amakaur commented on issue #3502: [ZEPPELIN-4413] Added a close note button on zepp ui to shut down sc and release roso… URL: https://github.com/apache/zeppelin/pull/3502#issuecomment-559904916 @zjffdu 1. We're already using TimeoutLifecycleManager to release the resources automatically after 1 hour, but there's an issue with closing notebook this way where https://github.com/apache/zeppelin/blob/master/zeppelin-zengine/src/main/java/org/apache/zeppelin/interpreter/ManagedInterpreterGroup.java#L88 `close(sessionId)` wouldn't get triggered for some of the notebooks randomly and spark context would be alive for couple of days until zeppelin is restarted or notebook is closed using the feature in this PR. Also, we would like the ability to close the notebook at any moment without depending on the timeout. 2. Restarting the interpreter causes notebooks to get stuck in a pending state a lot of the times. So this helps to completely shut down the spark context and bring back the notebook in a fresh clean state. 3. This is similar to https://github.com/apache/zeppelin/pull/3501 but requires less work from the user to close the note. This makes it easy for any user to reset the state of their notebook.
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