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https://issues.apache.org/jira/browse/CRUNCH-215?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13679644#comment-13679644
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Gabriel Reid commented on CRUNCH-215:
-------------------------------------
Ok, got it, thanks for the explanation. In any case, the code for the toBytes
method is written now, so it should be a simple thing to move it to the PType
implementation classes. It would probably also be worth having optimized
versions for primitive values, instead of writing them to an Avro/Writable
first to get the bytes representation. But yeah, that's for another JIRA.
> 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
> Attachments: CRUNCH-215.patch
>
>
> 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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