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From "Jeff Zhang (JIRA)" <j...@apache.org>
Subject [jira] Commented: (HDFS-457) better handling of volume failure in Data Node storage
Date Tue, 29 Jun 2010 07:31:54 GMT

    [ https://issues.apache.org/jira/browse/HDFS-457?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12883447#action_12883447
] 

Jeff Zhang commented on HDFS-457:
---------------------------------

This is my first patch on HDFS, not sure whether it is right to attach the patch here. or
do need to create a new jira for this issue ?

> 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, HDFS-457_20-append.patch, HDFS_457.patch, jira.HDFS-457.branch-0.20-internal.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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