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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
import org.apache.spark.SparkFunSuite
class PregelSuite extends SparkFunSuite with LocalSparkContext {
test("1 iteration") {
withSpark { sc =>
val n = 5
val starEdges = (1 to n).map(x => (0: VertexId, x: VertexId))
val star = Graph.fromEdgeTuples(sc.parallelize(starEdges, 3), "v").cache()
val result = Pregel(star, 0)(
(vid, attr, msg) => attr,
et => Iterator.empty,
(a: Int, b: Int) => throw new Exception("mergeMsg run unexpectedly"))
assert(result.vertices.collect.toSet === star.vertices.collect.toSet)
}
}
test("chain propagation") {
withSpark { sc =>
val n = 5
val chain = Graph.fromEdgeTuples(
sc.parallelize((1 until n).map(x => (x: VertexId, x + 1: VertexId)), 3),
0).cache()
assert(chain.vertices.collect.toSet === (1 to n).map(x => (x: VertexId, 0)).toSet)
val chainWithSeed = chain.mapVertices { (vid, attr) => if (vid == 1) 1 else 0 }.cache()
assert(chainWithSeed.vertices.collect.toSet ===
Set((1: VertexId, 1)) ++ (2 to n).map(x => (x: VertexId, 0)).toSet)
val result = Pregel(chainWithSeed, 0)(
(vid, attr, msg) => math.max(msg, attr),
et => if (et.dstAttr != et.srcAttr) Iterator((et.dstId, et.srcAttr)) else Iterator.empty,
(a: Int, b: Int) => math.max(a, b))
assert(result.vertices.collect.toSet ===
chain.vertices.mapValues { (vid, attr) => attr + 1 }.collect.toSet)
}
}
}
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