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https://issues.apache.org/jira/browse/HADOOP-960?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel#action_12468726
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Doug Cutting 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. :)
Then subclass your InputFormat and override the getSplits() method.
> This is now a feature request instead of a bug.
The feature's there: you can precisely control splitting if you like. E.g.,
Nutch does this when crawling. Is that not sufficient for you?
> 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: Wish
> 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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