Github user srowen commented on a diff in the pull request:
    --- Diff: core/src/main/scala/org/apache/spark/api/r/RBackendHandler.scala 
    @@ -284,7 +286,7 @@ private[r] object JVMObjectTracker {
    -  def remove(id: String): Option[Object] = {
    +  def remove(id: String) {
    --- End diff --
    Although it's normal to return the object that was removed from map 
methods, if this isn't desired, I'd declare this as `: Unit` to be clear

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