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https://issues.apache.org/jira/browse/CASSANDRA-12777?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15572934#comment-15572934
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Dikang Gu edited comment on CASSANDRA-12777 at 10/13/16 9:51 PM:
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It's not perfect yet, but I'd like to send it out to let people take a look
first:
https://github.com/DikangGu/cassandra/commit/3711f9c00f47ddddaba768ceba70fd9bd54f1d64
Currently it supports Murmur3Partitioner and RandomPartitioner. [~blambov] do
you mind to take a look?
I will continue to clean it up.
Thanks!
was (Author: dikanggu):
It's not perfect yet, but I'd like to send it out to let people take a look
first:
https://github.com/DikangGu/cassandra/commit/404e7238dfe6c5147e9681093572aad4e6aa779d
Currently it supports Murmur3Partitioner and RandomPartitioner. [~blambov] do
you mind to take a look?
I will continue to clean it up.
Thanks!
> Optimize the vnode allocation for single replica per DC
> -------------------------------------------------------
>
> Key: CASSANDRA-12777
> URL: https://issues.apache.org/jira/browse/CASSANDRA-12777
> Project: Cassandra
> Issue Type: Improvement
> Reporter: Dikang Gu
> Assignee: Dikang Gu
> Fix For: 3.x
>
>
> The new vnode allocation algorithm introduced in CASSANDRA-7032 is optimized
> for the situation that there are multiple replicas per DC.
> In our production environment, most cluster only has one replica, in this
> case, the algorithm does not work perfectly. It always tries to split token
> ranges by half, so that the ownership of "min" node could go as low as ~60%
> compared to avg.
> So for single replica case, I'm working on a new algorithm, which is based on
> Branimir's previous commit, to split token ranges by "some" percentage,
> instead of always by half. In this way, we can get a very small variation of
> the ownership among different nodes.
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