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https://issues.apache.org/jira/browse/MAPREDUCE-5374?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Dave Beech updated MAPREDUCE-5374:
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Attachment: MAPREDUCE-5374.patch
Here's a patch against trunk instead.
> CombineFileRecordReader does not set "map.input.*" configuration parameters
> for first file read
> -----------------------------------------------------------------------------------------------
>
> Key: MAPREDUCE-5374
> URL: https://issues.apache.org/jira/browse/MAPREDUCE-5374
> Project: Hadoop Map/Reduce
> Issue Type: Bug
> Affects Versions: 1.2.0
> Reporter: Dave Beech
> Assignee: Dave Beech
> Attachments: MAPREDUCE-5374.patch, MAPREDUCE-5374.patch
>
>
> The CombineFileRecordReader operates on splits consisting of multiple files.
> Each time a new record reader is initialised for a "chunk", certain
> parameters are supposed to be set on the configuration object
> (map.input.file, map.input.start and map.input.length)
> However, the first reader is initialised in a different way to subsequent
> ones (i.e. initialize is called by the MapTask directly rather than from
> inside the record reader class). Because of this, these config parameters are
> not set properly and are returned as null when you access them from inside a
> mapper.
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