Add tests for ShutdownWorker graceful degradation #9297
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What
Adds unit tests to verify
ShutdownWorkerAPI handles poll cancellation errors gracefully.Why
During rolling upgrades, frontend may be updated before matching. If frontend calls
CancelOutstandingWorkerPollson an old matching node, it returnsUnimplemented. TheShutdownWorkerAPI should still succeed (graceful degradation).How
TestShutdownWorkerWithCancellationError: All cancellation calls fail, verifies ShutdownWorker succeedsTestShutdownWorkerWithPartialCancellationFailure: Mixed success/failure (2 succeed, 2 fail), verifies ShutdownWorker succeeds