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Gradually evict oldest cache entries (#1768)

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* Gradually evict oldest cache entries

* Keep the remaining 10% of cached entries
This commit is contained in:
Neil Alexander 2021-02-17 13:50:27 +00:00 committed by GitHub
parent 5d74a1757f
commit 2386e0c7af
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1 changed files with 20 additions and 0 deletions
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20
internal/caching/impl_inmemorylru.go
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@ -2,6 +2,7 @@ package caching
import (
"fmt"
"time"
lru "github.com/hashicorp/golang-lru"
"github.com/prometheus/client_golang/prometheus"
@ -72,6 +73,11 @@ func NewInMemoryLRUCache(enablePrometheus bool) (*Caches, error) {
if err != nil {
return nil, err
}
go cacheCleaner(
roomVersions, serverKeys, roomServerStateKeyNIDs,
roomServerEventTypeNIDs, roomServerRoomIDs,
roomInfos, federationEvents,
)
return &Caches{
RoomVersions: roomVersions,
ServerKeys: serverKeys,
@ -83,6 +89,20 @@ func NewInMemoryLRUCache(enablePrometheus bool) (*Caches, error) {
}, nil
}
func cacheCleaner(caches ...*InMemoryLRUCachePartition) {
for {
time.Sleep(time.Minute)
for _, cache := range caches {
// Hold onto the last 10% of the cache entries, since
// otherwise a quiet period might cause us to evict all
// cache entries entirely.
if cache.lru.Len() > cache.maxEntries/10 {
cache.lru.RemoveOldest()
}
}
}
}
type InMemoryLRUCachePartition struct {
name string
mutable bool