105 lines
3.3 KiB
Go
105 lines
3.3 KiB
Go
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/*
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Copyright 2016 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 kubelet
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import (
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"fmt"
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"sync"
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"github.com/golang/groupcache/lru"
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"k8s.io/apimachinery/pkg/types"
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kubecontainer "k8s.io/kubernetes/pkg/kubelet/container"
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)
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// ReasonCache stores the failure reason of the latest container start
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// in a string, keyed by <pod_UID>_<container_name>. The goal is to
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// propagate this reason to the container status. This endeavor is
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// "best-effort" for two reasons:
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// 1. The cache is not persisted.
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// 2. We use an LRU cache to avoid extra garbage collection work. This
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// means that some entries may be recycled before a pod has been
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// deleted.
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// TODO(random-liu): Use more reliable cache which could collect garbage of failed pod.
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// TODO(random-liu): Move reason cache to somewhere better.
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type ReasonCache struct {
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lock sync.Mutex
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cache *lru.Cache
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}
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// reasonInfo is the cached item in ReasonCache
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type reasonInfo struct {
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reason error
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message string
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}
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// maxReasonCacheEntries is the cache entry number in lru cache. 1000 is a proper number
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// for our 100 pods per node target. If we support more pods per node in the future, we
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// may want to increase the number.
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const maxReasonCacheEntries = 1000
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func NewReasonCache() *ReasonCache {
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return &ReasonCache{cache: lru.New(maxReasonCacheEntries)}
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}
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func (c *ReasonCache) composeKey(uid types.UID, name string) string {
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return fmt.Sprintf("%s_%s", uid, name)
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}
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// add adds error reason into the cache
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func (c *ReasonCache) add(uid types.UID, name string, reason error, message string) {
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c.lock.Lock()
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defer c.lock.Unlock()
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c.cache.Add(c.composeKey(uid, name), reasonInfo{reason, message})
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}
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// Update updates the reason cache with the SyncPodResult. Only SyncResult with
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// StartContainer action will change the cache.
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func (c *ReasonCache) Update(uid types.UID, result kubecontainer.PodSyncResult) {
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for _, r := range result.SyncResults {
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if r.Action != kubecontainer.StartContainer {
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continue
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}
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name := r.Target.(string)
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if r.Error != nil {
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c.add(uid, name, r.Error, r.Message)
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} else {
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c.Remove(uid, name)
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}
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}
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}
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// Remove removes error reason from the cache
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func (c *ReasonCache) Remove(uid types.UID, name string) {
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c.lock.Lock()
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defer c.lock.Unlock()
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c.cache.Remove(c.composeKey(uid, name))
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}
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// Get gets error reason from the cache. The return values are error reason, error message and
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// whether an error reason is found in the cache. If no error reason is found, empty string will
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// be returned for error reason and error message.
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func (c *ReasonCache) Get(uid types.UID, name string) (error, string, bool) {
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c.lock.Lock()
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defer c.lock.Unlock()
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value, ok := c.cache.Get(c.composeKey(uid, name))
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if !ok {
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return nil, "", ok
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}
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info := value.(reasonInfo)
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return info.reason, info.message, ok
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}
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