Gabriel Reid created CRUNCH-72:
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Summary: Cartesian#cross loads all data in memory per parallel
mapper
Key: CRUNCH-72
URL: https://issues.apache.org/jira/browse/CRUNCH-72
Project: Crunch
Issue Type: Bug
Reporter: Gabriel Reid
Assignee: Gabriel Reid
Cartesian#cross currently uses the PTable#cogroup method to join two sets of
data together; this results in all data from both sides of the join being
loaded in memory at one time. This can be a real problem with cartesian joins
because of the quantity of data being joined.
Using PTable#join instead of PTable#cogroup will reduce the memory usage by
50%, which can be the difference between a cartesian join working or failing
with an OOME.
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