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https://issues.apache.org/jira/browse/HDFS-11806?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16312702#comment-16312702
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Doris Gu commented on HDFS-11806:
---------------------------------
Notice journalnode does not parse general options so far, make
{{printGenericCommandUsage}} to {{false}} in patch 002, the modification is
like this:
*Before*
{quote}[root@localhost ~]# hdfs journalnode -h
2018-01-05 08:03:32,384 INFO server.JournalNode: STARTUP_MSG:
/************************************************************
STARTUP_MSG: Starting JournalNode
STARTUP_MSG: host = localhost/172.17.0.19
STARTUP_MSG: args = [-h]
STARTUP_MSG: version = 3.1.0-SNAPSHOT
...{quote}
*After*
{quote}[root@localhost ~]# hdfs journalnode -h
Usage: hdfs journalnode
JournalNode is a necessary role in a typical HA cluster with QJM. It
allows a NameNode to read and write edit logs stored on it's local disk. Note
that you should run an odd number of JNs, (i.e. 3, 5, 7, etc.), since edit log
modifications must be written to a majority of JNs.
[root@localhost ~]# {quote}
[~sureshms] [~bharatviswa], could you please review this issue for me? Thanks
very much!
Tips: Due to [https://issues.apache.org/jira/browse/HADOOP-14818], need to test
'-h' when there's no active journalnode daemon already, or you'll got
{{journalnode is running as process ...}} error.
> hdfs journalnode command should support meaningful --help
> ---------------------------------------------------------
>
> Key: HDFS-11806
> URL: https://issues.apache.org/jira/browse/HDFS-11806
> Project: Hadoop HDFS
> Issue Type: Improvement
> Affects Versions: 2.8.0, 3.0.0-alpha2, 3.1.0
> Reporter: Doris Gu
> Attachments: HDFS-11806.001.patch, HDFS-11806.002.patch
>
>
> Most (sub) commands support -help or -h options for detailed help while hdfs
> journalnode does not. What's worse, when you use "hdfs journalnode -h" to get
> some help, journalnode daemon starts straightly.
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