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https://issues.apache.org/jira/browse/HDFS-9016?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15325062#comment-15325062
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Lei (Eddy) Xu commented on HDFS-9016:
-------------------------------------

IMO,  when the user does not use new/additional flags, the output is the 
exactly same as previous result, then the patch is backward-compatible. 
Otherwise, it would be difficult to add any feature to branch-2.

My 2 cents. Thanks.

> 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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