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Posted to mapreduce-issues@hadoop.apache.org by "Dave Beech (JIRA)" <ji...@apache.org> on 2013/07/04 15:03:47 UTC

[jira] [Created] (MAPREDUCE-5374) CombineFileRecordReader does not set "map.input.*" configuration parameters for first file read

Dave Beech created MAPREDUCE-5374:
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             Summary: 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


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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