Github user cafreeman commented on the pull request:
https://github.com/apache/spark/pull/7139#issuecomment-120175035
@shivaram The weird thing about R CMD INSTALL in this case is that if you
don't pass `-l` it'll actually install to the first location on your
`.libpaths()` list, which COULD still be `$SPARK_HOME/R/lib` depending on when
[this](https://github.com/apache/spark/blob/master/R/pkg/inst/profile/general.R#L20)
function gets processed.
If I remember right, there's something that ensures that SparkR is the last
library that gets loaded, correct? If that's the case, then R CMD INSTALL would
probably default to the standard package install location for R since that's
all that would exist on `.libPaths()`.
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