[jira] [Issue Comment Edited] (CASSANDRA-3772) Evaluate Murmur3-based partitioner

["Dave Brosius (Issue Comment Edited) (JIRA)" <ji...@apache.org>]

    [ https://issues.apache.org/jira/browse/CASSANDRA-3772?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13199516#comment-13199516 ] 

Dave Brosius edited comment on CASSANDRA-3772 at 2/3/12 4:56 AM:
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Doing 1000 inserts of a 5 column CF on a single node cluster on a really lousy machine seems to show that the guava murmur hash is significantly slower than MD5. 5x? perhaps. Perhaps it's just the guava implementation, as opposed to the Murmur3 algorithm.
                
      was (Author: dbrosius@apache.org):
    Doing 1000 inserts of a 5 column CF on a single node cluster on a really lousy machine seems to show that the guava murmur hash is significantly slower than MD5. 5x? perhaps. Perhaps it's just the guava implementation, as opposed to the Murmur3 implementation.
                  
> 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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