zjffdu opened a new pull request #3491: [ZEPPELIN-4390]. ExecutorService is not properly shutdown URL: https://github.com/apache/zeppelin/pull/3491 ### What is this PR for? `ExecutorService` is not properly shutdown due to we didn't use the correct api. We should use `shutdownNow` instead of `shutdown`. See https://stackoverflow.com/questions/11520189/difference-between-shutdown-and-shutdownnow-of-executor-service. The effect of this issue will cause thread resource leakage. ### What type of PR is it? [Improvement] ### Todos * [ ] - Task ### What is the Jira issue? * https://issues.apache.org/jira/browse/ZEPPELIN-4390 ### How should this be tested? * CI pass ### Screenshots (if appropriate) ### Questions: * Does the licenses files need update? No * Is there breaking changes for older versions? No * Does this needs documentation? No
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