Session_With_Host_Changing_Distance is flaky

[dkropachev]

[2025-09-15T12:57:32.330Z]   Failed Session_With_Host_Changing_Distance [14 s]
[2025-09-15T12:57:32.330Z]   Error Message:
[2025-09-15T12:57:32.330Z]      pool2 != 3
[2025-09-15T12:57:32.330Z]   Expected: 3
[2025-09-15T12:57:32.330Z]   But was:  0
[2025-09-15T12:57:32.330Z] 
[2025-09-15T12:57:32.330Z]   Stack Trace:
[2025-09-15T12:57:32.330Z]      at Cassandra.Tests.TestHelper.RetryAssertAsync(Func`1 func, Int32 msPerRetry, Int32 maxRetries) in /jenkins/workspace/scylla-2025.2/driver-tests/csharp-driver-matrix-test/csharp-driver-datastax/src/Cassandra.Tests/TestHelper.cs:line 656
[2025-09-15T12:57:32.330Z]    at Cassandra.Tests.TestHelper.RetryAssert(Action act, Int32 msPerRetry, Int32 maxRetries) in /jenkins/workspace/scylla-2025.2/driver-tests/csharp-driver-matrix-test/csharp-driver-datastax/src/Cassandra.Tests/TestHelper.cs:line 620
[2025-09-15T12:57:32.330Z]    at Cassandra.IntegrationTests.Core.SessionTests.Session_With_Host_Changing_Distance() in /jenkins/workspace/scylla-2025.2/driver-tests/csharp-driver-matrix-test/csharp-driver-datastax/src/Cassandra.IntegrationTests/Core/SessionTests.cs:line 283
[2025-09-15T12:57:32.330Z]    at NUnit.Framework.Internal.TaskAwaitAdapter.GenericAdapter`1.BlockUntilCompleted()
[2025-09-15T12:57:32.331Z]    at NUnit.Framework.Internal.MessagePumpStrategy.NoMessagePumpStrategy.WaitForCompletion(AwaitAdapter awaiter)
[2025-09-15T12:57:32.331Z]    at NUnit.Framework.Internal.AsyncToSyncAdapter.Await(Func`1 invoke)
[2025-09-15T12:57:32.331Z]    at NUnit.Framework.Internal.Commands.TestMethodCommand.RunTestMethod(TestExecutionContext context)
[2025-09-15T12:57:32.331Z]    at NUnit.Framework.Internal.Commands.TestMethodCommand.Execute(TestExecutionContext context)
[2025-09-15T12:57:32.331Z]    at NUnit.Framework.Internal.Commands.BeforeAndAfterTestCommand.<>c__DisplayClass1_0.<Execute>b__0()
[2025-09-15T12:57:32.331Z]    at NUnit.Framework.Internal.Commands.DelegatingTestCommand.RunTestMethodInThreadAbortSafeZone(TestExecutionContext context, Action action)

[dkropachev]

On matrix tests it fails pretty consistently:

at Cassandra.Tests.TestHelper.RetryAssertAsync(Func`1 func, Int32 msPerRetry, Int32 maxRetries) in /jenkins/workspace/scylla-master/driver-tests/csharp-driver-matrix-test/csharp-driver-datastax/src/Cassandra.Tests/TestHelper.cs:line 656
   at Cassandra.Tests.TestHelper.RetryAssert(Action act, Int32 msPerRetry, Int32 maxRetries) in /jenkins/workspace/scylla-master/driver-tests/csharp-driver-matrix-test/csharp-driver-datastax/src/Cassandra.Tests/TestHelper.cs:line 620
   at Cassandra.IntegrationTests.Core.SessionTests.Session_With_Host_Changing_Distance() in /jenkins/workspace/scylla-master/driver-tests/csharp-driver-matrix-test/csharp-driver-datastax/src/Cassandra.IntegrationTests/Core/SessionTests.cs:line 283
   at NUnit.Framework.Internal.TaskAwaitAdapter.GenericAdapter`1.BlockUntilCompleted()
   at NUnit.Framework.Internal.MessagePumpStrategy.NoMessagePumpStrategy.WaitForCompletion(AwaitAdapter awaiter)
   at NUnit.Framework.Internal.AsyncToSyncAdapter.Await(Func`1 invoke)
   at NUnit.Framework.Internal.Commands.TestMethodCommand.RunTestMethod(TestExecutionContext context)
   at NUnit.Framework.Internal.Commands.TestMethodCommand.Execute(TestExecutionContext context)
   at NUnit.Framework.Internal.Commands.BeforeAndAfterTestCommand.<>c__DisplayClass1_0.<Execute>b__0()
   at NUnit.Framework.Internal.Commands.DelegatingTestCommand.RunTestMethodInThreadAbortSafeZone(TestExecutionContext context, Action action)

[sylwiaszunejko]

Adding scylladb driver to the matrix showed that this test is only flaky for datastax not scylladb's fork, we also didn't have any problems with it in the CI