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https://issues.apache.org/jira/browse/MAPREDUCE-6864?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Junping Du updated MAPREDUCE-6864:
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Target Version/s: 2.8.3 (was: 2.8.1)
> Hadoop streaming creates 2 mappers when the input has only one block
> --------------------------------------------------------------------
>
> Key: MAPREDUCE-6864
> URL: https://issues.apache.org/jira/browse/MAPREDUCE-6864
> Project: Hadoop Map/Reduce
> Issue Type: Bug
> Components: mrv2
> Affects Versions: 2.7.3
> Reporter: Daniel Templeton
>
> If a streaming job is run against input that is less than 2 blocks, 2 mappers
> will be created, both operating on the same split, both producing (duplicate)
> output. In some cases the second mapper will consistently fail. I've not
> seen the failure with input less than 10 bytes or more than a couple MB. I
> have seen it with a 4kB input.
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