[CASSANDRA-16888] SSTableReaderTest#testGetPositionsKeyCacheStats failing sporadically on unexpected key cache hit for non-cached key

• Type: Bug
• Status: Resolved
• Priority: Normal
• Resolution: Fixed
• Fix Version/s: 4.0.2, 4.1-alpha1, 4.1
• Component/s: Local/Caching
• Bug Category: Correctness - Test Failure
• Severity: Normal
• Complexity: Normal
• Discovered By: Unit Test
• Platform: All
• Since Version: 4.0.1

Source Control Link

https://github.com/apache/cassandra/commit/bc052fa68f525155246de498cc86bb192f2d479a

Test and Documentation Plan

This patch fixes an existing test class.

• Assignee: Caleb Rackliffe
• Reporter: Caleb Rackliffe

Authors

Caleb Rackliffe

Reviewers

Marcus Eriksson

• Created: 26/Aug/21 21:08
• Updated: 27/May/22 19:25
• Resolved: 09/Sep/21 19:14

Description

This has started to pop up on 4.0.x and trunk builds in both CircleCI and Apache CI:

https://app.circleci.com/pipelines/github/josh-mckenzie/cassandra/60/workflows/15e09ea4-4d35-4035-9afc-ff0d1089041e/jobs/382

https://app.circleci.com/pipelines/github/maedhroz/cassandra/332/workflows/3bd588d9-717f-4877-8e78-7a127180dfee/jobs/2093/tests#failed-test-0

https://ci-cassandra.apache.org/view/patches/job/Cassandra-devbranch/1067/testReport/junit/org.apache.cassandra.io.sstable/SSTableReaderTest/testGetPositionsKeyCacheStats_cdc/
 
It passes consistently in local runs, although I have seen one failure in about 10 runs.