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https://issues.apache.org/jira/browse/MAPREDUCE-6367?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14547421#comment-14547421
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Ted Malaska commented on MAPREDUCE-6367:
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After more review this bug was in a different implementation.
Please close and kill this jira. thanks
> UniformSizeInputFormat skews left over bytes to last split
> ----------------------------------------------------------
>
> Key: MAPREDUCE-6367
> URL: https://issues.apache.org/jira/browse/MAPREDUCE-6367
> Project: Hadoop Map/Reduce
> Issue Type: Bug
> Affects Versions: 2.6.0, 2.5.2
> Reporter: Ted Malaska
> Assignee: Ted Malaska
> Priority: Minor
>
> In UniformSizeInputFormat it is trying to get equal amount of bytes to every
> split. But the logic today will result in every split having a little less
> then the perfect amount and that left over from every split will be put into
> the last split.
> Resulting in a large skew for the last split.
> Below if the area of the code that is affected:
> https://github.com/apache/hadoop/blob/9ae7f9eb7baeb244e1b95aabc93ad8124870b9a9/hadoop-tools/hadoop-distcp/src/main/java/org/apache/hadoop/tools/mapred/UniformSizeInputFormat.java#L98
> The fix would be to change the following line:
> currentSplitSize += srcFileStatus.getLen();
> to
> currentSplitSize += srcFileStatus.getLen() + (currentSplitSize -
> nBytesPerSplit);
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