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https://issues.apache.org/jira/browse/HDFS-8551?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14590368#comment-14590368
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Hudson commented on HDFS-8551:
------------------------------
SUCCESS: Integrated in Hadoop-Hdfs-trunk #2159 (See
[https://builds.apache.org/job/Hadoop-Hdfs-trunk/2159/])
HDFS-8551. Fix hdfs datanode CLI usage message. Contributed by Brahma Reddy
Battula. (xyao: rev 9cd5ad9d84e46295249877ade50cd49c34b9bf12)
*
hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/server/datanode/DataNode.java
* hadoop-hdfs-project/hadoop-hdfs/CHANGES.txt
> 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: Brahma Reddy Battula
> Fix For: 2.8.0
>
> Attachments: HDFS-8551-002.patch, HDFS-8551-003.patch, HDFS-8551.patch
>
>
> 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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