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fix(backend): memory leak in memory caches (#14363) 

* encapsulate `MemoryKVCache<T>`

* remove infinity caches

* encapsulate other caches

* add missing awaits to internally synchronize caches

* implement pull-through caching

* tune cache lifetimes

* optimize cache GC by stopping early

* summarize changes in CHANGELOG.md

* Fix timeout comments

Co-authored-by: かっこかり <67428053+kakkokari-gtyih@users.noreply.github.com>

* add comments about awaiting the redis write

---------

Co-authored-by: かっこかり <67428053+kakkokari-gtyih@users.noreply.github.com>
This commit is contained in:
Hazel K 2024-08-18 00:34:01 -04:00 committed by GitHub
parent 3cd5f86510
commit 9ce44b24b8
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GPG Key ID: B5690EEEBB952194
12 changed files with 101 additions and 84 deletions
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2
CHANGELOG.md
View File

@ -33,6 +33,8 @@
- Fix: 無制限にストリーミングのチャンネルに接続できる問題を修正
- Fix: ベースロールのポリシーを変更した際にモデログに記録されないのを修正
(Cherry-picked from https://github.com/MisskeyIO/misskey/pull/700)
- Fix: Prevent memory leak from memory caches (#14310)
- Fix: More reliable memory cache eviction (#14311)
## 2024.7.0

2
packages/backend/src/core/AvatarDecorationService.ts
View File

@ -29,7 +29,7 @@ export class AvatarDecorationService implements OnApplicationShutdown {
private moderationLogService: ModerationLogService,
private globalEventService: GlobalEventService,
) {
this.cache = new MemorySingleCache<MiAvatarDecoration[]>(1000 * 60 * 30);
this.cache = new MemorySingleCache<MiAvatarDecoration[]>(1000 * 60 * 30); // 30s
this.redisForSub.on('message', this.onMessage);
}

12
packages/backend/src/core/CacheService.ts
View File

@ -56,10 +56,10 @@ export class CacheService implements OnApplicationShutdown {
) {
//this.onMessage = this.onMessage.bind(this);
this.userByIdCache = new MemoryKVCache<MiUser>(Infinity);
this.localUserByNativeTokenCache = new MemoryKVCache<MiLocalUser | null>(Infinity);
this.localUserByIdCache = new MemoryKVCache<MiLocalUser>(Infinity);
this.uriPersonCache = new MemoryKVCache<MiUser | null>(Infinity);
this.userByIdCache = new MemoryKVCache<MiUser>(1000 * 60 * 5); // 5m
this.localUserByNativeTokenCache = new MemoryKVCache<MiLocalUser | null>(1000 * 60 * 5); // 5m
this.localUserByIdCache = new MemoryKVCache<MiLocalUser>(1000 * 60 * 5); // 5m
this.uriPersonCache = new MemoryKVCache<MiUser | null>(1000 * 60 * 5); // 5m
this.userProfileCache = new RedisKVCache<MiUserProfile>(this.redisClient, 'userProfile', {
lifetime: 1000 * 60 * 30, // 30m
@ -135,14 +135,14 @@ export class CacheService implements OnApplicationShutdown {
if (user == null) {
this.userByIdCache.delete(body.id);
this.localUserByIdCache.delete(body.id);
for (const [k, v] of this.uriPersonCache.cache.entries()) {
for (const [k, v] of this.uriPersonCache.entries) {
if (v.value?.id === body.id) {
this.uriPersonCache.delete(k);
}
}
} else {
this.userByIdCache.set(user.id, user);
for (const [k, v] of this.uriPersonCache.cache.entries()) {
for (const [k, v] of this.uriPersonCache.entries) {
if (v.value?.id === user.id) {
this.uriPersonCache.set(k, user);
}

12
packages/backend/src/core/CustomEmojiService.ts
View File

@ -24,7 +24,7 @@ const parseEmojiStrRegexp = /^([-\w]+)(?:@([\w.-]+))?$/;
@Injectable()
export class CustomEmojiService implements OnApplicationShutdown {
private cache: MemoryKVCache<MiEmoji | null>;
private emojisCache: MemoryKVCache<MiEmoji | null>;
public localEmojisCache: RedisSingleCache<Map<string, MiEmoji>>;
constructor(
@ -40,7 +40,7 @@ export class CustomEmojiService implements OnApplicationShutdown {
private moderationLogService: ModerationLogService,
private globalEventService: GlobalEventService,
) {
this.cache = new MemoryKVCache<MiEmoji | null>(1000 * 60 * 60 * 12);
this.emojisCache = new MemoryKVCache<MiEmoji | null>(1000 * 60 * 60 * 12); // 12h
this.localEmojisCache = new RedisSingleCache<Map<string, MiEmoji>>(this.redisClient, 'localEmojis', {
lifetime: 1000 * 60 * 30, // 30m
@ -334,7 +334,7 @@ export class CustomEmojiService implements OnApplicationShutdown {
host,
})) ?? null;
const emoji = await this.cache.fetch(`${name} ${host}`, queryOrNull);
const emoji = await this.emojisCache.fetch(`${name} ${host}`, queryOrNull);
if (emoji == null) return null;
return emoji.publicUrl || emoji.originalUrl; // || emoji.originalUrl してるのは後方互換性のため（publicUrlはstringなので??はだめ）
@ -361,7 +361,7 @@ export class CustomEmojiService implements OnApplicationShutdown {
*/
@bindThis
public async prefetchEmojis(emojis: { name: string; host: string | null; }[]): Promise<void> {
const notCachedEmojis = emojis.filter(emoji => this.cache.get(`${emoji.name} ${emoji.host}`) == null);
const notCachedEmojis = emojis.filter(emoji => this.emojisCache.get(`${emoji.name} ${emoji.host}`) == null);
const emojisQuery: any[] = [];
const hosts = new Set(notCachedEmojis.map(e => e.host));
for (const host of hosts) {
@ -376,7 +376,7 @@ export class CustomEmojiService implements OnApplicationShutdown {
select: ['name', 'host', 'originalUrl', 'publicUrl'],
}) : [];
for (const emoji of _emojis) {
this.cache.set(`${emoji.name} ${emoji.host}`, emoji);
this.emojisCache.set(`${emoji.name} ${emoji.host}`, emoji);
}
}
@ -401,7 +401,7 @@ export class CustomEmojiService implements OnApplicationShutdown {
@bindThis
public dispose(): void {
this.cache.dispose();
this.emojisCache.dispose();
}
@bindThis

2
packages/backend/src/core/RelayService.ts
View File

@ -35,7 +35,7 @@ export class RelayService {
private createSystemUserService: CreateSystemUserService,
private apRendererService: ApRendererService,
) {
this.relaysCache = new MemorySingleCache<MiRelay[]>(1000 * 60 * 10);
this.relaysCache = new MemorySingleCache<MiRelay[]>(1000 * 60 * 10); // 10m
}
@bindThis

6
packages/backend/src/core/RoleService.ts
View File

@ -127,10 +127,8 @@ export class RoleService implements OnApplicationShutdown, OnModuleInit {
private moderationLogService: ModerationLogService,
private fanoutTimelineService: FanoutTimelineService,
) {
//this.onMessage = this.onMessage.bind(this);
this.rolesCache = new MemorySingleCache<MiRole[]>(1000 * 60 * 60 * 1);
this.roleAssignmentByUserIdCache = new MemoryKVCache<MiRoleAssignment[]>(1000 * 60 * 60 * 1);
this.rolesCache = new MemorySingleCache<MiRole[]>(1000 * 60 * 60); // 1h
this.roleAssignmentByUserIdCache = new MemoryKVCache<MiRoleAssignment[]>(1000 * 60 * 5); // 5m
this.redisForSub.on('message', this.onMessage);
}

2
packages/backend/src/core/UserKeypairService.ts
View File

@ -25,7 +25,7 @@ export class UserKeypairService implements OnApplicationShutdown {
) {
this.cache = new RedisKVCache<MiUserKeypair>(this.redisClient, 'userKeypair', {
lifetime: 1000 * 60 * 60 * 24, // 24h
memoryCacheLifetime: Infinity,
memoryCacheLifetime: 1000 * 60 * 60, // 1h
fetcher: (key) => this.userKeypairsRepository.findOneByOrFail({ userId: key }),
toRedisConverter: (value) => JSON.stringify(value),
fromRedisConverter: (value) => JSON.parse(value),

4
packages/backend/src/core/activitypub/ApDbResolverService.ts
View File

@ -54,8 +54,8 @@ export class ApDbResolverService implements OnApplicationShutdown {
private cacheService: CacheService,
private apPersonService: ApPersonService,
) {
this.publicKeyCache = new MemoryKVCache<MiUserPublickey | null>(Infinity);
this.publicKeyByUserIdCache = new MemoryKVCache<MiUserPublickey | null>(Infinity);
this.publicKeyCache = new MemoryKVCache<MiUserPublickey | null>(1000 * 60 * 60 * 12); // 12h
this.publicKeyByUserIdCache = new MemoryKVCache<MiUserPublickey | null>(1000 * 60 * 60 * 12); // 12h
}
@bindThis

117
packages/backend/src/misc/cache.ts
View File

@ -7,23 +7,23 @@ import * as Redis from 'ioredis';
import { bindThis } from '@/decorators.js';
export class RedisKVCache<T> {
private redisClient: Redis.Redis;
private name: string;
private lifetime: number;
private memoryCache: MemoryKVCache<T>;
private fetcher: (key: string) => Promise<T>;
private toRedisConverter: (value: T) => string;
private fromRedisConverter: (value: string) => T | undefined;
private readonly lifetime: number;
private readonly memoryCache: MemoryKVCache<T>;
private readonly fetcher: (key: string) => Promise<T>;
private readonly toRedisConverter: (value: T) => string;
private readonly fromRedisConverter: (value: string) => T | undefined;
constructor(redisClient: RedisKVCache<T>['redisClient'], name: RedisKVCache<T>['name'], opts: {
constructor(
private redisClient: Redis.Redis,
private name: string,
opts: {
lifetime: RedisKVCache<T>['lifetime'];
memoryCacheLifetime: number;
fetcher: RedisKVCache<T>['fetcher'];
toRedisConverter: RedisKVCache<T>['toRedisConverter'];
fromRedisConverter: RedisKVCache<T>['fromRedisConverter'];
}) {
this.redisClient = redisClient;
this.name = name;
},
) {
this.lifetime = opts.lifetime;
this.memoryCache = new MemoryKVCache(opts.memoryCacheLifetime);
this.fetcher = opts.fetcher;
@ -55,7 +55,13 @@ export class RedisKVCache<T> {
const cached = await this.redisClient.get(`kvcache:${this.name}:${key}`);
if (cached == null) return undefined;
return this.fromRedisConverter(cached);
const value = this.fromRedisConverter(cached);
if (value !== undefined) {
this.memoryCache.set(key, value);
}
return value;
}
@bindThis
@ -66,6 +72,10 @@ export class RedisKVCache<T> {
/**
* キャッシュがあればそれを返し、無ければfetcherを呼び出して結果をキャッシュ&返します
* This awaits the call to Redis to ensure that the write succeeded, which is important for a few reasons:
* * Other code uses this to synchronize changes between worker processes. A failed write can internally de-sync the cluster.
* * Without an `await`, consecutive calls could race. An unlucky race could result in the older write overwriting the newer value.
* * Not awaiting here makes the entire cache non-consistent. The prevents many possible uses.
*/
@bindThis
public async fetch(key: string): Promise<T> {
@ -77,14 +87,14 @@ export class RedisKVCache<T> {
// Cache MISS
const value = await this.fetcher(key);
this.set(key, value);
await this.set(key, value);
return value;
}
@bindThis
public async refresh(key: string) {
const value = await this.fetcher(key);
this.set(key, value);
await this.set(key, value);
// TODO: イベント発行して他プロセスのメモリキャッシュも更新できるようにする
}
@ -101,23 +111,23 @@ export class RedisKVCache<T> {
}
export class RedisSingleCache<T> {
private redisClient: Redis.Redis;
private name: string;
private lifetime: number;
private memoryCache: MemorySingleCache<T>;
private fetcher: () => Promise<T>;
private toRedisConverter: (value: T) => string;
private fromRedisConverter: (value: string) => T | undefined;
private readonly lifetime: number;
private readonly memoryCache: MemorySingleCache<T>;
private readonly fetcher: () => Promise<T>;
private readonly toRedisConverter: (value: T) => string;
private readonly fromRedisConverter: (value: string) => T | undefined;
constructor(redisClient: RedisSingleCache<T>['redisClient'], name: RedisSingleCache<T>['name'], opts: {
lifetime: RedisSingleCache<T>['lifetime'];
constructor(
private redisClient: Redis.Redis,
private name: string,
opts: {
lifetime: number;
memoryCacheLifetime: number;
fetcher: RedisSingleCache<T>['fetcher'];
toRedisConverter: RedisSingleCache<T>['toRedisConverter'];
fromRedisConverter: RedisSingleCache<T>['fromRedisConverter'];
}) {
this.redisClient = redisClient;
this.name = name;
},
) {
this.lifetime = opts.lifetime;
this.memoryCache = new MemorySingleCache(opts.memoryCacheLifetime);
this.fetcher = opts.fetcher;
@ -149,7 +159,13 @@ export class RedisSingleCache<T> {
const cached = await this.redisClient.get(`singlecache:${this.name}`);
if (cached == null) return undefined;
return this.fromRedisConverter(cached);
const value = this.fromRedisConverter(cached);
if (value !== undefined) {
this.memoryCache.set(value);
}
return value;
}
@bindThis
@ -160,6 +176,10 @@ export class RedisSingleCache<T> {
/**
* キャッシュがあればそれを返し、無ければfetcherを呼び出して結果をキャッシュ&返します
* This awaits the call to Redis to ensure that the write succeeded, which is important for a few reasons:
* * Other code uses this to synchronize changes between worker processes. A failed write can internally de-sync the cluster.
* * Without an `await`, consecutive calls could race. An unlucky race could result in the older write overwriting the newer value.
* * Not awaiting here makes the entire cache non-consistent. The prevents many possible uses.
*/
@bindThis
public async fetch(): Promise<T> {
@ -171,14 +191,14 @@ export class RedisSingleCache<T> {
// Cache MISS
const value = await this.fetcher();
this.set(value);
await this.set(value);
return value;
}
@bindThis
public async refresh() {
const value = await this.fetcher();
this.set(value);
await this.set(value);
// TODO: イベント発行して他プロセスのメモリキャッシュも更新できるようにする
}
@ -187,22 +207,12 @@ export class RedisSingleCache<T> {
// TODO: メモリ節約のためあまり参照されないキーを定期的に削除できるようにする？
export class MemoryKVCache<T> {
/**
* データを持つマップ
* @deprecated これを直接操作するべきではない
*/
public cache: Map<string, { date: number; value: T; }>;
private lifetime: number;
private gcIntervalHandle: NodeJS.Timeout;
private readonly cache = new Map<string, { date: number; value: T; }>();
private readonly gcIntervalHandle = setInterval(() => this.gc(), 1000 * 60 * 3); // 3m
constructor(lifetime: MemoryKVCache<never>['lifetime']) {
this.cache = new Map();
this.lifetime = lifetime;
this.gcIntervalHandle = setInterval(() => {
this.gc();
}, 1000 * 60 * 3);
}
constructor(
private readonly lifetime: number,
) {}
@bindThis
/**
@ -287,27 +297,34 @@ export class MemoryKVCache<T> {
@bindThis
public gc(): void {
const now = Date.now();
for (const [key, { date }] of this.cache.entries()) {
if ((now - date) > this.lifetime) {
// The map is ordered from oldest to youngest.
// We can stop once we find an entry that's still active, because all following entries must *also* be active.
const age = now - date;
if (age < this.lifetime) break;
this.cache.delete(key);
}
}
}
@bindThis
public dispose(): void {
clearInterval(this.gcIntervalHandle);
}
public get entries() {
return this.cache.entries();
}
}
export class MemorySingleCache<T> {
private cachedAt: number | null = null;
private value: T | undefined;
private lifetime: number;
constructor(lifetime: MemorySingleCache<never>['lifetime']) {
this.lifetime = lifetime;
}
constructor(
private lifetime: number,
) {}
@bindThis
public set(value: T): void {

2
packages/backend/src/queue/processors/DeliverProcessorService.ts
View File

@ -45,7 +45,7 @@ export class DeliverProcessorService {
private queueLoggerService: QueueLoggerService,
) {
this.logger = this.queueLoggerService.logger.createSubLogger('deliver');
this.suspendedHostsCache = new MemorySingleCache<MiInstance[]>(1000 * 60 * 60);
this.suspendedHostsCache = new MemorySingleCache<MiInstance[]>(1000 * 60 * 60); // 1h
}
@bindThis

2
packages/backend/src/server/NodeinfoServerService.ts
View File

@ -134,7 +134,7 @@ export class NodeinfoServerService {
return document;
};
const cache = new MemorySingleCache<Awaited<ReturnType<typeof nodeinfo2>>>(1000 * 60 * 10);
const cache = new MemorySingleCache<Awaited<ReturnType<typeof nodeinfo2>>>(1000 * 60 * 10); // 10m
fastify.get(nodeinfo2_1path, async (request, reply) => {
const base = await cache.fetch(() => nodeinfo2(21));

2
packages/backend/src/server/api/AuthenticateService.ts
View File

@ -37,7 +37,7 @@ export class AuthenticateService implements OnApplicationShutdown {
private cacheService: CacheService,
) {
this.appCache = new MemoryKVCache<MiApp>(Infinity);
this.appCache = new MemoryKVCache<MiApp>(1000 * 60 * 60 * 24 * 7); // 1w
}
@bindThis