Xiaoyu Yao created HDFS-8551:
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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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