Github user felixcheung commented on the issue:
https://github.com/apache/zeppelin/pull/1787
ah, that's unfortunate. the feedback was it would be inconsistent and
confusing to have multiple default values for the timeout, instead it is moved
to the top of the
[function](https://github.com/apache/spark/pull/15471/files#diff-8ed17b5ecd168e47a2433cc9b3bc5b17R157)
- but I can see the caller of connectBackend (though not officially supported)
can be broken by this.
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