Github user jongyoul commented on the issue:
https://github.com/apache/zeppelin/pull/2418
@echarles Hi, at first, if we enable front-end to access to interpreter
directly, we have to consider that each interpreter has to know whole ACL
information and etc. I don't think it's good design. Second, netty has a
benefit while making connections between server and interpreter. It can be
handled one connection for bidirectional communication.
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