Github user Leemoonsoo commented on the issue:
https://github.com/apache/zeppelin/pull/1596
I think cleaner way to remove `open()` inside of `jobRun()` could be call
`open()` inside of
[LazyOpenInterpreter.getHook()](https://github.com/apache/zeppelin/blob/master/zeppelin-interpreter/src/main/java/org/apache/zeppelin/interpreter/LazyOpenInterpreter.java#L162)
like `LazyOpenInterpreter.interpret()`, `LazyOpenInterpreter.cancel()` and
other methods do.
Regarding create all interpreters once in the same session,
Like you already mentioned, it'll make unnecessary interpreter creation.
Some of interpreters in interpreter group may not work by many reasons
(configuration, system env, external commands, etc).
I would say [Interpreter.getInterpreterInTheSameSessionByClassName()](
https://github.com/apache/zeppelin/blob/master/zeppelin-interpreter/src/main/java/org/apache/zeppelin/interpreter/Interpreter.java#L273)
is a sort of API that manages dependencies of Interpreter. The api returns
LazyInterpreter of another interpreter in the same group. So, interpreter
supposed to simply get reference to the other interpreter use it without
explicitly defining dependency.
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