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From "Branimir Lambov (JIRA)" <j...@apache.org>
Subject [jira] [Updated] (CASSANDRA-7096) Evaluate murmur hash of token only once
Date Wed, 18 Feb 2015 16:19:12 GMT

     [ https://issues.apache.org/jira/browse/CASSANDRA-7096?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Branimir Lambov updated CASSANDRA-7096:
---------------------------------------
    Attachment: 7096.patch

Rebased patch attached, comparison [here|https://github.com/blambov/cassandra/compare/7096-cache-hash-rebased].

> Evaluate murmur hash of token only once
> ---------------------------------------
>
>                 Key: CASSANDRA-7096
>                 URL: https://issues.apache.org/jira/browse/CASSANDRA-7096
>             Project: Cassandra
>          Issue Type: Improvement
>          Components: Core
>            Reporter: Benedict
>            Assignee: Branimir Lambov
>            Priority: Minor
>              Labels: performance
>             Fix For: 3.0
>
>         Attachments: 7096.patch
>
>
> Every bloom filter lookup we perform recalculates the murmur hash for the token. I propose
we extend DecoratedKey for the purposes of reads only, and attach the full murmur hash to
it so that we can pass these directly to the bloom filter.



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