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From "Lei (Eddy) Xu (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HDFS-6729) Support maintenance mode for DN
Date Tue, 22 Jul 2014 20:46:41 GMT

    [ https://issues.apache.org/jira/browse/HDFS-6729?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14070869#comment-14070869
] 

Lei (Eddy) Xu commented on HDFS-6729:
-------------------------------------

Hi, [~aw]. We have cases users to upgrade RAM and/or add disks etc., which only takes a short
amount of time (e.g., 10 minutes downtime). It might not need to report missing data on this
DN if the users are certain that the DN will come back shortly.

> 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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