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/*
* 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, ClassTag}
import org.apache.spark.SparkContext._
import org.apache.spark.graphx._
import org.apache.spark.rdd.RDD
/**
* Manages shipping vertex attributes to the edge partitions of an
* [[org.apache.spark.graphx.EdgeRDD]]. Vertex attributes may be partially shipped to construct a
* triplet view with vertex attributes on only one side, and they may be updated. An active vertex
* set may additionally be shipped to the edge partitions. Be careful not to store a reference to
* `edges`, since it may be modified when the attribute shipping level is upgraded.
*/
private[impl]
class ReplicatedVertexView[VD: ClassTag, ED: ClassTag](
var edges: EdgeRDDImpl[ED, VD],
var hasSrcId: Boolean = false,
var hasDstId: Boolean = false) {
/**
* Return a new `ReplicatedVertexView` with the specified `EdgeRDD`, which must have the same
* shipping level.
*/
def withEdges[VD2: ClassTag, ED2: ClassTag](
_edges: EdgeRDDImpl[ED2, VD2]): ReplicatedVertexView[VD2, ED2] = {
new ReplicatedVertexView(_edges, hasSrcId, hasDstId)
}
/**
* Return a new `ReplicatedVertexView` where edges are reversed and shipping levels are swapped to
* match.
*/
def reverse(): ReplicatedVertexView[VD, ED] = {
val newEdges = edges.mapEdgePartitions((pid, part) => part.reverse)
new ReplicatedVertexView(newEdges, hasDstId, hasSrcId)
}
/**
* Upgrade the shipping level in-place to the specified levels by shipping vertex attributes from
* `vertices`. This operation modifies the `ReplicatedVertexView`, and callers can access `edges`
* afterwards to obtain the upgraded view.
*/
def upgrade(vertices: VertexRDD[VD], includeSrc: Boolean, includeDst: Boolean) {
val shipSrc = includeSrc && !hasSrcId
val shipDst = includeDst && !hasDstId
if (shipSrc || shipDst) {
val shippedVerts: RDD[(Int, VertexAttributeBlock[VD])] =
vertices.shipVertexAttributes(shipSrc, shipDst)
.setName("ReplicatedVertexView.upgrade(%s, %s) - shippedVerts %s %s (broadcast)".format(
includeSrc, includeDst, shipSrc, shipDst))
.partitionBy(edges.partitioner.get)
val newEdges = edges.withPartitionsRDD(edges.partitionsRDD.zipPartitions(shippedVerts) {
(ePartIter, shippedVertsIter) => ePartIter.map {
case (pid, edgePartition) =>
(pid, edgePartition.updateVertices(shippedVertsIter.flatMap(_._2.iterator)))
}
})
edges = newEdges
hasSrcId = includeSrc
hasDstId = includeDst
}
}
/**
* Return a new `ReplicatedVertexView` where the `activeSet` in each edge partition contains only
* vertex ids present in `actives`. This ships a vertex id to all edge partitions where it is
* referenced, ignoring the attribute shipping level.
*/
def withActiveSet(actives: VertexRDD[_]): ReplicatedVertexView[VD, ED] = {
val shippedActives = actives.shipVertexIds()
.setName("ReplicatedVertexView.withActiveSet - shippedActives (broadcast)")
.partitionBy(edges.partitioner.get)
val newEdges = edges.withPartitionsRDD(edges.partitionsRDD.zipPartitions(shippedActives) {
(ePartIter, shippedActivesIter) => ePartIter.map {
case (pid, edgePartition) =>
(pid, edgePartition.withActiveSet(shippedActivesIter.flatMap(_._2.iterator)))
}
})
new ReplicatedVertexView(newEdges, hasSrcId, hasDstId)
}
/**
* Return a new `ReplicatedVertexView` where vertex attributes in edge partition are updated using
* `updates`. This ships a vertex attribute only to the edge partitions where it is in the
* position(s) specified by the attribute shipping level.
*/
def updateVertices(updates: VertexRDD[VD]): ReplicatedVertexView[VD, ED] = {
val shippedVerts = updates.shipVertexAttributes(hasSrcId, hasDstId)
.setName("ReplicatedVertexView.updateVertices - shippedVerts %s %s (broadcast)".format(
hasSrcId, hasDstId))
.partitionBy(edges.partitioner.get)
val newEdges = edges.withPartitionsRDD(edges.partitionsRDD.zipPartitions(shippedVerts) {
(ePartIter, shippedVertsIter) => ePartIter.map {
case (pid, edgePartition) =>
(pid, edgePartition.updateVertices(shippedVertsIter.flatMap(_._2.iterator)))
}
})
new ReplicatedVertexView(newEdges, hasSrcId, hasDstId)
}
}
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