R on Spark
SparkR is an R package that provides a light-weight frontend to use Spark from R.
Libraries of sparkR need to be created in
$SPARK_HOME/R/lib. This can be done by running the script
By default the above script uses the system wide installation of R. However, this can be changed to any user installed location of R by setting the environment variable
R_HOME the full path of the base directory where R is installed, before running install-dev.sh script.
# where /home/username/R is where R is installed and /home/username/R/bin contains the files R and RScript export R_HOME=/home/username/R ./install-dev.sh
Build Spark with Maven and include the
-Psparkr profile to build the R package. For example to use the default Hadoop versions you can run
build/mvn -DskipTests -Psparkr package
You can start using SparkR by launching the SparkR shell with
sparkR script automatically creates a SparkContext with Spark by default in
local mode. To specify the Spark master of a cluster for the automatically created
SparkContext, you can run
./bin/sparkR --master "local"
To set other options like driver memory, executor memory etc. you can pass in the spark-submit arguments to
Using SparkR from RStudio
If you wish to use SparkR from RStudio or other R frontends you will need to set some environment variables which point SparkR to your Spark installation. For example
# Set this to where Spark is installed Sys.setenv(SPARK_HOME="/Users/username/spark") # This line loads SparkR from the installed directory .libPaths(c(file.path(Sys.getenv("SPARK_HOME"), "R", "lib"), .libPaths())) library(SparkR) sparkR.session()
Making changes to SparkR
The instructions for making contributions to Spark also apply to SparkR.
If you only make R file changes (i.e. no Scala changes) then you can just re-install the R package using
R/install-dev.sh and test your changes.
Once you have made your changes, please include unit tests for them and run existing unit tests using the
R/run-tests.sh script as described below.
The SparkR documentation (Rd files and HTML files) are not a part of the source repository. To generate them you can run the script
R/create-docs.sh. This script uses
knitr to generate the docs and these packages need to be installed on the machine before using the script. Also, you may need to install these prerequisites. See also,
Examples, Unit tests
SparkR comes with several sample programs in the
To run one of them, use
./bin/spark-submit <filename> <args>. For example:
You can run R unit tests by following the instructions under Running R Tests.
Running on YARN
./bin/spark-submit can also be used to submit jobs to YARN clusters. You will need to set YARN conf dir before doing so. For example on CDH you can run
export YARN_CONF_DIR=/etc/hadoop/conf ./bin/spark-submit --master yarn examples/src/main/r/dataframe.R