Ekaterina Dimitrova created CASSANDRA-19127:
-----------------------------------------------

             Summary: Test Failure: 
org.apache.cassandra.simulator.test.ShortPaxosSimulationTest.simulationTest
                 Key: CASSANDRA-19127
                 URL: https://issues.apache.org/jira/browse/CASSANDRA-19127
             Project: Cassandra
          Issue Type: Bug
            Reporter: Ekaterina Dimitrova


The test is not flaky on 5.0 - 
https://app.circleci.com/pipelines/github/ekaterinadimitrova2/cassandra/2590/workflows/47dedf52-87fd-4178-bc89-d179e58b6562
But it is significantly flaky on trunk - 
https://app.circleci.com/pipelines/github/ekaterinadimitrova2/cassandra/2591/workflows/1150aab2-4961-4fe3-a126-b96356fdb939/jobs/49867/tests
{code:java}
org.apache.cassandra.simulator.SimulationException: Failed on seed 
0xf2b8eff98afd45dd
        Suppressed: java.lang.RuntimeException: 
java.util.concurrent.TimeoutException
                at 
org.apache.cassandra.utils.Throwables.maybeFail(Throwables.java:79)
                at 
org.apache.cassandra.utils.FBUtilities.waitOnFutures(FBUtilities.java:537)
                at 
org.apache.cassandra.distributed.impl.AbstractCluster.close(AbstractCluster.java:1098)
                at 
org.apache.cassandra.simulator.ClusterSimulation.close(ClusterSimulation.java:854)
                at 
org.apache.cassandra.simulator.SimulationRunner$Run.run(SimulationRunner.java:361)
                at 
org.apache.cassandra.simulator.SimulationRunner$BasicCommand.run(SimulationRunner.java:346)
                at 
org.apache.cassandra.simulator.paxos.PaxosSimulationRunner$Run.run(PaxosSimulationRunner.java:34)
                at 
org.apache.cassandra.simulator.paxos.PaxosSimulationRunner.main(PaxosSimulationRunner.java:148)
                at 
org.apache.cassandra.simulator.test.ShortPaxosSimulationTest.simulationTest(ShortPaxosSimulationTest.java:101)
                at 
java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
                at 
java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
                at 
java.base/jdk.internal.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
        Caused by: java.util.concurrent.TimeoutException
                at 
org.apache.cassandra.utils.concurrent.AbstractFuture.get(AbstractFuture.java:253)
                at 
org.apache.cassandra.utils.FBUtilities.waitOnFutures(FBUtilities.java:529)
                Suppressed: java.util.concurrent.TimeoutException
                Suppressed: java.util.concurrent.TimeoutException
                Suppressed: java.util.concurrent.TimeoutException
                Suppressed: java.util.concurrent.TimeoutException
                Suppressed: java.util.concurrent.TimeoutException
Caused by: java.lang.NullPointerException
        at 
org.apache.cassandra.simulator.cluster.KeyspaceActions.scheduleAndUpdateTopologyOnCompletion(KeyspaceActions.java:352)
        at 
org.apache.cassandra.simulator.cluster.KeyspaceActions.next(KeyspaceActions.java:291)
        at org.apache.cassandra.simulator.Actions.next(Actions.java:147)
        at 
org.apache.cassandra.simulator.Actions.lambda$streamNextSupplier$3(Actions.java:156)
        at 
org.apache.cassandra.simulator.Actions$LambdaAction.performSimple(Actions.java:63)
        at 
org.apache.cassandra.simulator.Action.performAndRegister(Action.java:468)
        at org.apache.cassandra.simulator.Action.perform(Action.java:486)
        at 
org.apache.cassandra.simulator.ActionSchedule.next(ActionSchedule.java:379)
        at 
org.apache.cassandra.simulator.paxos.PaxosSimulation$2.next(PaxosSimulation.java:217)
        at 
org.apache.cassandra.simulator.paxos.PaxosSimulation.run(PaxosSimulation.java:189)
        at 
org.apache.cassandra.simulator.paxos.PairOfSequencesPaxosSimulation.run(PairOfSequencesPaxosSimulation.java:351)
        at 
org.apache.cassandra.simulator.SimulationRunner$Run.run(SimulationRunner.java:365)
        at 
org.apache.cassandra.simulator.SimulationRunner$BasicCommand.run(SimulationRunner.java:346)
        at 
org.apache.cassandra.simulator.paxos.PaxosSimulationRunner$Run.run(PaxosSimulationRunner.java:34)
        at 
org.apache.cassandra.simulator.paxos.PaxosSimulationRunner.main(PaxosSimulationRunner.java:148)
        at 
org.apache.cassandra.simulator.test.ShortPaxosSimulationTest.simulationTest(ShortPaxosSimulationTest.java:101)
        at 
java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
        at 
java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
        at 
java.base/jdk.internal.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
{code}




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