[jira] [Comment Edited] (CASSANDRA-21500) Flaky test: AccordCQLTestBase#testCASSimulatorLite

["Benedict Elliott Smith (Jira)" <ji...@apache.org>]

    [ https://issues.apache.org/jira/browse/CASSANDRA-21500?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=18095422#comment-18095422 ] 

Benedict Elliott Smith edited comment on CASSANDRA-21500 at 7/10/26 9:06 PM:
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I think I already have a fix for this pending (in a larger patch I haven't completed yet)


was (Author: benedict):
I think I already have a fix for this pending

> 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
>            Assignee: Benedict Elliott Smith
>            Priority: Normal
>
> {{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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