Github user HyukjinKwon commented on a diff in the pull request:

    https://github.com/apache/spark/pull/15131#discussion_r79298358
  
    --- Diff: R/pkg/R/context.R ---
    @@ -225,6 +225,37 @@ setCheckpointDir <- function(sc, dirName) {
       invisible(callJMethod(sc, "setCheckpointDir", 
suppressWarnings(normalizePath(dirName))))
     }
     
    +#' Add a file or directory to be downloaded with this Spark job on every 
node.
    +#'
    +#' The path passed can be either a local file, a file in HDFS (or other 
Hadoop-supported
    +#' filesystems), or an HTTP, HTTPS or FTP URI.  To access the file in 
Spark jobs,
    +#' use sparkFiles.get(fileName) to find its download location.
    +#'
    +#' A directory can be given if the recursive option is set to true.
    +#' Currently directories are only supported for Hadoop-supported 
filesystems.
    +#'
    +#' @param path The path of the files to be added
    +#' @param recursive Recursive or not if the path is directory. Default is 
FALSE.
    +#' @noRd
    +#' @examples
    +#'\dontrun{
    +#' sc <- sparkR.init()
    +#' addFile(sc, "myfile")
    +#'}
    +addFile <- function(sc, path) {
    +  invisible(callJMethod(sc, "addFile", 
suppressWarnings(normalizePath(path))))
    --- End diff --
    
    Otherwise, I think we can not just `normalizePath` here to avoid this 
problem. I will let you know after testing if that would really avoid this 
problem.


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