zjffdu opened a new pull request #3674: [ZEPPELIN-4662]. Spark driver OOM cause Connection refused error in frontend URL: https://github.com/apache/zeppelin/pull/3674 ### What is this PR for? This PR is an improvement PR which to display more meaningful error in frontend when spark driver OOM in yarn mode. Currently zeppelin would display connection refused in frontend if spark driver happen OOM. This PR would display the real yarn diagnostic info in frontend. In this PR, I will launch a yarn app monitoring thread to monitor the all the yarn app status. And would capture the yarn diagnostics if it failed. ### What type of PR is it? [ Feature] ### Todos * [ ] - Task ### What is the Jira issue? * https://issues.apache.org/jira/browse/ZEPPELIN-4662 ### 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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