[
https://issues.apache.org/jira/browse/CASSANDRA-2975?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]
David Allsopp updated CASSANDRA-2975:
-------------------------------------
Attachment: Murmur3Benchmark.java
It appears not! Benchmark is attached so folks can try it on other hardware (no
point if the advantage is specific to my particular machine!) Will post my
results below:
> Upgrade MurmurHash to version 3
> -------------------------------
>
> Key: CASSANDRA-2975
> URL: https://issues.apache.org/jira/browse/CASSANDRA-2975
> Project: Cassandra
> Issue Type: Improvement
> Components: Core
> Reporter: Brian Lindauer
> Assignee: Brian Lindauer
> Priority: Trivial
> Labels: lhf
> Fix For: 1.1
>
> Attachments:
> 0001-Convert-BloomFilter-to-use-MurmurHash-v3-instead-of-.patch,
> 0002-Backwards-compatibility-with-files-using-Murmur2-blo.patch,
> Murmur3Benchmark.java
>
>
> MurmurHash version 3 was finalized on June 3. It provides an enormous speedup
> and increased robustness over version 2, which is implemented in Cassandra.
> Information here:
> http://code.google.com/p/smhasher/
> The reference implementation is here:
> http://code.google.com/p/smhasher/source/browse/trunk/MurmurHash3.cpp?spec=svn136&r=136
> I have already done the work to port the (public domain) reference
> implementation to Java in the MurmurHash class and updated the BloomFilter
> class to use the new implementation:
> https://github.com/lindauer/cassandra/commit/cea6068a4a3e5d7d9509335394f9ef3350d37e93
> Apart from the faster hash time, the new version only requires one call to
> hash() rather than 2, since it returns 128 bits of hash instead of 64.
--
This message is automatically generated by JIRA.
If you think it was sent incorrectly, please contact your JIRA administrators:
https://issues.apache.org/jira/secure/ContactAdministrators!default.jspa
For more information on JIRA, see: http://www.atlassian.com/software/jira
