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https://issues.apache.org/jira/browse/CASSANDRA-21456?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=18089686#comment-18089686
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Sam Tunnicliffe edited comment on CASSANDRA-21456 at 6/17/26 5:03 PM:
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I've combined the patches for CASSANDRA-21454, CASSANDRA-21455 &
CASSANDRA-21456 and am running CI against that
[branch|https://github.com/beobal/cassandra/tree/21454_21455_21456].
was (Author: beobal):
I've combined the patches for CASSANDRA-21454, CASSANDRA-21455 &
CASSANDRA-21456 and am running CI against that branch.
> Add policy for selecting CMS host when submitting commit request
> ----------------------------------------------------------------
>
> Key: CASSANDRA-21456
> URL: https://issues.apache.org/jira/browse/CASSANDRA-21456
> Project: Apache Cassandra
> Issue Type: Improvement
> Components: Transactional Cluster Metadata
> Reporter: Sam Tunnicliffe
> Assignee: Jon Meredith
> Priority: Normal
> Fix For: 6.x
>
> Attachments: ci_summary.html, result_details.tar.gz
>
>
> While running experiments on clusters with 1000+ nodes and multiple
> concurrent range movements, we found a lot of paxos contention on the CMS
> instances. Which CMS member an instance submits requests to is currently
> selected at random, causing the contention and ultimately leading to write
> timeout failures.
> One option is the addition of a policy setting to choose between random and
> deterministic CMS member selection and whether to prefer the local DC for
> changes or select globally.
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