While it's true LIVY-424 creates a session leak due to REPL leak in Scala it's 
not the only thing that can.  I've run hundreds of simple scala commands and 
the leak is only mild/moderate.   However, some scala commands can be really 
problematic.  For instance


import org.apache.spark.sql._


run this import repeatedly and within only 10s of executions your sessions 
performance will degrade and eventually run out of memory.

________________________________
From: lk_hadoop <lk_had...@163.com>
Sent: Sunday, November 11, 2018 5:37:34 PM
To: user
Subject: about LIVY-424

[External Email]
________________________________
hi,all:
        I meet this issue https://issues.apache.org/jira/browse/LIVY-424  , 
anybody know how to resolve it?
2018-11-12
________________________________
lk_hadoop

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