Since the filter status is missed for the phase of preemption, there
will be no way to tell why the preemption failed for some reasons, and
those reasons could be different with the status from the main scheduling
process (the first failed plugin will hide other failures in the chain).
This change provides verbose information based on the node status generated
during pod preemption, those information helps us to diagnose the issue which
is happened during pod preemption.
Signed-off-by: Dave Chen <dave.chen@arm.com>
The implementation consists of
- identifying all places where VolumeSource.PersistentVolumeClaim has
a special meaning and then ensuring that the same code path is taken
for an ephemeral volume, with the ownership check
- adding a controller that produces the PVCs for each embedded
VolumeSource.EphemeralVolume
- relaxing the PVC protection controller such that it removes
the finalizer already before the pod is deleted (only
if the GenericEphemeralVolume feature is enabled): this is
needed to break a cycle where foreground deletion of the pod
blocks on removing the PVC, which waits for deletion of the pod
The controller was derived from the endpointslices controller.
Refactor genericScheduler and signature of preemption funcs
- remove podNominator from genericScheduler
- simplify signature of preemption functions
Make Preempt() private
- Add a defaultpreemption PostFilter plugin
- Make g.Preempt() stateless
- make g.Preempt() stateless
- make g.getLowerPriorityNominatedPods() stateless
- make g.processPreemptionWithExtenders() stateless
- replace error with NodeToStatusMap in Preempt() signature
- eliminate podPreemptor interface and expose its functions statelessly
- move logic in scheduler.go#preempt to generic_scheduler.go#Preempt()
- Make some private functions stateless
- make addNominatedPods() not dependent on genericScheduler
- make addNominatedPods() not dependent on genericScheduler
- make selectVictimsOnNode() not dependent on genericScheduler
- make selectNodesForPreemption() not dependent on genericScheduler
