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https://issues.apache.org/jira/browse/CASSANDRA-3772?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13207132#comment-13207132
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Yuki Morishita commented on CASSANDRA-3772:
-------------------------------------------
Dave,
Patch needs rebase, but looking at the patch, I noticed the following:
{code}
private static byte[] hashMurmur3(ByteBuffer... data)
{
HashFunction hashFunction = murmur3HF.get();
Hasher hasher = hashFunction.newHasher();
// snip
}
{code}
Isn't that slow if you instantiate every time? I looked up guava source code
but I saw no way to "reset", so I guess the above is the only thing you could
do...
I also note that CASSANDRA-2975 will implement MurmurHash3, so I think it is
better not to introduce external library. What do you think?
> Evaluate Murmur3-based partitioner
> ----------------------------------
>
> Key: CASSANDRA-3772
> URL: https://issues.apache.org/jira/browse/CASSANDRA-3772
> Project: Cassandra
> Issue Type: New Feature
> Components: Core
> Reporter: Jonathan Ellis
> Assignee: Dave Brosius
> Fix For: 1.2
>
> Attachments: try_murmur3.diff
>
>
> MD5 is a relatively heavyweight hash to use when we don't need cryptographic
> qualities, just a good output distribution. Let's see how much overhead we
> can save by using Murmur3 instead.
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