Github user tzolov commented on the pull request:
https://github.com/apache/incubator-zeppelin/pull/173#issuecomment-128270221
FYI, I made a small commit just to trigger a new Travis CI build. Sometimes
TravisCI fails with no obvious reasons and there is no way to restart it but to
commit.
The change itself is addition of a safeguard in the open() method to ensure
the previous connections are closed. (e.g. some sort of method idempotency
guarantees).
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