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Posted to commits@cassandra.apache.org by "C. Scott Andreas (JIRA)" <ji...@apache.org> on 2018/11/18 18:28:01 UTC

[jira] [Updated] (CASSANDRA-6633) Dynamic Resize of Bloom Filters

     [ https://issues.apache.org/jira/browse/CASSANDRA-6633?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

C. Scott Andreas updated CASSANDRA-6633:
----------------------------------------
    Component/s: Core

> Dynamic Resize of Bloom Filters
> -------------------------------
>
>                 Key: CASSANDRA-6633
>                 URL: https://issues.apache.org/jira/browse/CASSANDRA-6633
>             Project: Cassandra
>          Issue Type: Improvement
>          Components: Core
>            Reporter: Benedict
>            Priority: Minor
>              Labels: performance
>             Fix For: 4.x
>
>
> Dynamic resizing would be useful. The simplest way to achieve this is to have separate address spaces for each hash function, so that we may increase/decrease accuracy by simply loading/unloading another function (we could even do interesting stuff in future like alternating the functions we select if we find we're getting more false positives than should be expected);
> Faster loading/unloading would help this, and we could achieve this by mmapping the bloom filter representation on systems that we can mlock.



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