zookeeper 服务端Follower启动-细节分析

最新推荐文章于 2022-05-04 23:25:48 发布

L25809

最新推荐文章于 2022-05-04 23:25:48 发布

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文章标签： zookeeper

本文链接：https://blog.youkuaiyun.com/L25809/article/details/121664089

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本文深入剖析了Zookeeper中Follower的启动流程，详细介绍了从读取信息的Learner.readPacket()到处理信息的Follower.processPacket()的步骤，揭示了Follower如何在服务端跟随Leader进行工作。

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2021SC@SDUSC

zookeeper 服务端Follower启动-细节分析

1、读取信息

Follower.followLeader()

Learner.readPacket()

2、处理信息

Follower.processPacket()

2021SC@SDUSC

`zookeeper 服务端Follower启动-细节分析`

`1、读取信息`

`Follower.followLeader()`

    void followLeader() throws InterruptedException {
        self.end_fle = Time.currentElapsedTime();
        long electionTimeTaken = self.end_fle - self.start_fle;
        self.setElectionTimeTaken(electionTimeTaken);
        LOG.info("FOLLOWING - LEADER ELECTION TOOK - {} {}", electionTimeTaken,
                QuorumPeer.FLE_TIME_UNIT);
        self.start_fle = 0;
        self.end_fle = 0;
        fzk.registerJMX(new FollowerBean(this, zk), self.jmxLocalPeerBean);
        try {
            QuorumServer leaderServer = findLeader();            
            try {
                connectToLeader(leaderServer.addr, leaderServer.hostname);
                long newEpochZxid = registerWithLeader(Leader.FOLLOWERINFO);
                if (self.isReconfigStateChange())
                   throw new Exception("learned about role change");