Github user ankurdave commented on a diff in the pull request:
https://github.com/apache/spark/pull/497#discussion_r12456652
--- Diff:
graphx/src/main/scala/org/apache/spark/graphx/impl/RoutingTablePartition.scala
---
@@ -0,0 +1,158 @@
+/*
+ * 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.graphx.impl
+
+import scala.reflect.ClassTag
+
+import org.apache.spark.Partitioner
+import org.apache.spark.rdd.RDD
+import org.apache.spark.rdd.ShuffledRDD
+import org.apache.spark.util.collection.{BitSet, PrimitiveVector}
+
+import org.apache.spark.graphx._
+import org.apache.spark.graphx.util.collection.PrimitiveKeyOpenHashMap
+
+/**
+ * A message from the edge partition `pid` to the vertex partition
containing `vid` specifying that
+ * the edge partition references `vid` in the specified `position` (src,
dst, or both).
+*/
+private[graphx]
+class RoutingTableMessage(
+ var vid: VertexId,
+ var pid: PartitionID,
+ var position: Byte)
+ extends Product2[VertexId, (PartitionID, Byte)] with Serializable {
+ override def _1 = vid
+ override def _2 = (pid, position)
+ override def canEqual(that: Any): Boolean =
that.isInstanceOf[RoutingTableMessage]
+}
+
+private[graphx]
+class RoutingTableMessageRDDFunctions(self: RDD[RoutingTableMessage]) {
+ /** Copartition an `RDD[RoutingTableMessage]` with the vertex RDD with
the given `partitioner`. */
+ def copartitionWithVertices(partitioner: Partitioner):
RDD[RoutingTableMessage] = {
+ new ShuffledRDD[VertexId, (PartitionID, Byte),
RoutingTableMessage](self, partitioner)
+ .setSerializer(new RoutingTableMessageSerializer)
+ }
+}
+
+private[graphx]
+object RoutingTableMessageRDDFunctions {
+ import scala.language.implicitConversions
+
+ implicit def rdd2RoutingTableMessageRDDFunctions(rdd:
RDD[RoutingTableMessage]) = {
+ new RoutingTableMessageRDDFunctions(rdd)
+ }
+}
+
+private[graphx]
+object RoutingTablePartition {
+ val empty: RoutingTablePartition = new RoutingTablePartition(Array.empty)
+
+ /** Generate a `RoutingTableMessage` for each vertex referenced in
`edgePartition`. */
+ def edgePartitionToMsgs(pid: PartitionID, edgePartition:
EdgePartition[_, _])
+ : Iterator[RoutingTableMessage] = {
+ // Determine which positions each vertex id appears in using a map
where the low 2 bits
+ // represent src and dst
+ val map = new PrimitiveKeyOpenHashMap[VertexId, Byte]
+ edgePartition.srcIds.iterator.foreach { srcId =>
+ map.changeValue(srcId, 0x1, (b: Byte) => (b | 0x1).toByte)
+ }
+ edgePartition.dstIds.iterator.foreach { dstId =>
+ map.changeValue(dstId, 0x2, (b: Byte) => (b | 0x2).toByte)
+ }
+ map.iterator.map { vidAndPosition =>
+ new RoutingTableMessage(vidAndPosition._1, pid, vidAndPosition._2)
+ }
+ }
+
+ /** Build a `RoutingTablePartition` from `RoutingTableMessage`s. */
+ def fromMsgs(numEdgePartitions: Int, iter: Iterator[RoutingTableMessage])
+ : RoutingTablePartition = {
+ val pid2vid = Array.fill(numEdgePartitions)(new
PrimitiveVector[VertexId])
+ val srcFlags = Array.fill(numEdgePartitions)(new
PrimitiveVector[Boolean])
--- End diff --
Use Scala BitSet, which is auto-resizing, avoiding the copy
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