Better access to the RecordReader
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Key: HADOOP-433
URL: http://issues.apache.org/jira/browse/HADOOP-433
Project: Hadoop
Issue Type: Improvement
Components: mapred
Affects Versions: 0.5.0
Reporter: Benjamin Reed
Priority: Minor
The record reader has access to the FileSplit which can in turn have
information that is useful to the Mapper. For example, Map processing may vary
according to file name or attributes associated with a file. Unfortunately,
even using a MapRunner you only have access to the progress wrapper of the
RecordReader. To get access to the real record reader I had to use a thread
local variable which I set in RecordReader.getNext(). It would be much nicer if
you could get a reference to the real RecordReader from the RecordReader passed
to MapRunner.
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