Go语言缓存击穿：热点key防护

Go语言缓存击穿：热点key防护

1. 互斥锁防护

func (c *CacheWithProtection) GetWithLock(ctx context.Context, key string, fn func() (string, error)) (string, error) { val, err := c.cache.Get(ctx, key) if err == nil { return val, nil } lockKey := "lock:" + key acquired := c.tryAcquireLock(ctx, lockKey) if !acquired { time.Sleep(100 * time.Millisecond) return c.GetWithLock(ctx, key, fn) } defer c.releaseLock(ctx, lockKey) val, err = c.cache.Get(ctx, key) if err == nil { return val, nil } newVal, err := fn() if err != nil { return "", err } c.cache.Set(ctx, key, newVal, time.Minute*10) return newVal, nil }

2. 总结

缓存击穿防护通过互斥锁或热点数据永不过期等方式实现。