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From "stack (JIRA)" <j...@apache.org>
Subject [jira] Resolved: (HBASE-875) Use MurmurHash instead of JenkinsHash
Date Tue, 23 Sep 2008 18:11:44 GMT

     [ https://issues.apache.org/jira/browse/HBASE-875?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

stack resolved HBASE-875.
-------------------------

       Resolution: Fixed
    Fix Version/s: 0.19.0

You are right on the first value being count of hashes; my misreading.

Committed to TRUNK.  Thanks for the patch Andrzej.

> Use MurmurHash instead of JenkinsHash
> -------------------------------------
>
>                 Key: HBASE-875
>                 URL: https://issues.apache.org/jira/browse/HBASE-875
>             Project: Hadoop HBase
>          Issue Type: Improvement
>          Components: util
>    Affects Versions: 0.19.0
>            Reporter: Andrzej Bialecki 
>             Fix For: 0.19.0
>
>         Attachments: murmur.patch
>
>
> I recently ported the MurmurHash (http://murmurhash.googlepages.com/) to Java, and according
to my tests it's roughly 5 times faster than the current version of JenkinsHash in the trunk/
. According to the author (and other analysts at comp.sci.crypt) this hash has an excellent
avalanche behavior, and low collision rate. I propose to either replace the JenkinsHash or
add this hash as an option to be used in BloomFilter-s and related classes.
> If your opinion is positive, I'll prepare a patch. The Java implementation of the hash
can be found here: http://www.getopt.org/murmur/MurmurHash.java

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