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Date: Tue, 27 Dec 2011 18:40:30 +0000 (UTC)
From: "Yuki Morishita (Updated) (JIRA)" <jira@apache.org>
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Subject: [jira] [Updated] (CASSANDRA-3497) BloomFilter FP ratio should be
 configurable or size-restricted some other way
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     [ https://issues.apache.org/jira/browse/CASSANDRA-3497?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Yuki Morishita updated CASSANDRA-3497:
--------------------------------------

    Attachment: 0001-give-default-val-to-fp_chance.patch

Radim,

Thanks for the report. The problem is that the new bloom_filter_fp_chance in avro interface definition does not have proper default.
I attached the patch to fix it.
                
> 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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