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From "Lei (Eddy) Xu (JIRA)" <j...@apache.org>
Subject [jira] [Updated] (HDFS-6729) Support maintenance mode for DN
Date Thu, 21 Aug 2014 22:18:14 GMT

     [ https://issues.apache.org/jira/browse/HDFS-6729?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Lei (Eddy) Xu updated HDFS-6729:
--------------------------------

    Attachment: hadoop-6729.000.patch

> 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: 2.5.0
>            Reporter: Lei (Eddy) Xu
>            Assignee: Lei (Eddy) Xu
>         Attachments: hadoop-6729.000.patch
>
>
> Some maintenance works (e.g., upgrading RAM or add disks) on DataNode only takes a short
amount of time (e.g., 10 minutes). In these cases, the users do not want to report missing
blocks on this DN because the DN will be online shortly without data lose. Thus, 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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