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29e92367db
When rapidly processing informer events it can happen that a pod gets scheduled twice (seen only in the TestEviction/update unit test): - Claim update observed, pod from informer cache with NodeName from update -> queue pod for eviction. - Pod update observed, claim from informer cache -> queue pod again. The effect is one additional Get call to the apiserver. We can avoid it by maintaining an LRU cache with the UIDs of the pods which we have evicted and thus don't need to do anything for.
46 lines
1.1 KiB
Go
46 lines
1.1 KiB
Go
/*
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Copyright 2022 The Kubernetes Authors.
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Licensed under the Apache License, Version 2.0 (the "License");
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you may not use this file except in compliance with the License.
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You may obtain a copy of the License at
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http://www.apache.org/licenses/LICENSE-2.0
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Unless required by applicable law or agreed to in writing, software
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distributed under the License is distributed on an "AS IS" BASIS,
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WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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See the License for the specific language governing permissions and
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limitations under the License.
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*/
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package devicetainteviction
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import (
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"k8s.io/utils/lru"
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"k8s.io/apimachinery/pkg/types"
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)
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// uidCache is an LRU cache for uid.
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type uidCache struct {
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cache *lru.Cache
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}
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// newUIDCache returns a uidCache.
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func newUIDCache(maxCacheEntries int) *uidCache {
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return &uidCache{
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cache: lru.New(maxCacheEntries),
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}
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}
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// add adds a uid to the cache.
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func (c *uidCache) add(uid types.UID) {
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c.cache.Add(uid, nil)
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}
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// has returns if a uid is in the cache.
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func (c *uidCache) has(uid types.UID) bool {
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_, found := c.cache.Get(uid)
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return found
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}
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