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https://issues.apache.org/jira/browse/CASSANDRA-2975?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Vijay updated CASSANDRA-2975:
-----------------------------
Attachment: 0001-CASSANDRA-2975.patch
Attached is the refactor which includes fixes as per the suggestions. Added a
factory to make adding newer hashesh easier but left the Legacy alone but it
will be fairly trivial and more cleaner if we want to refactor a little more.
Let me know thanks! Tests passed and the long test shows significant
improvement Thanks Brian!
> 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: Vijay
> Priority: Trivial
> Labels: lhf
> Fix For: 1.2
>
> Attachments: 0001-CASSANDRA-2975.patch,
> 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.
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