Github user FireArrow commented on the issue:
https://github.com/apache/zeppelin/pull/1762
Failure seems unrelated... It fails with a null pointer here:
https://github.com/FireArrow/zeppelin/blob/ZEPPELIN-1810%5D/zeppelin-zengine/src/test/java/org/apache/zeppelin/notebook/NotebookTest.java#L309
But it only happened on one of the build jobs. Not sure what that's about.
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