mirror of https://github.com/k3s-io/k3s
106 lines
3.1 KiB
Go
106 lines
3.1 KiB
Go
/*
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Copyright 2015 The Kubernetes Authors All rights reserved.
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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 scheduler
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import (
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"fmt"
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log "github.com/golang/glog"
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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/podtask"
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)
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type allocationStrategy struct {
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fitPredicate podtask.FitPredicate
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procurement podtask.Procurement
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}
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func (a *allocationStrategy) FitPredicate() podtask.FitPredicate {
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return a.fitPredicate
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}
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func (a *allocationStrategy) Procurement() podtask.Procurement {
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return a.procurement
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}
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func NewAllocationStrategy(fitPredicate podtask.FitPredicate, procurement podtask.Procurement) AllocationStrategy {
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if fitPredicate == nil {
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panic("fitPredicate is required")
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}
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if procurement == nil {
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panic("procurement is required")
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}
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return &allocationStrategy{
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fitPredicate: fitPredicate,
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procurement: procurement,
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}
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}
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type fcfsPodScheduler struct {
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AllocationStrategy
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lookupNode node.LookupFunc
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}
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func NewFCFSPodScheduler(as AllocationStrategy, lookupNode node.LookupFunc) PodScheduler {
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return &fcfsPodScheduler{as, 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, unused SlaveIndex, task *podtask.T) (offers.Perishable, error) {
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podName := fmt.Sprintf("%s/%s", task.Pod.Namespace, task.Pod.Name)
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var acceptedOffer offers.Perishable
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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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if fps.FitPredicate()(task, offer, n) {
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if p.Acquire() {
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acceptedOffer = p
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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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}
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return false, nil // continue
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})
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if acceptedOffer != 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 acceptedOffer, 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, 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, noSuitableOffersErr
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}
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