Github user GrahamDennis commented on the pull request:
https://github.com/apache/spark/pull/1948#issuecomment-52257770
I haven't worked out why yet, but this fails an updated version of the test
that I added to my PR:
(KryoSerializerDistributedSuite.scala)
```scala
/*
* 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 org.apache.spark.util.Utils
import com.esotericsoftware.kryo.Kryo
import org.scalatest.FunSuite
import org.apache.spark.{LocalSparkContext, SparkConf, SparkContext,
SparkEnv, TestUtils}
import org.apache.spark.SparkContext._
import org.apache.spark.serializer.KryoDistributedTest._
class KryoSerializerDistributedSuite extends FunSuite {
test("kryo objects are serialised consistently in different processes") {
val conf = new SparkConf(false)
conf.set("spark.serializer",
"org.apache.spark.serializer.KryoSerializer")
conf.set("spark.kryo.registrator", classOf[AppJarRegistrator].getName)
conf.set("spark.task.maxFailures", "1")
val jar =
TestUtils.createJarWithClasses(List(AppJarRegistrator.customClassName))
conf.setJars(List(jar.getPath))
val sc = new SparkContext("local-cluster[2,1,512]", "test", conf)
val original = Thread.currentThread.getContextClassLoader
val loader = new java.net.URLClassLoader(Array(jar),
Utils.getContextOrSparkClassLoader)
SparkEnv.get.serializer.setDefaultClassLoader(loader)
val cachedRDD = sc.parallelize((0 until 10).map((_, new
MyCustomClass)), 3).cache()
// Randomly mix the keys so that the join below will require a shuffle
with each partition
// sending data to multiple other partitions.
val shuffledRDD = cachedRDD.map { case (i, o) => (i * i * i - 10 * i *
i, o)}
// Join the two RDDs, and force evaluation
assert(shuffledRDD.join(cachedRDD).collect.size == 1)
LocalSparkContext.stop(sc)
}
}
object KryoDistributedTest {
class MyCustomClass
class AppJarRegistrator extends KryoRegistrator {
override def registerClasses(k: Kryo) {
val classLoader = Thread.currentThread.getContextClassLoader
k.register(Class.forName(AppJarRegistrator.customClassName, true,
classLoader))
}
}
object AppJarRegistrator {
val customClassName = "KryoSerializerDistributedSuiteCustomClass"
}
}
```
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