Ivan Zlenko created IGNITE-28355:
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Summary: ItNodeTest.testNewPeersConfigurationAppliedListener is
potentially flaky due to race between async listener callback and verify
Key: IGNITE-28355
URL: https://issues.apache.org/jira/browse/IGNITE-28355
Project: Ignite
Issue Type: Improvement
Components: raft ai3
Reporter: Ivan Zlenko
Assignee: Ivan Zlenko
The test calls changePeersAndLearnersAsync in a loop, each iteration changing
the RAFT group to a single new peer + learner. After each change, it waits for
the new leader to appear via waitForCondition, then immediately verifies that
onNewPeersConfigurationApplied was called on the mock listener.
The problem is that onNewPeersConfigurationApplied is scheduled asynchronously
on the old leader's common executor, while the test's waitForCondition only
checks that the new leader has been elected. The new leader election can
complete before the old leader's executor processes the listener callback,
causing verify(times(1)) to fail.
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