zjffdu opened a new pull request #3324: [ZEPPELIN-4042]. IPythonClient is not shutdown properly URL: https://github.com/apache/zeppelin/pull/3324 ### What is this PR for? Trivial PR to fix the IPythonClient not shutdown issue. Otherwise user will get the following error ``` Channel ManagedChannelImpl{logId=6, target=127.0.0.1:43464} was not shutdown properly!!! ~*~*~* Make sure to call shutdown()/shutdownNow() and wait until awaitTermination() returns true. java.lang.RuntimeException: ManagedChannel allocation site at io.grpc.internal.ManagedChannelOrphanWrapper$ManagedChannelReference.<init>(ManagedChannelOrphanWrapper.java:103) at io.grpc.internal.ManagedChannelOrphanWrapper.<init>(ManagedChannelOrphanWrapper.java:53) at io.grpc.internal.ManagedChannelOrphanWrapper.<init>(ManagedChannelOrphanWrapper.java:44) at io.grpc.internal.AbstractManagedChannelImplBuilder.build(AbstractManagedChannelImplBuilder.java:410) ... ``` ### What type of PR is it? [Bug Fix ] ### Todos * [ ] - Task ### What is the Jira issue? * https://issues.apache.org/jira/browse/ZEPPELIN-4042 ### 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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