some times you will find the master in a hbase cluster cannot be stopped, so check the following two items suggested by some guy in hbase user mail list.
But I'm not sure it helps.
> If zookeeper is not running (or do not have the quorum) in a cluster setup, hbase does not go down..bring up zookeeper
-> Make sure pid file is not under /tmp...somtimes files get cleaned out of tmp..Change *env.sh to point to diff dir.

本文探讨了HBase集群中Master节点无法正常停止的问题,并提供了两种可能的解决方案:一是检查ZooKeeper是否正常运行并拥有法定投票数;二是确认HBase的PID文件路径不在/tmp目录下,以避免因该目录被清理而导致的问题。
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