Ensure that task results are delivered during pool shutdown #435
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This fix removes a call to
result_handler.terminate()to ensure that theResultHandlerthread stays running and processes any task results in its queue before shutting down. The thread will terminate itself naturally after its queue is emptied.I've added a unit test to exercise this behaviour during pool shutdown.
This fix is required for the integration tests in the following Celery pull request to pass successfully: celery/celery#9986
Fixes #434