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https://issues.apache.org/jira/browse/HADOOP-960?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel#action_12468721
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Andrew McNabb commented on HADOOP-960:
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It's "usually" better to take the extra maps. Unfortunately, I've got one of
those ones where it isn't better. :)
I guess this is really a feature request for an InputFormat that puts together
all of the files in a directory and splits them evenly.
> Incorrect number of map tasks when there are multiple input files
> -----------------------------------------------------------------
>
> Key: HADOOP-960
> URL: https://issues.apache.org/jira/browse/HADOOP-960
> Project: Hadoop
> Issue Type: Bug
> Affects Versions: 0.10.1
> Reporter: Andrew McNabb
>
> This problem happens with hadoop-streaming and possibly elsewhere. If there
> are 5 input files, it will create 130 map tasks, even if
> mapred.map.tasks=128. The number of map tasks is incorrectly set to a
> multiple of the number of files. (I wrote a much more complete bug report,
> but Jira lost it when it had an error, so I'm not in the mood to write it all
> again)
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