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[PATCH] Fix equiv. cache invalidation of Node condition.

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Equivalence cache for CheckNodeConditionPred becomes invalid when
Node.Spec.Unschedulable changes. This can happen even if
Node.Status.Conditions does not change, so move the logic around.

This logic is covered by integration test
"test/integration/scheduler".TestUnschedulableNodes but equivalence
cache is currently skipped when test pods have no OwnerReference.

Add benchmark for equivalence hashing.

Change equivalence hash function.

This changes the equivalence class hashing function to use as inputs all
the Pod fields which are read by FitPredicates. Before we used a
combination of OwnerReference and PersistentVolumeClaim info, which was
a close approximation. The new method ensures that hashing remains
correct regardless of controller behavior.

The PVCSet field can be removed from equivalencePod because it is
implicitly included in the Volume list.

Tests are now broken.

Move equivalence class hash code.

This moves the equivalence hashing code from
algorithm/predicates/utils.go to core/equivalence_cache.go.

In the process, making the hashing function and hashing function factory
both injectable dependencies is removed.

Fix equivalence cache hash tests.

Co-authored-by: Jonathan Basseri <misterikkit@google.com>
Co-authored-by: Harry Zhang <resouer@gmail.com>
This commit is contained in:
Jonathan Basseri
2018-01-24 17:02:12 -08:00
committed by Harry Zhang
parent c6d0726df8
commit f5ab6d5ad4
8 changed files with 255 additions and 328 deletions
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7
pkg/scheduler/algorithmprovider/defaults/defaults.go
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@@ -77,13 +77,6 @@ func init() {
// Fit is determined by node selector query.
factory.RegisterFitPredicate(predicates.MatchNodeSelectorPred, predicates.PodMatchNodeSelector)
// Use equivalence class to speed up heavy predicates phase.
factory.RegisterGetEquivalencePodFunction(
func(args factory.PluginFactoryArgs) algorithm.GetEquivalencePodFunc {
return predicates.NewEquivalencePodGenerator(args.PVCInfo)
},
)
// ServiceSpreadingPriority is a priority config factory that spreads pods by minimizing
// the number of pods (belonging to the same service) on the same node.
// Register the factory so that it's available, but do not include it as part of the default priorities