Github user sun-rui commented on the pull request:
https://github.com/apache/spark/pull/9390#issuecomment-156604715
@brkyvz, the infinite loop if the environment is not cleared is because the
inheritence of the R_PROFILE_USER env var set for launching SparkR, which
causes recursive execution of sparkR.init(). By resetting R_PROFILE_USER to
point to $SPARK_HOME/R/lib/profile/general.R, the SparkR lib path is added into
the R lib search paths, as well as elimination of the infinite loop. "one
stone, two birds":)
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