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From "Dave Brosius (Commented) (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (CASSANDRA-3772) Evaluate Murmur3-based partitioner
Date Sat, 24 Mar 2012 05:31:26 GMT

    [ https://issues.apache.org/jira/browse/CASSANDRA-3772?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13237446#comment-13237446
] 

Dave Brosius commented on CASSANDRA-3772:
-----------------------------------------

new patch against trunk using MurmurHash.hash3_x64_128.

Preliminary testing show murmur3 hash to be marginally faster than md5, altho not significantly.
(this is one very pedestrian hardware tho, so that might mask differences). Running longer
tests now to see if jit has had a fair chance to do it's magic.
                
> Evaluate Murmur3-based partitioner
> ----------------------------------
>
>                 Key: CASSANDRA-3772
>                 URL: https://issues.apache.org/jira/browse/CASSANDRA-3772
>             Project: Cassandra
>          Issue Type: New Feature
>          Components: Core
>            Reporter: Jonathan Ellis
>            Assignee: Dave Brosius
>             Fix For: 1.2
>
>         Attachments: try_murmur3.diff, try_murmur3_2.diff
>
>
> MD5 is a relatively heavyweight hash to use when we don't need cryptographic qualities,
just a good output distribution.  Let's see how much overhead we can save by using Murmur3
instead.

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