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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