1 问题 Whenever you expose a web service / api endpoint, you need to implement a rate limiter to prevent abuse of the service (DOS attacks). Implement a RateLimiter Class with an isAllow method. Every request comes in with a unique clientID, deny a req…

/* * 359. Logger Rate Limiter * 2016-7-14 by Mingyang * 很简单的HashMap,不详谈 */ class Logger { HashMap<String, Integer> map; /** Initialize your data structure here. */ public Logger() { map = new HashMap<String, Integer>(); } /** * Returns true if…

Whenever you expose a web service / api endpoint, you need to implement a rate limiter to prevent abuse of the service (DOS attacks). Implement a RateLimiter Class with an isAllow method. Every request comes in with a unique clientID, deny a request…

这次的项目我们重点关注RocksDB中的一个环节:Rate Limiter.其实Rate Limiter的思想在很多其他系统中也很常用. 在RocksDB中,后台会实时运行compaction和flush操作,这些都会对磁盘进行大量的写操作.可以通过Rate Limiter来控制最大写入速度的上限.因为在某些场景下,突发的大量写入会导致很大的read latency,从而影响系统性能. Rate Limiter的基本原理是令牌桶算法:系统每秒往桶里丢数量为1/QPS的令牌(满了为止),写请求只有…

Design a logger system that receive stream of messages along with its timestamps, each message should be printed if and only if it is not printed in the last 10 seconds. Given a message and a timestamp (in seconds granularity), return true if the mes…

Problem: Design a logger system that receive stream of messages along with its timestamps, each message should be printed if and only if it is not printed in the last 10 seconds. Given a message and a timestamp (in seconds granularity), return true i…

原题链接在这里:https://leetcode.com/problems/logger-rate-limiter/ 题目: Design a logger system that receive stream of messages along with its timestamps, each message should be printed if and only if it is not printed in the last 10 seconds. Given a message a…

先存着,以后再写 http://iamzhongyong.iteye.com/blog/1982113 http://baike.baidu.com/view/2530454.htm https://en.wikipedia.org/wiki/Token_bucket…

［抄题］: Design a logger system that receive stream of messages along with its timestamps, each message should be printed if and only if it is not printed in the last 10 seconds. Given a message and a timestamp (in seconds granularity), return true if t…

Design a logger system that receive stream of messages along with its timestamps, each message should be printed if and only if it is not printed in the last 10 seconds. Given a message and a timestamp (in seconds granularity), return true if the mes…