Github user sun-rui commented on the pull request:
https://github.com/apache/spark/pull/10652#issuecomment-173116720
It is possible to get deploy mode from "spark.submit.deployMode", and check
if it is "client". You can take a look at
https://github.com/apache/spark/blob/master/core/src/main/scala/org/apache/spark/api/r/RUtils.scala#L49
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