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https://issues.apache.org/jira/browse/MAPREDUCE-1059?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12793401#action_12793401
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Aaron Kimball commented on MAPREDUCE-1059:
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Failing contrib tests are streaming regressions. No new unit tests for this
patch because it is a small patch and testing this behavior with unit tests
would be challenging. A functional test plan was outlined in my previous
comment.
> distcp can generate uneven map task assignments
> -----------------------------------------------
>
> Key: MAPREDUCE-1059
> URL: https://issues.apache.org/jira/browse/MAPREDUCE-1059
> Project: Hadoop Map/Reduce
> Issue Type: Bug
> Components: distcp
> Reporter: Aaron Kimball
> Assignee: Aaron Kimball
> Attachments: MAPREDUCE-1059.2.patch, MAPREDUCE-1059.3.patch,
> MAPREDUCE-1059.patch
>
>
> distcp writes out a SequenceFile containing the source files to transfer, and
> their sizes. Map tasks are created over spans of this file, representing
> files which each mapper should transfer. In practice, some transfer loads
> yield many empty map tasks and a few tasks perform the bulk of the work.
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