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Gradually evict oldest cache entries (#1768)
* Gradually evict oldest cache entries * Keep the remaining 10% of cached entries
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parent
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@ -2,6 +2,7 @@ package caching
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import (
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"fmt"
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"time"
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lru "github.com/hashicorp/golang-lru"
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"github.com/prometheus/client_golang/prometheus"
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@ -72,6 +73,11 @@ func NewInMemoryLRUCache(enablePrometheus bool) (*Caches, error) {
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if err != nil {
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return nil, err
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}
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go cacheCleaner(
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roomVersions, serverKeys, roomServerStateKeyNIDs,
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roomServerEventTypeNIDs, roomServerRoomIDs,
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roomInfos, federationEvents,
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)
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return &Caches{
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RoomVersions: roomVersions,
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ServerKeys: serverKeys,
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@ -83,6 +89,20 @@ func NewInMemoryLRUCache(enablePrometheus bool) (*Caches, error) {
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}, nil
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}
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func cacheCleaner(caches ...*InMemoryLRUCachePartition) {
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for {
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time.Sleep(time.Minute)
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for _, cache := range caches {
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// Hold onto the last 10% of the cache entries, since
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// otherwise a quiet period might cause us to evict all
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// cache entries entirely.
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if cache.lru.Len() > cache.maxEntries/10 {
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cache.lru.RemoveOldest()
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}
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}
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}
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}
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type InMemoryLRUCachePartition struct {
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name string
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mutable bool
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