Doroszlai, Attila created HDDS-1398:
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Summary: Concurrency issue in SCMConnectionManager#getValues
Key: HDDS-1398
URL: https://issues.apache.org/jira/browse/HDDS-1398
Project: Hadoop Distributed Data Store
Issue Type: Bug
Reporter: Doroszlai, Attila
Assignee: Doroszlai, Attila
{{testStartStopDatanodeStateMachine}} is flaky, causing [occasional pre-commit
build
failures|https://builds.apache.org/job/hadoop-multibranch/job/PR-691/1/artifact/out/patch-unit-hadoop-hdds_container-service.txt].
HDDS-1332 added some logging to find out more about the cause.
I think the problem is not test-specific, and is caused by the following:
{{SCMConnectionManager#scmMachines}} is a plain {{HashMap}}, guarded by a
{{ReadWriteLock}} in most places where it's used, except {{getValues()}}. The
method also returns the values collection without any write protection (though
currently none of the callers modify it).
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