C. Scott Andreas created CASSANDRA-21500:
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Summary: Flaky test: AccordCQLTestBase#testCASSimulatorLite
Key: CASSANDRA-21500
URL: https://issues.apache.org/jira/browse/CASSANDRA-21500
Project: Apache Cassandra
Issue Type: Bug
Components: Accord
Reporter: C. Scott Andreas
{{AccordCQLTestBase.testCASSimulatorLite}} fires N concurrent CAS ({{{}UPDATE
... IF EXISTS{}}}) at {{CL=ALL}} on a single key through Accord in a 2-node
cluster, then asserts the two appended columns stay in lockstep. The ten-way
contention produced in this test fails pretty often in CI with a
WriteTimeoutException.
Reducing the concurrency of this CAS test from 10 to 4 prevents this test from
flaking in CI.
Additional details and flakiness stats at varied levels of concurrency
(model-assisted): [https://github.com/cscotta/cassandra/pull/9]
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