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https://issues.apache.org/jira/browse/HDFS-532?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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dhruba borthakur updated HDFS-532:
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Status: Patch Available (was: Open)
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[exec] +1 @author. The patch does not contain any @author tags.
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[exec] +1 tests included. The patch appears to include 3 new or
modified tests.
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[exec] +1 javadoc. The javadoc tool did not generate any warning
messages.
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[exec] +1 javac. The applied patch does not increase the total number
of javac compiler warnings.
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[exec] +1 findbugs. The patch does not introduce any new Findbugs
warnings.
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[exec] +1 release audit. The applied patch does not increase the
total number of release audit warnings.
{quote}
> 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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