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From "Andrew Wang (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HDFS-6729) Support maintenance mode for DN
Date Sat, 24 Jan 2015 00:04:34 GMT

    [ https://issues.apache.org/jira/browse/HDFS-6729?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14290240#comment-14290240
] 

Andrew Wang commented on HDFS-6729:
-----------------------------------

Hey Eddy, quick question, this looks like soft state that isn't persisted across NN restarts
/ failovers. Is that suitable for the target usecases?

> 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
>
>
> 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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