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From "Hudson (JIRA)" <j...@apache.org>
Subject [jira] Commented: (HDFS-457) better handling of volume failure in Data Node storage
Date Tue, 18 Aug 2009 11:32:17 GMT

    [ https://issues.apache.org/jira/browse/HDFS-457?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12744463#action_12744463
] 

Hudson commented on HDFS-457:
-----------------------------

Integrated in Hadoop-Hdfs-trunk #53 (See [http://hudson.zones.apache.org/hudson/job/Hadoop-Hdfs-trunk/53/])
    . Do not shutdown datanode if some, but not all, volumns fail.  Contributed by Boris Shkolnik


> better handling of volume failure in Data Node storage
> ------------------------------------------------------
>
>                 Key: HDFS-457
>                 URL: https://issues.apache.org/jira/browse/HDFS-457
>             Project: Hadoop HDFS
>          Issue Type: Improvement
>          Components: data-node
>            Reporter: Boris Shkolnik
>            Assignee: Boris Shkolnik
>             Fix For: 0.21.0
>
>         Attachments: HDFS-457-1.patch, HDFS-457-2.patch, HDFS-457-2.patch, HDFS-457-2.patch,
HDFS-457-3.patch, HDFS-457.patch, TestFsck.zip
>
>
> Current implementation shuts DataNode down completely when one of the configured volumes
of the storage fails.
> This is rather wasteful behavior because it  decreases utilization (good storage becomes
unavailable) and imposes extra load on the system (replication of the blocks from the good
volumes). These problems will become even more prominent when we move to mixed (heterogeneous)
clusters with many more volumes per Data Node.

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