Github user beriaanirudh commented on the issue:
https://github.com/apache/zeppelin/pull/1283
It is easier to handle the twice output on the javascript side, so I have
added the check in file `paragraph.controller.js`. The browser would not let
results to be appended if the paragraph is completed. Also, since we are
buffering events now, there would be few (1-2) events called after paragraph
execution completion.
Working on your other comments..
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