Github user agoodm commented on the issue: https://github.com/apache/zeppelin/pull/1439 @Leemoonsoo Thanks for the feedback. Indeed I think your first point on the Experimental annotation made sense, so I have changed it. As for your second point, I am not really sure how to best go about it myself. When I first created the JIRA issue, I came up with a quick implementation that used kept separate registries for each `Interpreter` instance. It was certainly simpler, but the main problem that I ran into was that I couldn't figure out how to make sure those changes in the registry entered by the user were broadcasted to the ZeppelinServer side. I studied the implementation of `AngularObjectRegistry` in order to understand how this could be done in Zeppelin, and that is ultimately what led me to this current implementation which uses thrift. I am still in the process of learning the core Zeppelin codebase, so if you had any specific ideas, I would appreciate it. Also, can you also be specific on how this change would make it possible to pass actual references to functions instead of code strings (hence why I used put "callbacks" in quotes in the original PR)? I don't consider this to be too important but am just curious. Finally, can you provide some insight for some of the odd CI build failures I have been experiencing with more recent commits? Thanks!
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