Yanbo Liang updated SPARK-17904:
    Summary: Add a wrapper function to install R packages on each executors.  
(was: Add a wrapper function to download and install R packages on each 

> Add a wrapper function to install R packages on each executors.
> ---------------------------------------------------------------
>                 Key: SPARK-17904
>                 URL: https://issues.apache.org/jira/browse/SPARK-17904
>             Project: Spark
>          Issue Type: New Feature
>          Components: SparkR
>            Reporter: Yanbo Liang
> SparkR provides {{spark.lappy}} to run local R functions in distributed 
> environment, and {{dapply}} to run UDF on SparkDataFrame.
> If users use third-party libraries inside of the function which was passed 
> into {{spark.lappy}} or {{dapply}}, they should install required R packages 
> on each executor in advance.
> To install dependent R packages on each executors and check it successfully, 
> we can run similar code like following:
> {code}
> rdd <- SparkR:::lapplyPartition(SparkR:::parallelize(sc, 1:2, 2L), 
> install.packages("Matrix”))
> test <- function(x) { "Matrix" %in% rownames(installed.packages()) }
> rdd <- SparkR:::lapplyPartition(SparkR:::parallelize(sc, 1:2, 2L), test )
> collectRDD(rdd)
> {code}
> It’s cumbersome to run this code snippet each time when you need third-party 
> library, since SparkR is an interactive analytics tools, users may call lots 
> of libraries during the analytics session. In native R, users can run 
> {{install.packages()}} and {{library()}} across the interactive session.
> Should we provide one API to wrapper the work mentioned above, then users can 
> install dependent R packages to each executor easily? 
> I propose the following API:
> {{spark.installPackages(pkgs, repos)}}
> * pkgs: the name of packages. If repos = NULL, this can be set with a 
> local/hdfs path, then SparkR can install packages from local package archives.
> * repos: the base URL(s) of the repositories to use. It can be NULL to 
> install from local directories.

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