Github user srowen commented on a diff in the pull request:
    --- Diff: core/src/main/scala/org/apache/spark/api/r/RBackendHandler.scala 
    @@ -263,18 +264,19 @@ private[r] object JVMObjectTracker {
       // TODO: This map should be thread-safe if we want to support multiple
       // connections at the same time
    -  private[this] val objMap = new HashMap[String, Object]
    +  private[this] val objMap: ConcurrentMap[String, Object] =
    --- End diff --
    Not that it matters a lot, but do you need the reference type?

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