liuxunorg opened a new pull request #3397: [ZEPPELIN-4208] Cluster synchronize InterpreterSetting URL: https://github.com/apache/zeppelin/pull/3397 ### What is this PR for? In cluster mode, The user creates, modifies, and deletes the InterpreterSetting on any of the zeppelin servers. All need to be notified to all the zeppelin servers in the cluster to synchronize the update of InterpreterSetting. Failure to do so will result in the user not being able to continue while switching to another server. 1. Listen for note update events Listen for the NEW_INTERPRETER_SETTING、DEL_INTERPRETER_SETTING、UPDATE_INTERPRETER_SETTING ... event of the InterpreterSetting in the InterpreterSettingManager#onMessage() function. 2. Broadcast note update event The note is refreshed by notifying the event to all zeppelin servers in the cluster via messagingService. ### What type of PR is it? [Feature] ### What is the Jira issue? * https://issues.apache.org/jira/browse/ZEPPELIN-4208 ### How should this be tested? * [CI Pass](https://travis-ci.org/liuxunorg/zeppelin/builds/554484474) ### Screenshots (if appropriate)  ### Questions: * Does the licenses files need update? * Is there breaking changes for older versions? * Does this needs documentation?
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