rdhabalia opened a new pull request #2548: Stop all functions gracefully on closing worker-service URL: https://github.com/apache/incubator-pulsar/pull/2548 ### Motivation Right now, if stopping [WorkerService](https://github.com/apache/incubator-pulsar/blob/master/pulsar-functions/worker/src/main/java/org/apache/pulsar/functions/worker/WorkerService.java#L189) doesn't stop functions and all the threads stayed alive event `WorkerService` is stopped. ### Modifications Stop all function resource gracefully while stopping worker service. ### Result Function threads will not stay alive while stopping worker-service.
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