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From "Lei (Eddy) Xu (JIRA)" <j...@apache.org>
Subject [jira] [Updated] (HDFS-6729) Support maintenance mode for DN
Date Tue, 27 Jan 2015 21:53:35 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: HDFS-6729.005.patch

Updated the patch to fix the failed test.

Hey, [~andrew.wang], thanks for your quick review :). Yes. this {{maintenance mode}} is a
soft state. NN restarts / failovers are relatively rare events. Even in NN restarts / failover
scenarios, NN can treat this DN as stale / dead, which does not sacrifice the durability /
availability of DN. 

> 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, HDFS-6729.001.patch, HDFS-6729.002.patch, HDFS-6729.003.patch,
HDFS-6729.004.patch, HDFS-6729.005.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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