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https://issues.apache.org/jira/browse/HDFS-9016?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15246223#comment-15246223
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Allen Wittenauer commented on HDFS-9016:
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If it changes the output in any way/shape/form, it's not backward compatible.
See
http://hadoop.apache.org/docs/stable/hadoop-project-dist/hadoop-common/Compatibility.html#Command_Line_Interface_CLI
.
> Display upgrade domain information in fsck
> ------------------------------------------
>
> Key: HDFS-9016
> URL: https://issues.apache.org/jira/browse/HDFS-9016
> Project: Hadoop HDFS
> Issue Type: Sub-task
> Reporter: Ming Ma
> Assignee: Ming Ma
> Attachments: HDFS-9016.patch
>
>
> This will make it easy for people to use fsck to check block placement when
> upgrade domain is enabled.
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