[jira] [Created] (HDFS-11753) Make Some Enhancements about JournalNode Daemon

[Doris Gu (JIRA)]

Doris Gu created HDFS-11753:
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             Summary: Make Some Enhancements about JournalNode Daemon 
                 Key: HDFS-11753
                 URL: https://issues.apache.org/jira/browse/HDFS-11753
             Project: Hadoop HDFS
          Issue Type: Improvement
          Components: journal-node
    Affects Versions: 3.0.0-alpha2
            Reporter: Doris Gu


1.Add support -h. Right now, if I use *hdfs journalnode -h* , I straightly 
start journalnode daemon. But generally speaking， I just want to look at the 
usage.

2.Add exception catch and termination. If I start journalnode with different 
directions stored pids, I get servel journalnode daemons which I don't want for 
I config the same port.



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