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https://issues.apache.org/jira/browse/CRUNCH-72?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Gabriel Reid resolved CRUNCH-72.
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Resolution: Fixed
Fix Version/s: 0.4.0
Committed to master
> 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
> Fix For: 0.4.0
>
>
> 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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