Merge pull request apache#103 from shivaram/rlibdir-fix

[SPARKR-115] Allow users to set where SparkR is installed

Author: concretevitamin

pkg/R/sparkR.R

@@ -44,16 +44,22 @@ sparkR.init <- function(
   sparkHome = Sys.getenv("SPARK_HOME"),
   sparkEnvir = list(),
   sparkExecutorEnv = list(),
-  sparkJars = "") {
+  sparkJars = "",
+  sparkRLibDir = "") {
 
   if (exists(".sparkRjsc", envir=.sparkREnv)) {
+    cat("Re-using existing Spark Context. Please restart R to create a new Spark Context\n")
     return(get(".sparkRjsc", envir=.sparkREnv))
   }
 
   if (nchar(sparkHome) != 0) {
     sparkHome <- normalizePath(sparkHome)
   }
 
+  if (nchar(sparkRLibDir) != 0) {
+    .sparkREnv$libname <- sparkRLibDir
+  }
+
   sparkEnvirMap <- .jnew("java/util/HashMap")
   for (varname in names(sparkEnvir)) {
     sparkEnvirMap$put(varname, sparkEnvir[[varname]])