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From "Hudson (JIRA)" <j...@apache.org>
Subject [jira] Commented: (HDFS-532) Allow applications to know that a read request failed because block is missing
Date Fri, 14 Aug 2009 13:37:14 GMT

    [ https://issues.apache.org/jira/browse/HDFS-532?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12743196#action_12743196
] 

Hudson commented on HDFS-532:
-----------------------------

Integrated in Hadoop-Hdfs-trunk #49 (See [http://hudson.zones.apache.org/hudson/job/Hadoop-Hdfs-trunk/49/])
    . Allow applications to know that a read request failed 
because block is missing. (dhruba)


> Allow applications to know that a read request failed because block is missing
> ------------------------------------------------------------------------------
>
>                 Key: HDFS-532
>                 URL: https://issues.apache.org/jira/browse/HDFS-532
>             Project: Hadoop HDFS
>          Issue Type: Improvement
>          Components: hdfs client
>            Reporter: dhruba borthakur
>            Assignee: dhruba borthakur
>             Fix For: 0.21.0
>
>         Attachments: BlockMissingException.patch, BlockMissingException2.txt
>
>
> I have an application that has intelligence to retrieve data from alternate locations
if HDFS cannot provide this data. This can happen when data in HDFS is corrupted or the block
is missing. HDFS already throws ChecksumException if the block is corrupted and throws a generic
IOException if the block is missing. I would like HDFS to throw BlockMissingException when
a read request encounters a block that has no locations associated with it.

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