Github user mateiz commented on a diff in the pull request:

    https://github.com/apache/spark/pull/12913#discussion_r84570152
  
    --- Diff: 
core/src/test/scala/org/apache/spark/serializer/UnsafeKryoSerializerSuite.scala 
---
    @@ -0,0 +1,28 @@
    +/*
    + * 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
    +
    +class UnsafeKryoSerializerSuite extends KryoSerializerSuite {
    +
    +  // This test suite should run all tests in KryoSerializerSuite with kryo 
unsafe.
    +
    +  override def beforeAll() {
    +    super.beforeAll()
    +    conf.set("spark.kryo.unsafe", "true")
    --- End diff --
    
    Have you checked that this runs in the right order w.r.t. the code that 
initializes a SparkContext in KryoSerializerSuite / SharedSparkContext? You may 
want to print sc.conf in a test. Otherwise, it would be better to put 
conf.set("spark.kryo.unsafe", "true") at the top-level inside this class. 
SharedSparkContext does create a SparkContext in its beforeAll, but you seem to 
editing the conf after that is done.


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