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https://issues.apache.org/jira/browse/HADOOP-3827?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12617007#action_12617007
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Arun C Murthy commented on HADOOP-3827:
---------------------------------------
The test failure in TestCopyFiles is unrelated - I've checked that it works
locally.
> Jobs with empty map-outputs and intermediate compression fail
> -------------------------------------------------------------
>
> Key: HADOOP-3827
> URL: https://issues.apache.org/jira/browse/HADOOP-3827
> Project: Hadoop Core
> Issue Type: Bug
> Components: mapred
> Affects Versions: 0.18.0
> Reporter: Arun C Murthy
> Assignee: Arun C Murthy
> Priority: Blocker
> Fix For: 0.18.0
>
> Attachments: HADOOP-3827_0_20080724.patch
>
>
> The corner case where there are zero map-outputs doesn't pass the codec to
> the IFile.Writer leading to un-compressed data and subsequently failure on
> the reduce when it tries to decompress that data.
> The straight-forward fix is to pass the codec:
> {noformat}
> Writer<K, V> writer = new Writer<K, V>(job, finalOut,
> - keyClass, valClass, null);
> + keyClass, valClass, codec);
> {noformat}
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