Andres de la Peña created CASSANDRA-18944:
---------------------------------------------

             Summary: Test failure: 
org.apache.cassandra.simulator.test.ShortPaxosSimulationTest.simulationTest
                 Key: CASSANDRA-18944
                 URL: https://issues.apache.org/jira/browse/CASSANDRA-18944
             Project: Cassandra
          Issue Type: Bug
          Components: Test/unit
            Reporter: Andres de la Peña


The simulator test 
{{org.apache.cassandra.simulator.test.ShortPaxosSimulationTest#simulationTest}} 
is flaky on 5.0 and trunk:
* 
https://app.circleci.com/pipelines/github/mike-tr-adamson/cassandra/332/workflows/946e28f4-2dec-4384-ac38-de011093f6c6/jobs/25735/tests
* 
https://app.circleci.com/pipelines/github/adelapena/cassandra/3253/workflows/e48b49e9-cf36-412a-a811-d813031e6f01/jobs/83735/tests
* 
https://app.circleci.com/pipelines/github/adelapena/cassandra/3254/workflows/69f451ef-fb39-48e4-b1d1-40ee4141b0c1/jobs/83739/tests

{code}
org.apache.cassandra.simulator.SimulationException: Failed on seed 
0xb01206bb3b021127
Caused by: java.lang.ClassCastException: class 
org.apache.cassandra.net.NoPayload cannot be cast to class 
org.apache.cassandra.gms.GossipShutdown (org.apache.cassandra.net.NoPayload and 
org.apache.cassandra.gms.GossipShutdown are in unnamed module of loader 
org.apache.cassandra.distributed.shared.InstanceClassLoader @68801feb)
        at 
org.apache.cassandra.gms.GossipShutdown$Serializer.serialize(GossipShutdown.java:41)
        at 
org.apache.cassandra.net.Message$Serializer.serialize(Message.java:722)
        at 
org.apache.cassandra.distributed.impl.Instance.serializeMessage(Instance.java:427)
        at 
org.apache.cassandra.distributed.impl.Instance.lambda$registerOutboundFilter$5(Instance.java:370)
        at 
org.apache.cassandra.net.OutboundSink$Filtered.accept(OutboundSink.java:54)
        at org.apache.cassandra.net.OutboundSink.accept(OutboundSink.java:70)
        at 
org.apache.cassandra.net.MessagingService.send(MessagingService.java:449)
        at 
org.apache.cassandra.net.MessagingService.send(MessagingService.java:419)
        at 
org.apache.cassandra.gms.Gossiper.unsafeSendShutdown(Gossiper.java:2634)
        at 
org.apache.cassandra.simulator.cluster.OnInstanceSendShutdown.lambda$invokableSendShutdown$1(OnInstanceSendShutdown.java:48)
        at org.apache.cassandra.concurrent.FutureTask$1.call(FutureTask.java:96)
        at org.apache.cassandra.concurrent.FutureTask.call(FutureTask.java:61)
        at org.apache.cassandra.concurrent.FutureTask.run(FutureTask.java:71)
        at org.apache.cassandra.concurrent.FutureTask$1.call(FutureTask.java:96)
        at 
org.apache.cassandra.concurrent.SyncFutureTask$1.call(SyncFutureTask.java:46)
        at 
org.apache.cassandra.concurrent.SyncFutureTask.run(SyncFutureTask.java:68)
        at 
org.apache.cassandra.simulator.systems.InterceptingExecutor$AbstractSingleThreadedExecutorPlus.lambda$new$0(InterceptingExecutor.java:584)
        at 
io.netty.util.concurrent.FastThreadLocalRunnable.run(FastThreadLocalRunnable.java:30)
        at java.base/java.lang.Thread.run(Thread.java:829)
{code}
The test failure can easily be reproduced on CircleCI with:
{code}
.circleci/generate.sh -sp \
  -e 
REPEATED_SIMULATOR_DTESTS=org.apache.cassandra.simulator.test.ShortPaxosSimulationTest
 \
  -e REPEATED_SIMULATOR_DTESTS_COUNT=100
{code}
Flakiness seems ~18%.

The test failure is not reported on Butler because simulator tests are not run 
by Jenkins.



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