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https://issues.apache.org/jira/browse/HDFS-5360?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13797083#comment-13797083
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Andrew Wang commented on HDFS-5360:
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+1 pending Jenkins, thanks for your contribution
> Improvement of usage message of renameSnapshot and deleteSnapshot
> -----------------------------------------------------------------
>
> Key: HDFS-5360
> URL: https://issues.apache.org/jira/browse/HDFS-5360
> Project: Hadoop HDFS
> Issue Type: Improvement
> Components: snapshots
> Affects Versions: 3.0.0
> Reporter: Shinichi Yamashita
> Assignee: Shinichi Yamashita
> Priority: Minor
> Attachments: HDFS-5360.patch, HDFS-5360.patch
>
>
> When the argument of "hdfs dfs -createSnapshot" comamnd is inappropriate, it
> is displayed as follows.
> {code}
> [hadoop@trunk ~]$ hdfs dfs -createSnapshot
> -createSnapshot: <snapshotDir> is missing.
> Usage: hadoop fs [generic options] -createSnapshot <snapshotDir>
> [<snapshotName>]
> {code}
> On the other hands, the commands of "-renameSnapshot" and "-deleteSnapshot"
> is displayed as follows. And there are not kind for the user.
> {code}
> [hadoop@trunk ~]$ hdfs dfs -renameSnapshot
> renameSnapshot: args number not 3: 0
> [hadoop@trunk ~]$ hdfs dfs -deleteSnapshot
> deleteSnapshot: args number not 2: 0
> {code}
> It changes "-renameSnapshot" and "-deleteSnapshot" to output the message
> which is similar to "-createSnapshot".
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