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