Github user zjffdu commented on the issue:
https://github.com/apache/spark/pull/14639
Thanks @sun-rui, `EXISTING_SPARKR_BACKEND_PORT` do indicate cluster mode
indirectly for now. But here not only deployMode is unknown in R side, but also
master and other spark configurations. For now R only use master & depolyMode,
but maybe in future it would use other configurations, so here I think
propogating SparkConf from JVM to R is a better long term solution.
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