Github user jongyoul commented on the issue:
https://github.com/apache/zeppelin/pull/1265
@bzz If different users run a same interpreter with 'isolated', Zeppelin
runs multiple process for that interpreters, and with 'scoped', Zeppelin runs a
single process for it but the users feel like a separate process because
Zeppelin interpreter use different class loader per user. For instance, if some
users use SparkInterpreter with 'isolated' and 'scoped', all users look like
running each SparkInterpreter.
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