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https://issues.apache.org/jira/browse/HDFS-6917?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14109731#comment-14109731
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Colin Patrick McCabe commented on HDFS-6917:
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* I made it so that if you run the commands with no arguments, you get a
detailed help message about them.
* moved 'debug' command to sorted order in case statement
> Add an hdfs debug command to validate blocks, call recoverlease, etc.
> ---------------------------------------------------------------------
>
> Key: HDFS-6917
> URL: https://issues.apache.org/jira/browse/HDFS-6917
> Project: Hadoop HDFS
> Issue Type: Bug
> Components: hdfs-client
> Affects Versions: 2.6.0
> Reporter: Colin Patrick McCabe
> Assignee: Colin Patrick McCabe
> Attachments: HDFS-6917.001.patch, HDFS-6917.002.patch
>
>
> HDFS should have a debug command which could validate HDFS block files, call
> recoverLease, and have some other functionality. These commands would be
> purely for debugging and would appear under a separate command hierarchy
> inside the hdfs command. There would be no guarantee of API stability for
> these commands and the debug submenu would not be listed by just typing the
> "hdfs" command.
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