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https://issues.apache.org/jira/browse/HDFS-5079?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15732634#comment-15732634
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Kihwal Lee commented on HDFS-5079:
----------------------------------

This doesn't seem to much value while breaking compatibility during rolling 
upgrade.
I propose revert.

> Cleaning up NNHAStatusHeartbeat.State DatanodeProtocolProtos.
> -------------------------------------------------------------
>
>                 Key: HDFS-5079
>                 URL: https://issues.apache.org/jira/browse/HDFS-5079
>             Project: Hadoop HDFS
>          Issue Type: Improvement
>          Components: datanode, namenode
>    Affects Versions: 3.0.0-alpha1
>            Reporter: Konstantin Shvachko
>            Assignee: Tao Luo
>             Fix For: 3.0.0-alpha1
>
>         Attachments: HDFS-5079.patch
>
>
> NNHAStatusHeartbeat.State was removed from usage by HDFS-4268. The respective 
> class should also be removed from DatanodeProtocolProtos.



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