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.
---
If your project is set up for it, you can reply to this email and have your
reply appear on GitHub as well. If your project does not have this feature
enabled and wishes so, or if the feature is enabled but not working, please
contact infrastructure at [email protected] or file a JIRA ticket
with INFRA.
---
