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From "Grant Ingersoll (Commented) (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (MAHOUT-862) MurmurHash 3.0
Date Wed, 02 Nov 2011 14:59:32 GMT

    [ https://issues.apache.org/jira/browse/MAHOUT-862?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13142199#comment-13142199
] 

Grant Ingersoll commented on MAHOUT-862:
----------------------------------------

I accidentally committed this when making a minor change to build-reuters.sh.  Rather than
rollback, I'm going to let it stick and others can simply patch what I put in, as it is new
functionality that doesn't change the old functionality.
                
> MurmurHash 3.0
> --------------
>
>                 Key: MAHOUT-862
>                 URL: https://issues.apache.org/jira/browse/MAHOUT-862
>             Project: Mahout
>          Issue Type: Improvement
>            Reporter: Grant Ingersoll
>            Assignee: Grant Ingersoll
>            Priority: Minor
>         Attachments: MAHOUT-862.patch
>
>
> Yonik has ported an implementation of MurmurHash 3.0 and put it in the public domain:
http://www.lucidimagination.com/blog/2011/09/15/murmurhash3-for-java/
> It's a port of https://sites.google.com/site/murmurhash/ which says: 
> {quote}
> (I reserve the right to tweak the constants after people have had a chance to bang on
it). Murmur3 has better performance than MurmurHash2, no repetition flaw, comes in 32/64/128-bit
versions for both x86 and x64 platforms, and the 128-bit x64 version is blazing fast - over
5 gigabytes per second on my 3 gigahertz Core 2.
> In addition, the library of test code that I use to test MurmurHash (called SMHasher)
has been released - it's still rough (and will only compile under VC++ at the moment), but
it contains everything needed to verify hash functions of arbitrary output bit-lengths.
> Murmur3 and all future versions will be hosted on Google Code here - http://code.google.com/p/smhasher/
- you can access the codebase via the 'Source' tab at the top.
> {quote}
> See also http://code.google.com/p/smhasher/
> We should add support for it and hook into MinHash

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