dbtsai opened a new pull request, #55221:
URL: https://github.com/apache/spark/pull/55221
⏺ ### What changes were proposed in this pull request?
Add `sc.listenerBus.waitUntilEmpty()` before the `completedStage`
assertion in the push-based shuffle test in `DAGSchedulerSuite`.
### Why are the changes needed?
The test was intermittently failing due to a race condition.
`SparkListenerStageCompleted` events are delivered asynchronously through the
listener bus, so the `completedStage` assertion could execute before the
event was processed, causing a spurious failure. Waiting for the
listener bus to drain before asserting eliminates the race.
### Does this PR introduce _any_ user-facing change?
No.
### How was this patch tested?
Existing test in `DAGSchedulerSuite`. The fix removes a race condition
rather than adding new test logic.
### Was this patch authored or co-authored using generative AI tooling?
Generated-by: Claude Sonnet 4.6 (Claude Code)
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