liuxunorg opened a new pull request #3387: [ZEPPELIN-3778] Cluster synchronize notes & authorization URL: https://github.com/apache/zeppelin/pull/3387 ### What is this PR for? In cluster mode, The user creates, modifies, and deletes the note on any of the zeppelin servers. All need to be notified to all the zeppelin servers in the cluster to synchronize the update of Notebook. Failure to do so will result in the user not being able to continue while switching to another server. 1. Listen for note create/delete/update events 2. Listen for note Notebook Authorization events 3. Broadcast note update event ### What type of PR is it? [Feature] ### What is the Jira issue? * https://issues.apache.org/jira/browse/ZEPPELIN-3778 ### How should this be tested? * [CI Pass](https://travis-ci.org/liuxunorg/zeppelin/builds/546647637) ### Screenshots (if appropriate) ### Sync note event  ### Sync note Authorization  ### Questions: * Does the licenses files need update? * Is there breaking changes for older versions? * Does this needs documentation?
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