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https://issues.apache.org/jira/browse/CASSANDRA-16355?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17285143#comment-17285143
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Benjamin Lerer commented on CASSANDRA-16355:
--------------------------------------------
I digged into the tests and it seems that the issue is that the timeouts are
probably to low for the CI environment. I noticed that the initial insert
query is slower to reach the paxos logic that the following ones.
For the {{incompletePropose}} test, what is happening is that the initial
insert timeout in the {{prepare}} round before this phase is actually completed
on the node. Due to that the original update is never taken into account. The
following update fail silently and the problem is caught by the {{SELECT}}
query.
Another scenario that can happen is that the {{prepare}} round complete but the
{{proposal}} one fail for the coordinator node due to a timeout. In this case
the following update will found the prepared value and ensure that it is
proposed and committed before applying the update. So in practice the test will
succeed even if the executed scenario is not the expected one.
For the {{incompleteCommit}} test what is happening is due to the extra work
left by the original insert the update take longer than expected and timeout.
> Fix flaky test incompletePropose -
> org.apache.cassandra.distributed.test.CASTest
> --------------------------------------------------------------------------------
>
> Key: CASSANDRA-16355
> URL: https://issues.apache.org/jira/browse/CASSANDRA-16355
> Project: Cassandra
> Issue Type: Bug
> Components: Feature/Lightweight Transactions, Test/dtest/java
> Reporter: David Capwell
> Assignee: Benjamin Lerer
> Priority: Normal
> Fix For: 4.0-beta
>
>
> https://app.circleci.com/pipelines/github/dcapwell/cassandra/853/workflows/0766c0de-956e-4831-aa40-9303748a2708/jobs/5030
> {code}
> junit.framework.AssertionFailedError: Expected: [[1, 1, 2]]
> Actual: []
> at
> org.apache.cassandra.distributed.shared.AssertUtils.fail(AssertUtils.java:193)
> at
> org.apache.cassandra.distributed.shared.AssertUtils.assertEquals(AssertUtils.java:163)
> at
> org.apache.cassandra.distributed.shared.AssertUtils.assertRows(AssertUtils.java:63)
> at
> org.apache.cassandra.distributed.test.CASTest.incompletePropose(CASTest.java:124)
> {code}
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