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<a class="post-title-link" href="/2019/05/19/redis-pipeline/" itemprop="url">Redis Pipeline</a></h1>
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Redis pipeline 功能简介在命令行中是没有Redis pipeline功能的，但redis是支持pipeline的，而且在各个语言版的client中都有相应的实现。
简单概括redis pipeline的功能就是将单次请求变为批量请求。
由于网络开销延迟，就算redis server端有
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<a class="post-title-link" href="/2019/05/19/nsq-handle-message/" itemprop="url">NSQD 消息处理流程</a></h1>
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NSQD 消息处理整体流程
memoryMsgChan 和 backendMsgChanmemoryMsgChan：为内存缓冲区，Topic和Channel内存缓冲区的大小可以通过同一变量mem-queue-size来进行配置。
backendMsgChan：为磁盘优先级队列。通过diskqueue
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<a class="post-title-link" href="/2019/05/19/mysql-lock/" itemprop="url">Mysql锁</a></h1>
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CAS (Compare and Swap)乐观锁具体实现细节：主要就是两个步骤：冲突检测和数据更新。还有一种比较典型的就是Compare and Swap(CAS)。
CAS 操作包含三个操作数 —— 内存位置（V）、预期原值（A）和新值(B)。如果内存位置的值与预期原值相匹配，那么处理器会自动
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<a class="post-title-link" href="/2019/05/19/distributed-system-outline/" itemprop="url">分布式系统route map</a></h1>
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分布式系统这里主要对分布式系统的定义、应用甚至意义来做一些阐述。有一个统揽全局的概念。
应用：分布式操作系统，分布式文件系统，分布式存储系统(分布式数据库、缓存、消息队列等)。
这里主要是针对分布式存储系统来展开。
分布式系统的理论基础基本概念基本概念：状态特征：无状态、系统重发、幂等性、 并行、并
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<a class="post-title-link" href="/2019/05/19/distributed-lock-based-on-redis-cluster/" itemprop="url">基于Redis集群的分布式锁</a></h1>
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2019-05-19
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分布式锁 Redlock由于前面介绍的基于单Redis节点的分布式锁在failover的时候会产生解决不了的安全性问题，因此antirez提出了新的分布式锁的算法Redlock，它基于N个完全独立的Redis节点（通常情况下N可以设置成5）。
运行Redlock算法的客户端依次执行下面各个步骤，来完
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