Anton Vinogradov created IGNITE-28830:
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Summary: Flaky
CacheGroupsMetricsRebalanceTest#testRebalanceProgressUnderLoad:
EVT_CACHE_REBALANCE_STOPPED listener is registered after the joining node
starts rebalancing
Key: IGNITE-28830
URL: https://issues.apache.org/jira/browse/IGNITE-28830
Project: Ignite
Issue Type: Bug
Reporter: Anton Vinogradov
{{testRebalanceProgressUnderLoad()}} registers an
{{EVT_CACHE_REBALANCE_STOPPED}} listener via
{{ignite.events().localListen(...)}} *after* {{startGrid(4)}}. The joining node
begins rebalancing during {{start()}}, so the event can fire before the
listener is registered. The event is then missed, the {{CountDownLatch}} is
never counted down, and the unbounded {{latch.await()}} hangs until the 600s
test timeout.
Reproduces in ~7% of runs; a thread dump shows the test runner parked in
{{latch.await()}}.
h3. Fix
Register the listener through node configuration
({{IgniteConfiguration.setLocalEventListeners}}) so it is active before the
node joins and starts rebalancing. Both paths funnel into
{{GridEventStorageManager.registerListener}} and neither enables the event
type, so delivery is identical — the listener is simply active earlier.
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