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From "Jonathan Ellis (Commented) (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (CASSANDRA-3497) BloomFilter FP ratio should be configurable or size-restricted some other way
Date Wed, 04 Jan 2012 14:47:39 GMT

    [ https://issues.apache.org/jira/browse/CASSANDRA-3497?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13179525#comment-13179525
] 

Jonathan Ellis commented on CASSANDRA-3497:
-------------------------------------------

bq. the fix patch (0001-give-default-val-to-fp_chance.patch) works for the 1.1 branch but
not for 1.0

it's already applied to both.  (Note that we've switched to git, the old svn repo is no longer
maintained.)
                
> BloomFilter FP ratio should be configurable or size-restricted some other way
> -----------------------------------------------------------------------------
>
>                 Key: CASSANDRA-3497
>                 URL: https://issues.apache.org/jira/browse/CASSANDRA-3497
>             Project: Cassandra
>          Issue Type: New Feature
>          Components: Core
>            Reporter: Brandon Williams
>            Assignee: Yuki Morishita
>            Priority: Minor
>             Fix For: 1.0.7
>
>         Attachments: 0001-give-default-val-to-fp_chance.patch, 3497-v3.txt, 3497-v4.txt,
CASSANDRA-1.0-3497.txt
>
>
> When you have a live dc and purely analytical dc, in many situations you can have less
nodes on the analytical side, but end up getting restricted by having the BloomFilters in-memory,
even though you have absolutely no use for them.  It would be nice if you could reduce this
memory requirement by tuning the desired FP ratio, or even just disabling them altogether.

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