Github user shivaram commented on the issue:
https://github.com/apache/spark/pull/14639
@zjffdu Thanks for clarifying -- I now remember that in the YARN cluster
mode there is no `SPARK_HOME` set. However in this case the JVM comes up first
and the R process then connects to it. So in such cases we should never have to
download Spark as Spark is already running.
Thus I think @zjffdu's change of not calling install.spark for cluster mode
is the right fix.
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