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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
import org.scalatest.FunSuite
import org.scalatest.matchers.ShouldMatchers
import collection.mutable
import java.util.Random
import scala.math.exp
import scala.math.signum
import org.apache.spark.SparkContext._
class AccumulatorSuite extends FunSuite with ShouldMatchers with LocalSparkContext {
implicit def setAccum[A] = new AccumulableParam[mutable.Set[A], A] {
def addInPlace(t1: mutable.Set[A], t2: mutable.Set[A]) : mutable.Set[A] = {
t1 ++= t2
t1
}
def addAccumulator(t1: mutable.Set[A], t2: A) : mutable.Set[A] = {
t1 += t2
t1
}
def zero(t: mutable.Set[A]) : mutable.Set[A] = {
new mutable.HashSet[A]()
}
}
test ("basic accumulation"){
sc = new SparkContext("local", "test")
val acc : Accumulator[Int] = sc.accumulator(0)
val d = sc.parallelize(1 to 20)
d.foreach{x => acc += x}
acc.value should be (210)
val longAcc = sc.accumulator(0l)
val maxInt = Integer.MAX_VALUE.toLong
d.foreach{x => longAcc += maxInt + x}
longAcc.value should be (210l + maxInt * 20)
}
test ("value not assignable from tasks") {
sc = new SparkContext("local", "test")
val acc : Accumulator[Int] = sc.accumulator(0)
val d = sc.parallelize(1 to 20)
evaluating {d.foreach{x => acc.value = x}} should produce [Exception]
}
test ("add value to collection accumulators") {
val maxI = 1000
for (nThreads <- List(1, 10)) { //test single & multi-threaded
sc = new SparkContext("local[" + nThreads + "]", "test")
val acc: Accumulable[mutable.Set[Any], Any] = sc.accumulable(new mutable.HashSet[Any]())
val d = sc.parallelize(1 to maxI)
d.foreach {
x => acc += x
}
val v = acc.value.asInstanceOf[mutable.Set[Int]]
for (i <- 1 to maxI) {
v should contain(i)
}
resetSparkContext()
}
}
test ("value not readable in tasks") {
val maxI = 1000
for (nThreads <- List(1, 10)) { //test single & multi-threaded
sc = new SparkContext("local[" + nThreads + "]", "test")
val acc: Accumulable[mutable.Set[Any], Any] = sc.accumulable(new mutable.HashSet[Any]())
val d = sc.parallelize(1 to maxI)
evaluating {
d.foreach {
x => acc.value += x
}
} should produce [SparkException]
resetSparkContext()
}
}
test ("collection accumulators") {
val maxI = 1000
for (nThreads <- List(1, 10)) {
// test single & multi-threaded
sc = new SparkContext("local[" + nThreads + "]", "test")
val setAcc = sc.accumulableCollection(mutable.HashSet[Int]())
val bufferAcc = sc.accumulableCollection(mutable.ArrayBuffer[Int]())
val mapAcc = sc.accumulableCollection(mutable.HashMap[Int,String]())
val d = sc.parallelize((1 to maxI) ++ (1 to maxI))
d.foreach {
x => {setAcc += x; bufferAcc += x; mapAcc += (x -> x.toString)}
}
// Note that this is typed correctly -- no casts necessary
setAcc.value.size should be (maxI)
bufferAcc.value.size should be (2 * maxI)
mapAcc.value.size should be (maxI)
for (i <- 1 to maxI) {
setAcc.value should contain(i)
bufferAcc.value should contain(i)
mapAcc.value should contain (i -> i.toString)
}
resetSparkContext()
}
}
test ("localValue readable in tasks") {
val maxI = 1000
for (nThreads <- List(1, 10)) { //test single & multi-threaded
sc = new SparkContext("local[" + nThreads + "]", "test")
val acc: Accumulable[mutable.Set[Any], Any] = sc.accumulable(new mutable.HashSet[Any]())
val groupedInts = (1 to (maxI/20)).map {x => (20 * (x - 1) to 20 * x).toSet}
val d = sc.parallelize(groupedInts)
d.foreach {
x => acc.localValue ++= x
}
acc.value should be ( (0 to maxI).toSet)
resetSparkContext()
}
}
}
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