zjffdu opened a new pull request #3652: [ZEPPELIN-4614]. Dead lock in ZeppelinServer URL: https://github.com/apache/zeppelin/pull/3652 ### What is this PR for? This PR is to fix the dead lock issue in ZeppelinServer. The deadlock happens in Paragraph (See jira for jstack details). Besides that I add more logging in this PR. ### What type of PR is it? [Bug Fix] ### Todos * [ ] - Task ### What is the Jira issue? * https://issues.apache.org/jira/browse/ZEPPELIN-4614 ### How should this be tested? * I have run 2 cron jobs for more than 2 days (run it for each 5 minutes), and no deadlock happens again ### 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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