AyWa opened a new pull request #3337: [ZEPPELIN-4078] Ipython queue performance URL: https://github.com/apache/zeppelin/pull/3337 ### What is this PR for? The pr is to fix a bug that will make the **ipython** queue listener, overuse cpu. After this fix, cpu usage should be way lower. Also there is a bit of refactor to use only one queue to ensure emssage will be order even with a sleep. ### What type of PR is it? Bug Fix / performance improvement ### Todos * [x] - Performance improvement * [ ] - Need to add some performance test ? or other test ? ### What is the Jira issue? It is one part of the jira issue. https://issues.apache.org/jira/browse/ZEPPELIN-4078 ### How should this be tested? * First time? Setup Travis CI as described on https://zeppelin.apache.org/contribution/contributions.html#continuous-integration * Strongly recommended: add automated unit tests for any new or changed behavior * Outline any manual steps to test the PR here. ### 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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