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From "Boris Shkolnik (JIRA)" <j...@apache.org>
Subject [jira] Commented: (HDFS-457) better handling of volume failure in Data Node storage
Date Fri, 17 Jul 2009 19:34:14 GMT

    [ https://issues.apache.org/jira/browse/HDFS-457?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12732695#action_12732695
] 

Boris Shkolnik commented on HDFS-457:
-------------------------------------

we should also handle failed reads from the failed volumes.
we can take care of it in FSDataset.validateBlockFile() because it is called on every "read"
operation.

> 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: Bug
>          Components: data-node
>            Reporter: Boris Shkolnik
>            Assignee: Boris Shkolnik
>
> 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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