Github user zjffdu commented on the issue:
https://github.com/apache/zeppelin/pull/1503
@gss2002 I have to admit there's lots of issues in livy interpreter. Your
changes seems a little big for this fix. Would use `ConcurrentHashMap` directly
work for you ? rather than declare `LivyPySparkSessionMap` and
`LivySparkSessionMap`
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