[GitHub] [zeppelin] zjffdu opened a new pull request #3355: [ZEPPELIN-4133]. Idle sessions are no longer being closed even though TimeoutLifecycleManagement is configured properly

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zjffdu opened a new pull request #3355: [ZEPPELIN-4133]. Idle sessions are no longer being closed even though TimeoutLifecycleManagement is configured properly
URL: https://github.com/apache/zeppelin/pull/3355
 
 
   ### What is this PR for?
   The root cause is that we use Timer to scheduler periodical interpreter checking task. But java Timer has one critical issue that once the Timer thread is crashed, subsequent task will be suppressed. This PR use ScheduledExecutorService instead to fix this issue. 
   
   ### What type of PR is it?
   [Bug Fix]
   
   ### Todos
   * [ ] - Task
   
   ### What is the Jira issue?
   * https://issues.apache.org/jira/browse/ZEPPELIN-4133
   
   ### 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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