C. Scott Andreas created CASSANDRA-21502:
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Summary: AccordJournalBurnTest Failure - NullPointerException in
DefaultLocalListeners.clear()
Key: CASSANDRA-21502
URL: https://issues.apache.org/jira/browse/CASSANDRA-21502
Project: Apache Cassandra
Issue Type: Bug
Components: Accord
Reporter: C. Scott Andreas
AccordJournalBurnTest#testOne() currently fails with this seed:
1398874140326968L
Reproduce via:
{{// AccordJournalBurnTest.testOne():}}
{{long seed = 1398874140326968L;}}
And run:
{{ant test-jvm-dtest-some
-Dtest.name=org.apache.cassandra.service.accord.journal.AccordJournalBurnTest
-Dtest.methods=testOne}}
The test currently fails with:
{{accord.burn.SimulationException: Failed on seed 1398874140326968}}
{{Caused by: java.lang.NullPointerException}}
{{ at
accord.impl.DefaultLocalListeners.lambda$clear$4(DefaultLocalListeners.java:562)}}
{{ at
accord.impl.DefaultLocalListeners.clear(DefaultLocalListeners.java:556)}}
{{ at
accord.local.CommandStore.unsafeClearForTesting(CommandStore.java:214)}}
DefaultLocalListeners.clear() iterates by count and dereferences every slot.
That array intentionally holds null holes, so once any listener had been
removed, clear() dereferences a null and throws a NullPointerException.
Additional details and a candidate patch available here (model-assisted):
[https://github.com/cscotta/cassandra-accord/pull/1]
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