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https://issues.apache.org/jira/browse/CASSANDRA-3772?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13199679#comment-13199679
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Jonathan Ellis commented on CASSANDRA-3772:
-------------------------------------------

Hmm.  You probably need to run at least 10k inserts through it first to make 
sure the JIT is warm, before timing things.  Otherwise I would expect the 
(calling out to C) MD5 code to do better than (interpreted) Murmur3.
                
> Evaluate Murmur3-based partitioner
> ----------------------------------
>
>                 Key: CASSANDRA-3772
>                 URL: https://issues.apache.org/jira/browse/CASSANDRA-3772
>             Project: Cassandra
>          Issue Type: New Feature
>            Reporter: Jonathan Ellis
>             Fix For: 1.2
>
>         Attachments: try_murmur3.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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