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From "Scott Chen (JIRA)" <j...@apache.org>
Subject [jira] Commented: (MAPREDUCE-1908) DistributedRaidFileSystem does not handle ChecksumException correctly
Date Thu, 07 Oct 2010 20:31:32 GMT

    [ https://issues.apache.org/jira/browse/MAPREDUCE-1908?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12919051#action_12919051
] 

Scott Chen commented on MAPREDUCE-1908:
---------------------------------------

Ram: Can you add one more unit test that corrupt more than one block in the stripe?

> DistributedRaidFileSystem does not handle ChecksumException correctly
> ---------------------------------------------------------------------
>
>                 Key: MAPREDUCE-1908
>                 URL: https://issues.apache.org/jira/browse/MAPREDUCE-1908
>             Project: Hadoop Map/Reduce
>          Issue Type: Bug
>            Reporter: Ramkumar Vadali
>            Assignee: Ramkumar Vadali
>         Attachments: MAPREDUCE-1908.patch
>
>
> ChecksumException reports the offset of corruption within a block,
> whereas DistributedRaidFileSystem.setAlternateLocations was expecting it
> to report the offset of corruption within the file.
> The best way of dealing with a missing block/corrupt block is to just
> use the current seek offset in the file as the position of corruption.

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