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SerializerPropertiesSuite.scala
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SerializerPropertiesSuite.scala
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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.serializer
import java.io.{ByteArrayInputStream, ByteArrayOutputStream}
import scala.util.Random
import org.scalatest.Assertions
import org.apache.spark.{SparkConf, SparkFunSuite}
import org.apache.spark.internal.config.Kryo._
import org.apache.spark.serializer.KryoTest.RegistratorWithoutAutoReset
/**
* Tests to ensure that [[Serializer]] implementations obey the API contracts for methods that
* describe properties of the serialized stream, such as
* `Serializer.supportsRelocationOfSerializedObjects`.
*/
class SerializerPropertiesSuite extends SparkFunSuite {
import SerializerPropertiesSuite._
test("JavaSerializer does not support relocation") {
// Per a comment on the SPARK-4550 JIRA ticket, Java serialization appears to write out the
// full class name the first time an object is written to an output stream, but subsequent
// references to the class write a more compact identifier; this prevents relocation.
val ser = new JavaSerializer(new SparkConf())
testSupportsRelocationOfSerializedObjects(ser, generateRandomItem)
}
test("KryoSerializer supports relocation when auto-reset is enabled") {
val ser = new KryoSerializer(new SparkConf)
assert(ser.newInstance().asInstanceOf[KryoSerializerInstance].getAutoReset())
testSupportsRelocationOfSerializedObjects(ser, generateRandomItem)
}
test("KryoSerializer does not support relocation when auto-reset is disabled") {
val conf = new SparkConf().set(KRYO_USER_REGISTRATORS,
Seq(classOf[RegistratorWithoutAutoReset].getName))
val ser = new KryoSerializer(conf)
assert(!ser.newInstance().asInstanceOf[KryoSerializerInstance].getAutoReset())
testSupportsRelocationOfSerializedObjects(ser, generateRandomItem)
}
}
object SerializerPropertiesSuite extends Assertions {
def generateRandomItem(rand: Random): Any = {
val randomFunctions: Seq[() => Any] = Seq(
() => rand.nextInt(),
() => rand.nextString(rand.nextInt(10)),
() => rand.nextDouble(),
() => rand.nextBoolean(),
() => (rand.nextInt(), rand.nextString(rand.nextInt(10))),
() => MyCaseClass(rand.nextInt(), rand.nextString(rand.nextInt(10))),
() => {
val x = MyCaseClass(rand.nextInt(), rand.nextString(rand.nextInt(10)))
(x, x)
}
)
randomFunctions(rand.nextInt(randomFunctions.size)).apply()
}
def testSupportsRelocationOfSerializedObjects(
serializer: Serializer,
generateRandomItem: Random => Any): Unit = {
if (!serializer.supportsRelocationOfSerializedObjects) {
return
}
val NUM_TRIALS = 5
val rand = new Random(42)
for (_ <- 1 to NUM_TRIALS) {
val items = {
// Make sure that we have duplicate occurrences of the same object in the stream:
val randomItems = Seq.fill(10)(generateRandomItem(rand))
randomItems ++ randomItems.take(5)
}
val baos = new ByteArrayOutputStream()
val serStream = serializer.newInstance().serializeStream(baos)
def serializeItem(item: Any): Array[Byte] = {
val itemStartOffset = baos.toByteArray.length
serStream.writeObject(item)
serStream.flush()
val itemEndOffset = baos.toByteArray.length
baos.toByteArray.slice(itemStartOffset, itemEndOffset).clone()
}
val itemsAndSerializedItems: Seq[(Any, Array[Byte])] = {
val serItems = items.map {
item => (item, serializeItem(item))
}
serStream.close()
rand.shuffle(serItems)
}
val reorderedSerializedData: Array[Byte] = itemsAndSerializedItems.flatMap(_._2).toArray
val deserializedItemsStream = serializer.newInstance().deserializeStream(
new ByteArrayInputStream(reorderedSerializedData))
assert(deserializedItemsStream.asIterator.toSeq === itemsAndSerializedItems.map(_._1))
deserializedItemsStream.close()
}
}
}
private case class MyCaseClass(foo: Int, bar: String)