[PR] Fix flaky ShortInitializationTimeout tests in DescribeConsumerGroupTest [kafka]

["bkurdi97 (via GitHub)" <gi...@apache.org>]

bkurdi97 opened a new pull request, #23469:
URL: https://github.com/apache/kafka/pull/23469

   The four ShortInitializationTimeout tests were flaky because the try-with-resources initialised consumerGroupClosable (starting the consumer background thread) before consumerGroupService (creating the Admin client). During that gap the consumer could race ahead and complete __consumer_offsets creation, so by the time describeGroups / collectGroup* was called the coordinator was already live and responded in < 1 ms — no timeout, assertion fails.
   
   Fix: swap the resource order so the Admin client is ready before the consumer thread starts, ensuring FindCoordinator is dispatched while __consumer_offsets is still being created.
   
   Also remove the duplicate assertThrows in
   testDescribeGroupMembersWithShortInitializationTimeout: the first call takes ~100 ms to time out (retry backoff), during which the consumer fully initialises the group. A second call then finds a stable coordinator and does not throw, making the second assertion inherently flaky.


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Re: [PR] Fix flaky ShortInitializationTimeout tests in DescribeConsumerGroupTest [kafka]

["bkurdi97 (via GitHub)" <gi...@apache.org>]

bkurdi97 closed pull request #23469: Fix flaky ShortInitializationTimeout tests in DescribeConsumerGroupTest
URL: https://github.com/apache/kafka/pull/23469


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