Github user krishnakalyan3 commented on a diff in the pull request:

    https://github.com/apache/spark/pull/14179#discussion_r70899726
  
    --- Diff: R/pkg/R/sparkR.R ---
    @@ -155,6 +155,9 @@ sparkR.sparkContext <- function(
     
       existingPort <- Sys.getenv("EXISTING_SPARKR_BACKEND_PORT", "")
       if (existingPort != "") {
    +    if(sparkPackages != ""){
    +        warning("--packages flag should be used with with spark-submit")
    --- End diff --
    
    @shivaram @felixcheung how about something like `sparkPackages cannot be 
used as an argument within sparkR.init please use the --packages flag while 
using spark-submit or sparkR shell`


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