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From "Jonathan Ellis (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (CASSANDRA-4303) Compressed bloomfilters
Date Fri, 01 Jun 2012 02:53:23 GMT

    [ https://issues.apache.org/jira/browse/CASSANDRA-4303?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13287110#comment-13287110
] 

Jonathan Ellis commented on CASSANDRA-4303:
-------------------------------------------

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