[jira] [Created] (HDFS-8551) Fix hdfs datanode CLI usage message

["Xiaoyu Yao (JIRA)" <ji...@apache.org>]

Xiaoyu Yao created HDFS-8551:
--------------------------------

             Summary: Fix hdfs datanode CLI usage message
                 Key: HDFS-8551
                 URL: https://issues.apache.org/jira/browse/HDFS-8551
             Project: Hadoop HDFS
          Issue Type: Bug
    Affects Versions: 2.6.0
            Reporter: Xiaoyu Yao
            Assignee: Xiaoyu Yao


There are two issues with current "hdfs datanode" usage message below.

{code}
Usage: java DataNode [-regular | -rollback]
    -regular                 : Normal DataNode startup (default).
    -rollback                : Rollback a standard or rolling upgrade.
  Refer to HDFS documentation for the difference between standard
  and rolling upgrades.
{code}

1. "java DataNode" should be "hdfs datanode"
2. "rollingupgrace" option is missing but it is document correctly in the [link|http://hadoop.apache.org/docs/r2.7.0/hadoop-project-dist/hadoop-hdfs/HDFSCommands.html#datanode].


{code}
Usage: hdfs datanode [-regular | -rollback | -rollingupgrace rollback]

COMMAND_OPTION	Description
-regular	Normal datanode startup (default).
-rollback	Rollback the datanode to the previous version. This should be used after stopping the datanode and distributing the old hadoop version.
-rollingupgrade rollback	Rollback a rolling upgrade operation.
{code}



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