Gabriel Reid created CRUNCH-215:
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             Summary: Add BloomFilterJoinStrategy
                 Key: CRUNCH-215
                 URL: https://issues.apache.org/jira/browse/CRUNCH-215
             Project: Crunch
          Issue Type: New Feature
            Reporter: Gabriel Reid
            Assignee: Gabriel Reid


Bloom filters can be very effective for pre-filtering one side of a join when 
one side of the join has a small subset of the keys of the other side (i.e. 
there are many keys on one side that will not be joined).

The Bloom filter can be built up based on the keys of one side of the join (the 
side with fewer keys), and then can be applied as a filter to the other side of 
the join before it is sent through the shuffle and reduce phases.

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