// Create creates a scheduler and all support functions.
func (factory *ConfigFactory) Create() *scheduler.Config {
// Watch and queue pods that need scheduling.
podQueue := cache.NewFIFO()
cache.NewReflector(factory.createUnassignedPodLW(), &api.Pod{}, podQueue).Run()
// Watch and cache all running pods. Scheduler needs to find all pods
// so it knows where it's safe to place a pod. Cache this locally.
podCache := cache.NewStore()
cache.NewReflector(factory.createAssignedPodLW(), &api.Pod{}, podCache).Run()
// Watch minions.
// Minions may be listed frequently, so provide a local up-to-date cache.
minionCache := cache.NewStore()
if false {
// Disable this code until minions support watches.
cache.NewReflector(factory.createMinionLW(), &api.Minion{}, minionCache).Run()
} else {
cache.NewPoller(factory.pollMinions, 10*time.Second, minionCache).Run()
}
r := rand.New(rand.NewSource(time.Now().UnixNano()))
minionLister := &storeToMinionLister{minionCache}
algo := algorithm.NewGenericScheduler(
[]algorithm.FitPredicate{
// Fit is defined based on the absence of port conflicts.
algorithm.PodFitsPorts,
// Fit is determined by resource availability
algorithm.NewResourceFitPredicate(minionLister),
// Fit is determined by non-conflicting disk volumes
algorithm.NoDiskConflict,
// Fit is determined by node selector query
algorithm.NewSelectorMatchPredicate(minionLister),
},
// Prioritize nodes by least requested utilization.
algorithm.LeastRequestedPriority,
&storeToPodLister{podCache}, r)
podBackoff := podBackoff{
perPodBackoff: map[string]*backoffEntry{},
clock: realClock{},
}
return &scheduler.Config{
MinionLister: minionLister,
Algorithm: algo,
Binder: &binder{factory.Client},
NextPod: func() *api.Pod {
pod := podQueue.Pop().(*api.Pod)
glog.V(2).Infof("About to try and schedule pod %v\n"+
"\tknown minions: %v\n"+
"\tknown scheduled pods: %v\n",
pod.Name, minionCache.ContainedIDs(), podCache.ContainedIDs())
return pod
},
Error: factory.makeDefaultErrorFunc(&podBackoff, podQueue),
}
}
func defaultPredicates() util.StringSet {
return util.NewStringSet(
// Fit is defined based on the absence of port conflicts.
factory.RegisterFitPredicate("PodFitsPorts", algorithm.PodFitsPorts),
// Fit is determined by resource availability.
factory.RegisterFitPredicate("PodFitsResources", algorithm.NewResourceFitPredicate(factory.MinionLister)),
// Fit is determined by non-conflicting disk volumes.
factory.RegisterFitPredicate("NoDiskConflict", algorithm.NoDiskConflict),
// Fit is determined by node selector query.
factory.RegisterFitPredicate("MatchNodeSelector", algorithm.NewSelectorMatchPredicate(factory.MinionLister)),
// Fit is determined by the presence of the Host parameter and a string match
factory.RegisterFitPredicate("HostName", algorithm.PodFitsHost),
)
}