Github user Leemoonsoo commented on the pull request:
https://github.com/apache/incubator-zeppelin/pull/789#issuecomment-201166366
The reason set env in RemoteInterpreter is, environment variable need to
set before the process creation. So shell script (./bin/interpreter.sh) can
take these environment variables.
The reason system properties set in RemoteInterpreterServer is, if system
properties are set through commandline argument, very long list of system
properties may exceeds the limit of maximum argument length on the system.
I think this PR will not impact much about Spark interpreter and it's
properties (e.g. `spark.executor.memory`). Without this PR, Spark interpreter
already overrides spark conf value from zeppelin interpreter properties.
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