Github user napsternxg commented on a diff in the pull request:
https://github.com/apache/spark/pull/10836#discussion_r50224572
--- Diff: R/README.md ---
@@ -1,6 +1,16 @@
# R on Spark
SparkR is an R package that provides a light-weight frontend to use Spark
from R.
+### Installing sparkR
+
+Libraries of sparkR need to be created in `$SPARK_HOME/R/lib`. This can be
done by running the script `$SPARK_HOME/R/install-dev.sh`.
--- End diff --
I am sorry if my I was not clear before but what I mean is the following:
1. In order for the code `.libPaths(c(file.path(Sys.getenv("SPARK_HOME"),
"R", "lib"), .libPaths()))` to work, the directory `$SPARK_HOME/R/lib` needs to
exist. When we build spark using `build/mvn -DskipTests clean package` this
directory is not created by default. Hence we have to run `install-dev.sh` in
order to use SparkR from an R shell.
Also, if we look at the code in `install-dev.sh`, the following lines
actually create the `lib` directory.
```
FWDIR="$(cd `dirname $0`; pwd)"
LIB_DIR="$FWDIR/lib"
mkdir -p $LIB_DIR
```
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