1. 通过zkServer.sh启动zookeeper时，正常指定的QuorumPeerMain作为启动主类。

2.QuorumPeerMain执行main方法，里面主要逻辑是执行initializeAndRun方法。

 

 public static void main(String[] args) {
        QuorumPeerMain main = new QuorumPeerMain();
        try {
            main.initializeAndRun(args);
        ....
    }

3.initializeAndRun方法

 

  （1）通过QuorumPeerConfig.parse方法，解析配置文件

  （2）通过DatadirCleanupManager.start方法，启动清除调度任务

  （3）runFromConfig或ZooKeeperServerMain.main来启动zookkeeper

 

protected void initializeAndRun(String[] args)
        throws ConfigException, IOException, AdminServerException
    {
        QuorumPeerConfig config = new QuorumPeerConfig();
        if (args.length == 1) {//如果指定的配置文件
            config.parse(args[0]);//解析配置文件
        }

        // Start and schedule the the purge task
        //启动安排清除任务
        DatadirCleanupManager purgeMgr = new DatadirCleanupManager(config
                .getDataDir(), config.getDataLogDir(), config
                .getSnapRetainCount(), config.getPurgeInterval());
        purgeMgr.start();

        if (args.length == 1 && config.isDistributed()) {
            runFromConfig(config);//启动zookeepeer集群
        } else {
            LOG.warn("Either no config or no quorum defined in config, running "
                    + " in standalone mode");
            // there is only server in the quorum -- run as standalone
            ZooKeeperServerMain.main(args);
        }
    }

 

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