zookeeper流程

Zookeeper流程

原理概括 Zookeeper的核心是原子广播，这个机制保证了各个Server之间的同步。实现这个机制的协议叫做Zab协议。Zab协议有两种模式，它们分别是恢复模式（选主）和广播模式（同步）。当服务启动或者在领导者崩溃后，Zab就进入了恢复模式，当...

zookeeper同步流程

Zookeeper 启动流程

1.首先创建一个ServerConnectionFactory(这里先分析基于direct NIO，3.4引入了netty)，用来监听zkClient的消息并创建ServerConnection处理读写请求 2.ZookeeperServer进行数据恢复：创建ZKDatabase并将PlaybackListener传入，然后ZKDB首先...

Zookeeper Server端流程

这里以读为例：对于读请求，由ServerConn进行数据读取，并将数据提交到ZookeeperServer 4.ZKServer将Session加入到SessionTracker后，把拿到的数据封装为Request对象提交到RequestProcessor chain进行处理 5.最后到FinalProcessor生成...

ZooKeeper写数据流程

Zookeeper Client端流程

当ClientConnSocket接收到消息时，调用SendThread进行读请求处理，构建ReplyHeader并调用EventThread将WatchEvent（如果设定的话）加入waitingEvent列表 4.EventThread异步检查waitingEvent，发现后调用Watcher的process流程，由watcher...

Zookeeper选主流程是什么？

Zookeeper的会话管理和读写流程

就想像程我们web应用中的session,每次请求访问都会重新刷新过期时间点，zookeeper也需要重新更新会话的ExpirationTime，这一个过程叫做Session激活。下面两种方式都会重新触发Session 激活：客户端每向服务端发送请求，包括读请求和写请求...

zookeeper事件监听流程是什么？

蚂蚁面试官：Zookeeper 的选举流程是怎样的？我当场懵逼了

有一说一，Zookeeper 这些工作原理、选举流程，也许大多数人在工作中不会用到，但了解多一点也是自己的优势，避免求职面试被面试官打压工资。Zookeeper 也是现在后端主流的分布式协调框架，很多热门框架都有直接或者间接依赖它，比如：...

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