Github user zjffdu commented on the issue:
https://github.com/apache/zeppelin/pull/1503
That's correct for LivySparkInterpreter, LivyPySparkInterpreter and
LivySparkRInterpreter. Because they use FIFOScheduler. If you check the
implenentaion of FIFOScheduler, there's only one thread in it, and each job
will run in FIFO order. But this is different for LivySparkSQLInterpreter as it
can use ParallelScheduler if set zeppelin.livy.concurrentSQL as true. This is
why I mention before there're many issues in LivyInterpreter, it doesn't make
sense to use FIFOScheduler for LivySparkInterpreter, LivyPySparkInterpreter and
LivySparkRInterpreter. Because each user's sessions are isolated in livy, we
should use ParallelScheduler.
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