1.概述

打开zookeeper集群之后，zk正常，但是kafka启动之后总是会挂掉，查找logs日志里的server.log文件发现问题：

问题：A broker is already registered on the path /brokers/ids/0. This probably indicates that you either have configured a brokerid that is already in use, or else you have shutdown this broker and restarted it faster than the zookeeper timeout so it appears to be re-registering.

这可能是之前机器因为卡死或物理重启，kafka broker没有正常下线，zk上还保留着它的broker id。所以直接删除zk上brokerid就可以了。

具体解决步骤如下： 1、进入zookeeper的客户端

[admin@hadoop102 zookeeper