airawat

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**Gist
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This gist details how to inner join two large datasets on the map-side, leveraging the join capability 
in mapreduce.  Such a join makes sense if both input datasets are too large to qualify for distribution 
through distributedcache, and can be implemented if both input datasets can be joined by the join key 
and both input datasets are sorted in the same order, by the join key.
 
There are two critical pieces to engaging the join behavior: