102 lines
3.2 KiB
Go
102 lines
3.2 KiB
Go
/*
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Copyright 2015 The Kubernetes Authors.
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Licensed under the Apache License, Version 2.0 (the "License");
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you may not use this file except in compliance with the License.
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You may obtain a copy of the License at
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http://www.apache.org/licenses/LICENSE-2.0
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Unless required by applicable law or agreed to in writing, software
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distributed under the License is distributed on an "AS IS" BASIS,
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WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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See the License for the specific language governing permissions and
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limitations under the License.
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*/
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package podschedulers
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import (
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"fmt"
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log "github.com/golang/glog"
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"github.com/mesos/mesos-go/mesosproto"
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"k8s.io/kubernetes/contrib/mesos/pkg/node"
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"k8s.io/kubernetes/contrib/mesos/pkg/offers"
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"k8s.io/kubernetes/contrib/mesos/pkg/scheduler/errors"
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"k8s.io/kubernetes/contrib/mesos/pkg/scheduler/podtask"
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"k8s.io/kubernetes/pkg/api"
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)
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type fcfsPodScheduler struct {
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procurement podtask.Procurement
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lookupNode node.LookupFunc
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}
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func NewFCFSPodScheduler(pr podtask.Procurement, lookupNode node.LookupFunc) PodScheduler {
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return &fcfsPodScheduler{pr, lookupNode}
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}
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// A first-come-first-serve scheduler: acquires the first offer that can support the task
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func (fps *fcfsPodScheduler) SchedulePod(r offers.Registry, task *podtask.T) (offers.Perishable, *podtask.Spec, error) {
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podName := fmt.Sprintf("%s/%s", task.Pod.Namespace, task.Pod.Name)
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var matchingOffer offers.Perishable
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var acceptedSpec *podtask.Spec
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err := r.Walk(func(p offers.Perishable) (bool, error) {
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offer := p.Details()
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if offer == nil {
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return false, fmt.Errorf("nil offer while scheduling task %v", task.ID)
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}
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// check that the node actually exists. As offers are declined if not, the
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// case n==nil can only happen when the node object was deleted since the
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// offer came in.
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nodeName := offer.GetHostname()
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n := fps.lookupNode(nodeName)
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if n == nil {
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log.V(3).Infof("ignoring offer for node %s because node went away", nodeName)
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return false, nil
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}
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ps := podtask.NewProcureState(offer)
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err := fps.procurement.Procure(task, n, ps)
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if err != nil {
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log.V(5).Infof(
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"Offer %q does not fit pod %s/%s: %v",
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offer.Id, task.Pod.Namespace, task.Pod.Name, err,
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)
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return false, nil // continue
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}
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if !p.Acquire() {
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log.V(2).Infof(
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"Could not acquire offer %q for pod %s/%s",
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offer.Id, task.Pod.Namespace, task.Pod.Name,
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)
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return false, nil // continue
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}
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matchingOffer = p
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acceptedSpec, _ = ps.Result()
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log.V(3).Infof("Pod %s accepted offer %v", podName, offer.Id.GetValue())
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return true, nil // stop, we found an offer
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})
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if matchingOffer != nil {
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if err != nil {
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log.Warningf("problems walking the offer registry: %v, attempting to continue", err)
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}
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return matchingOffer, acceptedSpec, nil
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}
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if err != nil {
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log.V(2).Infof("failed to find a fit for pod: %s, err = %v", podName, err)
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return nil, nil, err
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}
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log.V(2).Infof("failed to find a fit for pod: %s", podName)
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return nil, nil, errors.NoSuitableOffersErr
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}
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func (fps *fcfsPodScheduler) Fit(t *podtask.T, offer *mesosproto.Offer, n *api.Node) bool {
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return fps.procurement.Procure(t, n, podtask.NewProcureState(offer)) == nil
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}
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