandler.New(core, bo, q, newBC)
binder := binder.New(core)
startLatch := make(chan struct{})
runtime.On(startLatch, func() {
reflector.Run() // TODO(jdef) should listen for termination
podDeleter.Run(podUpdatesBypass, terminate)
q.Run(terminate)
q.InstallDebugHandlers(mux)
podtask.InstallDebugHandlers(core.Tasks(), mux)
})
core.controller = controller.New(client, algorithm, recorder, q.Yield, errorHandler.Error, binder, startLatch)
return core
}
func (c *sched) Run(done <-chan struct{}) {
c.controller.Run(done)
}
func (c *sched) Reconcile(t *podtask.T) {
c.podReconciler.Reconcile(t)
}
func (c *sched) Tasks() podtask.Registry {
return c.taskRegistry
}
func (c *sched) Offers() offers.Registry {
return c.framework.Offers()
}
func (c *sched) KillTask(id string) error {
return c.framework.KillTask(id)
}
func (c *sched) LaunchTask(t *podtask.T) error {
return c.framework.LaunchTask(t)
}