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Posted to dev@crunch.apache.org by "Gabriel Reid (JIRA)" <ji...@apache.org> on 2013/06/10 00:02:20 UTC

[jira] [Updated] (CRUNCH-215) Add BloomFilterJoinStrategy

     [ https://issues.apache.org/jira/browse/CRUNCH-215?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Gabriel Reid updated CRUNCH-215:
--------------------------------

    Attachment: CRUNCH-215.patch

Patch to introduce BloomFilterJoinStrategy
                
> 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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