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https://issues.apache.org/jira/browse/CASSANDRA-19572?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17840220#comment-17840220
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Stefan Miklosovic commented on CASSANDRA-19572:
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OK so more digging ... I was trying to put into each afterTest
"SSTableReader.resetTidying();" and it did help, below is each job with 5k
repetitions.
4.0
https://app.circleci.com/pipelines/github/instaclustr/cassandra/4223/workflows/a82d0483-a0df-44ed-8127-088b303c78ba/jobs/225432/steps
4.1
https://app.circleci.com/pipelines/github/instaclustr/cassandra/4224/workflows/eae7a5e2-89dd-46cd-aaca-1e4250d0fa8b/jobs/225531/steps
5.0 j11
https://app.circleci.com/pipelines/github/instaclustr/cassandra/4226/workflows/9805ec75-fd02-4c5a-8996-fa5bce71e8c2/jobs/225728/steps
5.0 j17
https://app.circleci.com/pipelines/github/instaclustr/cassandra/4226/workflows/9805ec75-fd02-4c5a-8996-fa5bce71e8c2/jobs/225727/steps
However, I just noticed that there is already afterTest in CQLTester which
ImportTest extends and I was _not_ calling it (super.afterTest()) in my
afterTest. What CQLTester's afterTest does is this (1). It removes the tables
and it deletes all SSTables on the disk, so I guess it also calls tidying, just
by other means, but that whole operation runs in
ScheduledExecutors.optionalTasks which is asynchronous.
So, what happens, when we run a test method, then afterTest is invoked and
removal is done asynchronously? Then JUnit does not wait until is is finished,
right? I think that this work then might leaks beyond the scope of afterTest
and a new test is run etc ... I fee uneasy about this and that is probably the
real cause of the issues we see when it comes to these refs.
What I am doing right now is that I am tidying it up before calling
super.afterTest and I run multiplex on 4.0 again. If it fails, I guess the next
step will be to run the logic in afterTest synchronously.
(1)
https://github.com/apache/cassandra/blob/cassandra-4.1/test/unit/org/apache/cassandra/cql3/CQLTester.java#L417-L433
> Test failure: org.apache.cassandra.db.ImportTest flakiness
> ----------------------------------------------------------
>
> Key: CASSANDRA-19572
> URL: https://issues.apache.org/jira/browse/CASSANDRA-19572
> Project: Cassandra
> Issue Type: Bug
> Components: Tool/bulk load
> Reporter: Brandon Williams
> Assignee: Stefan Miklosovic
> Priority: Normal
> Fix For: 4.0.x, 4.1.x, 5.0.x, 5.x
>
>
> As discovered on CASSANDRA-19401, the tests in this class are flaky, at least
> the following:
> * testImportCorruptWithoutValidationWithCopying
> * testImportInvalidateCache
> * testImportCorruptWithCopying
> * testImportCacheEnabledWithoutSrcDir
> [https://app.circleci.com/pipelines/github/instaclustr/cassandra/4199/workflows/a70b41d8-f848-4114-9349-9a01ac082281/jobs/223621/tests]
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