Caleb Rackliffe created CASSANDRA-18348:
-------------------------------------------

             Summary: CEP-21: AlterTest#unknownMemtableConfigurationTest fails 
on possibly no longer valid assumptions around schema propagation
                 Key: CASSANDRA-18348
                 URL: https://issues.apache.org/jira/browse/CASSANDRA-18348
             Project: Cassandra
          Issue Type: Bug
            Reporter: Caleb Rackliffe


See: 
[https://app.circleci.com/pipelines/github/beobal/cassandra/406/workflows/00cdb02e-4b3e-477a-b997-403121172249/jobs/4201/tests]

The test hangs on L156, which the test assumes should succeed w/ node 1 having 
correct local configuration:

{noformat}
cluster.schemaChange("ALTER TABLE " + KEYSPACE + ".tbl WITH memtable = 
'testconfig'", false, node1);
{noformat}

In the logs...

{noformat}
ERROR [node2_isolatedExecutor:1] node2 2023-03-17 12:26:07,943 
JVMStabilityInspector.java:68 - Exception in thread 
Thread[node2_isolatedExecutor:1,5,isolatedExecutor]
org.apache.cassandra.exceptions.ConfigurationException: Memtable configuration 
"testconfig" not found.
        at 
org.apache.cassandra.schema.MemtableParams.parseConfiguration(MemtableParams.java:155)
        at java.base/java.util.HashMap.computeIfAbsent(HashMap.java:1133)
        at 
org.apache.cassandra.schema.MemtableParams.get(MemtableParams.java:111)
        at 
org.apache.cassandra.cql3.statements.schema.TableAttributes.build(TableAttributes.java:129)
        at 
org.apache.cassandra.cql3.statements.schema.TableAttributes.asNewTableParams(TableAttributes.java:65)
        at 
org.apache.cassandra.cql3.statements.schema.AlterTableStatement$AlterOptions.validate(AlterTableStatement.java:444)
        at 
org.apache.cassandra.distributed.impl.Coordinator.unsafeExecuteInternal(Coordinator.java:114)
{noformat}

{noformat}
ERROR 17:26:12 Could not process the entry
java.lang.AssertionError: null
        at 
org.apache.cassandra.tcm.log.LocalLog.processPendingInternal(LocalLog.java:272)
        at 
org.apache.cassandra.tcm.log.LocalLog$Async$AsyncRunnable.run(LocalLog.java:473)
        at 
org.apache.cassandra.concurrent.InfiniteLoopExecutor.loop(InfiniteLoopExecutor.java:121)
{noformat}

{noformat}
java.lang.IllegalStateException: Schema agreement not reached. Schema versions 
of the instances: [00000000-0000-0000-0000-000000000009, 
00000000-0000-0000-0000-000000000006]

        at 
org.apache.cassandra.distributed.impl.AbstractCluster$ChangeMonitor.waitForCompletion(AbstractCluster.java:895)
        at 
org.apache.cassandra.distributed.impl.AbstractCluster.lambda$schemaChange$8(AbstractCluster.java:824)
        at org.apache.cassandra.concurrent.FutureTask$1.call(FutureTask.java:96)
{noformat}



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