Github user zjffdu commented on the issue:
https://github.com/apache/zeppelin/pull/1787
@ejono The root cause is that SPARK_VER doesn't take effect in travis, I
created ZEPPELIN-1918. It would be better to fix the issue here with
ZEPPELIN-1918 together. I would be happy to help if you want to contribute on
this. BTW, you might need to create another profile for spark 2.1.0, because
spark 2.1.0 use another version of pyspark.
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