Github user felixcheung commented on a diff in the pull request:
https://github.com/apache/spark/pull/16154#discussion_r91200190
--- Diff: core/src/main/scala/org/apache/spark/api/r/JVMObjectTracker.scala
---
@@ -0,0 +1,65 @@
+/*
+ * Licensed to the Apache Software Foundation (ASF) under one or more
+ * contributor license agreements. See the NOTICE file distributed with
+ * this work for additional information regarding copyright ownership.
+ * The ASF licenses this file to You under the Apache License, Version 2.0
+ * (the "License"); you may not use this file except in compliance with
+ * the License. You may obtain a copy of the License at
+ *
+ * http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package org.apache.spark.api.r
+
+import java.util.concurrent.atomic.AtomicInteger
+import java.util.concurrent.ConcurrentHashMap
+
+/** JVM object ID wrapper */
+private[r] case class JVMObjectId(id: String)
+
+/**
+ * Counter that tracks JVM objects returned to R.
+ * This is useful for referencing these objects in RPC calls.
+ */
+private[r] class JVMObjectTracker {
+
+ private[this] val objMap = new ConcurrentHashMap[JVMObjectId, Object]()
+ private[this] val objCounter = new AtomicInteger()
+
+ /**
+ * Returns the JVM object associated with the input key.
+ * Returns null if the key does not exist or has been removed.
+ */
+ @throws[NullPointerException]("if key is null")
+ final def get(id: JVMObjectId): Object = objMap.get(id)
--- End diff --
I'd agree completely, but generally the R-friendly handling would need to
be done on the R side.
Related JIRA:
https://issues.apache.org/jira/browse/SPARK-17838
https://issues.apache.org/jira/browse/SPARK-18040
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