Github user Leemoonsoo commented on the issue:
https://github.com/apache/zeppelin/pull/1349
Hi, @gbloisi Thanks for the contribution.
Zeppelin can be built with one version of Spark. The specific version of
spark dependencies will be collected into "${INTERPRETER_DIR}/dep". When user
doesn't have local spark installation, Zeppelin will load them in the classpath.
When user have spark installation, Zeppelin allows user set SPARK_HOME to a
different version that Zeppelin has been built with. It supposed to work.
So when SPARK_HOME is set, Zeppelin will run interpreter process with
SPARK_HOME/bin/spark-submit command and it'll include spark dependencies under
SPARK_HOME in the classpath. And the spark dependencies version can be
different from dependencies in "${INTERPRETER_DIR}/dep". So we probably don't
want to add "${INTERPRETER_DIR}/dep" into the classpath in this case.
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