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https://issues.apache.org/jira/browse/HDFS-6729?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14070852#comment-14070852
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Allen Wittenauer commented on HDFS-6729:
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What types of operations are expected to be done while the DN is in maint mode?
> Support maintenance mode for DN
> -------------------------------
>
> Key: HDFS-6729
> URL: https://issues.apache.org/jira/browse/HDFS-6729
> Project: Hadoop HDFS
> Issue Type: Improvement
> Components: datanode
> Affects Versions: 2.4.0
> Reporter: Lei (Eddy) Xu
>
> We need a maintenance mode for a DN so that maintenance work can be carried
> out on the DN without having to decommission it or the DN being marked as
> dead.
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