[infinispan-dev] MurmurHash fixes

[david marion]

Manik,
 
  Being new here, I'm not totally sure of JBoss' stance on including other libraries. Hadoop has a Murmur2 hash implementation that I have been using at work for a while with no problems. Just a thought.
 
-- Dave Marion

 
> From: manik at jboss.org
> Date: Thu, 13 Jan 2011 19:35:44 +0000
> To: infinispan-dev at lists.jboss.org
> Subject: [infinispan-dev] MurmurHash fixes
> 
> Guys,
> 
> The MurmurHash2 impl we have in 4.2.0 is buggy in that my translation from the original C source was faulty and it effectively hashes over just 31 bits instead of 32. It means the distribution result isn't as good as it could be.
> 
> Now it isn't that easy for me to just *fix* this in 4.2.1, since it means keys mapped to nodes using 4.2.0 may not map to the same node in 4.2.1.
> 
> So here is what I propose:
> 
> 1) Fix it in 4.2.x as MurmurHash2A
> 2) Use MurmurHash2A by default, *unless* a config flag is provided that forces the use of MurmurHash2. (e.g., <hash function="MurmurHash2">)
> 
> This will even give us the ability to use MurmurHash3 in 5.0 when we have it.
> 
> WDYT?
> 
> Cheers
> Manik
> --
> Manik Surtani
> manik at jboss.org
> twitter.com/maniksurtani
> 
> Lead, Infinispan
> http://www.infinispan.org
> 
> 
> 
> 
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