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pyspark should work without installing py4j
reported by
http://mail-archives.apache.org/mod_mbox/incubator-zeppelin-dev/201511.mbox/%3CCAE1e5yE8oHx8brNHK7McaQZwkJmzL_K8JeWOUd80F6g0zu1ZyQ%40mail.gmail.com%3E