Github user andreaTP commented on the issue:
https://github.com/apache/zeppelin/pull/2322
@felixcheung good catch, after a second look I can see that while it is
waiting on `pollEvent` it will also delay the `sendEvent` since it is
`synchronized` too.
I guess all these problems are already solved by Java standard lib, if I
have positive feedback I will go substituting `eventQueue` with a
[LinkedBlockingQueue](https://docs.oracle.com/javase/7/docs/api/java/util/concurrent/LinkedBlockingQueue.html)
and removing all `synchronized` statements since they become unuseful.
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