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From "Brandon Williams (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (CASSANDRA-4303) Compressed bloomfilters
Date Fri, 01 Jun 2012 16:22:23 GMT

    [ https://issues.apache.org/jira/browse/CASSANDRA-4303?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13287512#comment-13287512
] 

Brandon Williams commented on CASSANDRA-4303:
---------------------------------------------

bq. Would simply reducing the FP default be a Good Enough solution?

I guess if we're still state-of-the-art here that's not a bad solution for new CFs.  Our default
is really worst-case scenario, though we do have people relying on that.
                
> Compressed bloomfilters
> -----------------------
>
>                 Key: CASSANDRA-4303
>                 URL: https://issues.apache.org/jira/browse/CASSANDRA-4303
>             Project: Cassandra
>          Issue Type: Improvement
>            Reporter: Brandon Williams
>             Fix For: 1.2
>
>
> Very commonly, people encountering an OOM need to increase their bloom filter false positive
ratio to reduce memory pressure, since BFs tend to be the largest shareholder.  It would make
sense if we could alleviate the memory pressure from BFs with compression while maintaining
the FP ratio (at the cost of a bit of cpu) that some users have come to expect.  One possible
implementation is at http://code.google.com/p/javaewah/

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