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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 Thu, 22 Dec 2011 22:45:31 GMT

    [ https://issues.apache.org/jira/browse/CASSANDRA-3497?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13175123#comment-13175123
] 

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

Can we do it with a single setting?

fp_ratio = null: use current 15-buckets-per-element filters
fp_ratio = 0: no filter
fp_ratio > 0: BF based on given FP probability

Further, I think we should split this up so that for 1.0 we only worry about the null and
positive cases -- let's do a separate ticket for 1.1 about skipping the BF entirely.
                
> 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: 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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