zjffdu opened a new pull request #3686: [ZEPPELIN-4680]. Add method to release note memory and add option to disable JobManager URL: https://github.com/apache/zeppelin/pull/3686 ### What is this PR for? For zeppelin will load all notes in 2 places. One is QuartzSchedulerService.java where it would read all notes and refresh their cron job. Another is JobManagerService. In order to solve the memory issue, I introduce the `unLoad` method in `Note` to release memory in `QuartzSchedulerService` after refreshing cron job. Another approach is to disable JobManager (Job tab in zeppelin UI), The Job tab is not so useful IMHO. We should redesign that only to show the cron enabled jobs. But this redesign should be done later in another PR. ### What type of PR is it? [Improvement] ### Todos * [ ] - Task ### What is the Jira issue? * https://issues.apache.org/jira/browse/ZEPPELIN-4680 ### How should this be tested? * Manually tested ### 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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