patch is from http://issues.apache.org/jira/browse/MAPREDUCE-375
originally targeted to 0.21.0, but modified to work with 0.20.1 (mostly resolving directory changes made in 0.21.0)
svn co http://svn.apache.org/repos/asf/hadoop/common/tags/release-0.20.1/ hadoop-0.20.1-src
cd hadoop-0.20.1-src
patch -p0 -i /zoom/libraries/apache/hadoop/patch-375-2.txt
there should be one rejection on NLineInputFormat in mapred
take a look at the rejection file, it should be fairly strait forward applying the change.
the rejection is caused by a small inconsistency between the NLineInputFormat in the two versions
it looks like a small bug fix in 0.21.0 not not in 0.20.1... should be fine as the patch just
dumps the code in the method and delegates to the mapreduce NLineInputFormat.
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