Github user zjffdu commented on the issue:

    https://github.com/apache/zeppelin/pull/1503
  
    That's should be fine to use HashMap for SparkR and PySpark, as their 
scheduler is FIFOScheduler which only one thread will access the map at one 
time. But it would be better to use `ConcurrentHashMap` in case we share 
sparkContext across all the interpreters.  


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