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https://issues.apache.org/jira/browse/CASSANDRA-19505?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]
Sam Tunnicliffe updated CASSANDRA-19505:
----------------------------------------
Test and Documentation Plan: Test only fix
Status: Patch Available (was: In Progress)
I found a couple of failure modes here:
* It seems that once in every ~30 runs, one peer is extremely unlucky and every
attempt it makes to contact the one live peer is replaced with a "random"
injected failure. In this scenario, that node is effectively partitioned and so
can neither discover any peers nor be discovered. Added checks in the test to
account for this.
* It's possible for some nodes to have completed their discovery rounds before
others have been able to make a single successful contact. In this case, a node
finishing early won't be able to discover one which starts late. I've
increased the concurrency to mitigate this.
This has now passed for 1000 consecutive runs locally, so I think we should be
good to merge it. If any additional failure cases show up, we can revisit.
> Test failure: org.apache.cassandra.tcm.DiscoverySimulationTest
> --------------------------------------------------------------
>
> Key: CASSANDRA-19505
> URL: https://issues.apache.org/jira/browse/CASSANDRA-19505
> Project: Apache Cassandra
> Issue Type: Bug
> Components: Transactional Cluster Metadata
> Reporter: Brandon Williams
> Assignee: Sam Tunnicliffe
> Priority: Normal
> Fix For: 5.x
>
>
> As seen at
> https://app.circleci.com/pipelines/github/driftx/cassandra/1551/workflows/be2ca359-49d7-4fb3-959d-454656f48d79/jobs/80604/tests
> :
> {noformat}
> junit.framework.AssertionFailedError: expected:<[/127.0.100.1:7012,
> /127.0.100.2:7012, /127.0.100.3:7012, /127.0.100.4:7012, /127.0.100.5:7012,
> /127.0.100.6:7012, /127.0.100.7:7012, /127.0.100.8:7012, /127.0.100.9:7012,
> /127.0.100.10:7012]> but was:<[/127.0.100.1:7012, /127.0.100.2:7012,
> /127.0.100.3:7012, /127.0.100.5:7012, /127.0.100.6:7012, /127.0.100.7:7012,
> /127.0.100.8:7012, /127.0.100.9:7012, /127.0.100.10:7012]>
> at
> org.apache.cassandra.tcm.DiscoverySimulationTest.discoveryTest(DiscoverySimulationTest.java:105)
> at
> java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
> at
> java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:77)
> at
> java.base/jdk.internal.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
> {noformat}
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