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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