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package spark.bagel
import org.scalatest.{FunSuite, Assertions, BeforeAndAfter}
import org.scalatest.concurrent.Timeouts
import org.scalatest.time.SpanSugar._
import scala.collection.mutable.ArrayBuffer
import spark._
import storage.StorageLevel
class TestVertex(val active: Boolean, val age: Int) extends Vertex with Serializable
class TestMessage(val targetId: String) extends Message[String] with Serializable
class BagelSuite extends FunSuite with Assertions with BeforeAndAfter with Timeouts {
var sc: SparkContext = _
after {
if (sc != null) {
sc.stop()
sc = null
}
// To avoid Akka rebinding to the same port, since it doesn't unbind immediately on shutdown
System.clearProperty("spark.driver.port")
System.clearProperty("spark.hostPort")
}
test("halting by voting") {
sc = new SparkContext("local", "test")
val verts = sc.parallelize(Array("a", "b", "c", "d").map(id => (id, new TestVertex(true, 0))))
val msgs = sc.parallelize(Array[(String, TestMessage)]())
val numSupersteps = 5
val result =
Bagel.run(sc, verts, msgs, sc.defaultParallelism) {
(self: TestVertex, msgs: Option[Array[TestMessage]], superstep: Int) =>
(new TestVertex(superstep < numSupersteps - 1, self.age + 1), Array[TestMessage]())
}
for ((id, vert) <- result.collect) {
assert(vert.age === numSupersteps)
}
}
test("halting by message silence") {
sc = new SparkContext("local", "test")
val verts = sc.parallelize(Array("a", "b", "c", "d").map(id => (id, new TestVertex(false, 0))))
val msgs = sc.parallelize(Array("a" -> new TestMessage("a")))
val numSupersteps = 5
val result =
Bagel.run(sc, verts, msgs, sc.defaultParallelism) {
(self: TestVertex, msgs: Option[Array[TestMessage]], superstep: Int) =>
val msgsOut =
msgs match {
case Some(ms) if (superstep < numSupersteps - 1) =>
ms
case _ =>
Array[TestMessage]()
}
(new TestVertex(self.active, self.age + 1), msgsOut)
}
for ((id, vert) <- result.collect) {
assert(vert.age === numSupersteps)
}
}
test("large number of iterations") {
// This tests whether jobs with a large number of iterations finish in a reasonable time,
// because non-memoized recursion in RDD or DAGScheduler used to cause them to hang
failAfter(10 seconds) {
sc = new SparkContext("local", "test")
val verts = sc.parallelize((1 to 4).map(id => (id.toString, new TestVertex(true, 0))))
val msgs = sc.parallelize(Array[(String, TestMessage)]())
val numSupersteps = 50
val result =
Bagel.run(sc, verts, msgs, sc.defaultParallelism) {
(self: TestVertex, msgs: Option[Array[TestMessage]], superstep: Int) =>
(new TestVertex(superstep < numSupersteps - 1, self.age + 1), Array[TestMessage]())
}
for ((id, vert) <- result.collect) {
assert(vert.age === numSupersteps)
}
}
}
test("using non-default persistence level") {
failAfter(10 seconds) {
sc = new SparkContext("local", "test")
val verts = sc.parallelize((1 to 4).map(id => (id.toString, new TestVertex(true, 0))))
val msgs = sc.parallelize(Array[(String, TestMessage)]())
val numSupersteps = 50
val result =
Bagel.run(sc, verts, msgs, sc.defaultParallelism, StorageLevel.DISK_ONLY) {
(self: TestVertex, msgs: Option[Array[TestMessage]], superstep: Int) =>
(new TestVertex(superstep < numSupersteps - 1, self.age + 1), Array[TestMessage]())
}
for ((id, vert) <- result.collect) {
assert(vert.age === numSupersteps)
}
}
}
}
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