KAFKA-16600: Periodically receive "Failed to transition to PENDING_SHUTDOWN, current state is PENDING_SHUTDOWN" during streams close#21671
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…UTDOWN, current state is PENDING_SHUTDOWN" during streams close Including a unit test that reliably fails before the fix from KAFKA-17379 and reliably passes afterward. It's a bit heavy-handed, but it seems to be consistent.
Simplify and harden the regression test for KAFKA-17379 by removing the 100-attempt loop and repeated KafkaStreams creation, increasing the number of concurrent close threads from 4 to 10, and clarifying assertion messages. The test still starts the streams, races multiple close() invocations against closeToError(), and fails if any close() throws; the change aims to make the test more deterministic and faster while preserving coverage of the race condition.
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Note: this doesn't fix anything; it adds a unit test to catch regression.
The change includes a unit test that reliably fails before the fix from KAFKA-17379 and reliably passes afterward. It's a bit heavy-handed, but it seems to be consistent.