Sam Tunnicliffe created CASSANDRA-21456:
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Summary: 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
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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