Github user zjffdu commented on the issue:
https://github.com/apache/zeppelin/pull/1215
After checking ShellInterpreter.java, I found other 2 issues.
* Should remove entry from executors after the shell execution is done
otherwise it would accumulate more and more.
* executors should be ConcurrentHashMap as it would be accessed in 2
threads (interpret & cancel will be in 2 threads if I understand correctly)
I push another commit to fix these 2 issues, let me know if it is better to
do it another ticket.
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