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critical pods can preempt other pods to be admitted

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This commit is contained in:
David Ashpole
2017-02-23 10:31:20 -08:00
parent 2e12711160
commit c58970e47c
15 changed files with 1071 additions and 9 deletions
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28
pkg/kubelet/lifecycle/predicate.go
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@@ -22,20 +22,30 @@ import (
"github.com/golang/glog"
"k8s.io/kubernetes/pkg/api/v1"
"k8s.io/kubernetes/pkg/kubelet/util/format"
"k8s.io/kubernetes/plugin/pkg/scheduler/algorithm"
"k8s.io/kubernetes/plugin/pkg/scheduler/algorithm/predicates"
"k8s.io/kubernetes/plugin/pkg/scheduler/schedulercache"
)
type getNodeAnyWayFuncType func() (*v1.Node, error)
// AdmissionFailureHandler is an interface which defines how to deal with a failure to admit a pod.
// This allows for the graceful handling of pod admission failure.
type AdmissionFailureHandler interface {
HandleAdmissionFailure(pod *v1.Pod, failureReasons []algorithm.PredicateFailureReason) (bool, []algorithm.PredicateFailureReason, error)
}
type predicateAdmitHandler struct {
getNodeAnyWayFunc getNodeAnyWayFuncType
getNodeAnyWayFunc getNodeAnyWayFuncType
admissionFailureHandler AdmissionFailureHandler
}
var _ PodAdmitHandler = &predicateAdmitHandler{}
func NewPredicateAdmitHandler(getNodeAnyWayFunc getNodeAnyWayFuncType) *predicateAdmitHandler {
func NewPredicateAdmitHandler(getNodeAnyWayFunc getNodeAnyWayFuncType, admissionFailureHandler AdmissionFailureHandler) *predicateAdmitHandler {
return &predicateAdmitHandler{
getNodeAnyWayFunc,
admissionFailureHandler,
}
}
@@ -59,10 +69,22 @@ func (w *predicateAdmitHandler) Admit(attrs *PodAdmitAttributes) PodAdmitResult
glog.Warningf("Failed to admit pod %v - %s", format.Pod(pod), message)
return PodAdmitResult{
Admit: fit,
Reason: "UnexpectedError",
Reason: "UnexpectedAdmissionError",
Message: message,
}
}
if !fit {
fit, reasons, err = w.admissionFailureHandler.HandleAdmissionFailure(pod, reasons)
if err != nil {
message := fmt.Sprintf("Unexpected error while attempting to recover from admission failure: %v", err)
glog.Warningf("Failed to admit pod %v - %s", format.Pod(pod), message)
return PodAdmitResult{
Admit: fit,
Reason: "UnexpectedAdmissionError",
Message: message,
}
}
}
if !fit {
var reason string
var message string