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Introduce PostFilter extension point

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This commit is contained in:
Wei Huang
2020-06-05 13:02:45 -07:00
parent b8b4186a14
commit 69b9ba6012
5 changed files with 308 additions and 1 deletions
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31
pkg/scheduler/framework/v1alpha1/interface.go
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@@ -273,6 +273,23 @@ type FilterPlugin interface {
Filter(ctx context.Context, state *CycleState, pod *v1.Pod, nodeInfo *NodeInfo) *Status
}
// PostFilterPlugin is an interface for PostFilter plugins. These plugins are called
// after a pod cannot be scheduled.
type PostFilterPlugin interface {
Plugin
// PostFilter is called by the scheduling framework.
// A PostFilter plugin should return one of the following statuses:
// - Unschedulable: the plugin gets executed successfully but the pod cannot be made schedulable.
// - Success: the plugin gets executed successfully and the pod can be made schedulable.
// - Error: the plugin aborts due to some internal error.
//
// Informational plugins should be configured ahead of other ones, and always return Unschedulable status.
// Optionally, a non-nil PostFilterResult may be returned along with a Success status. For example,
// a preemption plugin may choose to return nominatedNodeName, so that framework can reuse that to update the
// preemptor pod's .spec.status.nominatedNodeName field.
PostFilter(ctx context.Context, state *CycleState, pod *v1.Pod, filteredNodeStatusMap NodeToStatusMap) (*PostFilterResult, *Status)
}
// PreScorePlugin is an interface for Pre-score plugin. Pre-score is an
// informational extension point. Plugins will be called with a list of nodes
// that passed the filtering phase. A plugin may use this data to update internal
@@ -398,6 +415,12 @@ type Framework interface {
// schedule the target pod.
RunFilterPlugins(ctx context.Context, state *CycleState, pod *v1.Pod, nodeInfo *NodeInfo) PluginToStatus
// RunPostFilterPlugins runs the set of configured PostFilter plugins.
// PostFilter plugins can either be informational, in which case should be configured
// to execute first and return Unschedulable status, or ones that try to change the
// cluster state to make the pod potentially schedulable in a future scheduling cycle.
RunPostFilterPlugins(ctx context.Context, state *CycleState, pod *v1.Pod, filteredNodeStatusMap NodeToStatusMap) (*PostFilterResult, *Status)
// RunPreFilterExtensionAddPod calls the AddPod interface for the set of configured
// PreFilter plugins. It returns directly if any of the plugins return any
// status other than Success.
@@ -490,6 +513,14 @@ type FrameworkHandle interface {
ClientSet() clientset.Interface
SharedInformerFactory() informers.SharedInformerFactory
// TODO: unroll the wrapped interfaces to FrameworkHandle.
PreemptHandle() PreemptHandle
}
// PostFilterResult wraps needed info for scheduler framework to act upon PostFilter phase.
type PostFilterResult struct {
NominatedNodeName string
}
// PreemptHandle incorporates all needed logic to run preemption logic.