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Date: Thu, 21 Aug 2014 23:12:13 +0000 (UTC)
From: "Lei (Eddy) Xu (JIRA)" <jira@apache.org>
To: hdfs-issues@hadoop.apache.org
Message-ID: <JIRA.12728965.1406061395690.7389.1408662733552@arcas>
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Subject: [jira] [Updated] (HDFS-6729) Support maintenance mode for DN
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     [ https://issues.apache.org/jira/browse/HDFS-6729?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

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

    Attachment: HDFS-6729.000.patch

Update patch to correct file name.

> 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: HDFS-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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