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https://issues.apache.org/jira/browse/CASSANDRA-3497?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13175279#comment-13175279
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Yuki Morishita commented on CASSANDRA-3497:
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Jonathan,

Yours is what I first tried, but instead I tried to do it in SSTR, and I think 
that is what we can do best for 1.0.x.
One thing to point out is that it NPE when fpChance is null and try to convert 
it to double at SSTableWriter.java#403.

                
> 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: 3497-v3.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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