crunch-dev mailing list archives

Site index · List index
Message view « Date » · « Thread »
Top « Date » · « Thread »
From "Gabriel Reid (JIRA)" <j...@apache.org>
Subject [jira] [Updated] (CRUNCH-215) Add BloomFilterJoinStrategy
Date Sun, 09 Jun 2013 22:02:20 GMT

     [ 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.

--
This message is automatically generated by JIRA.
If you think it was sent incorrectly, please contact your JIRA administrators
For more information on JIRA, see: http://www.atlassian.com/software/jira

Mime
View raw message