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https://issues.apache.org/jira/browse/HADOOP-8503?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Yang Yang updated HADOOP-8503:
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Attachment: 0001-HADOOP-8503-re-enable-mapreduces.job.maps.patch
here is a patch to use the new mapreduce.job.maps config param
it's the same spirit as the old mapred.map.tasks
I have not tested this since the github source I pulled does not build . Harsh
could you please try this?
Thanks
Yang
> logic difference between old mapred.FileInputFormat and
> mapreduce.lib.input.FileInputFormat
> -------------------------------------------------------------------------------------------
>
> Key: HADOOP-8503
> URL: https://issues.apache.org/jira/browse/HADOOP-8503
> Project: Hadoop Common
> Issue Type: Bug
> Affects Versions: 0.20.0
> Reporter: Yang Yang
> Priority: Minor
> Attachments: 0001-HADOOP-8503-re-enable-mapreduces.job.maps.patch
>
>
> in the old mapred.FileInputFormat.getSplits(JobConf, int)
> long splitSize = computeSplitSize(goalSize, minSize, blockSize);
> so we could control splitSize with the goalSize, which is controlled by
> mapred.map.tasks
> in the new code, mapreduces.lib.input.FileInputFormat
> long splitSize = computeSplitSize(blockSize, minSize, maxSize);
> i.e. we don't have goal size anymore, furthermore,
> the implementation of computeSplitSize() no longer makes sense:
> return Math.max(minSize, Math.min(maxSize, blockSize));
> since we assume that maxSize is always bigger than minSize, the above line is
> equivalent to just
> return Math.min(maxSize, blockSize), so minSize is useless
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