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https://issues.apache.org/jira/browse/HDFS-9389?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15282212#comment-15282212
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Ming Ma commented on HDFS-9389:
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[~eddyxu] thank you!
> Add maintenance states to AdminStates
> -------------------------------------
>
> Key: HDFS-9389
> URL: https://issues.apache.org/jira/browse/HDFS-9389
> Project: Hadoop HDFS
> Issue Type: Sub-task
> Reporter: Ming Ma
> Assignee: Ming Ma
> Fix For: 2.9.0
>
> Attachments: HDFS-9389.patch
>
>
> This jira will add {{ENTERING_MAINTENANCE}} and {{IN_MAINTENANCE}} to
> {{AdminStates}} and protobuf. It will also provide the basic functionality to
> transition DN into or out of maintenance state from DN's state machine's
> point of view. The actual admins support and block management will be covered
> by separate jiras.
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