JoshRosen commented on a change in pull request #34158:
URL: https://github.com/apache/spark/pull/34158#discussion_r721889128



##########
File path: core/src/main/scala/org/apache/spark/util/Utils.scala
##########
@@ -2603,17 +2603,19 @@ private[spark] object Utils extends Logging {
    *   - IO encryption disabled
    *   - serializer(such as KryoSerializer) supports relocation of serialized 
objects
    */
-  def isPushBasedShuffleEnabled(conf: SparkConf): Boolean = {
+  def isPushBasedShuffleEnabled(conf: SparkConf,
+      isDriver: Boolean,
+      checkSerializer: Boolean = true): Boolean = {
     val pushBasedShuffleEnabled = conf.get(PUSH_BASED_SHUFFLE_ENABLED)
     if (pushBasedShuffleEnabled) {
-      val serializer = 
Utils.classForName(conf.get(SERIALIZER)).getConstructor(classOf[SparkConf])
-        .newInstance(conf).asInstanceOf[Serializer]
+      lazy val serializer = Option(SparkEnv.get).map(_.serializer)
+        .getOrElse(instantiateClassFromConf[Serializer](SERIALIZER, conf, 
isDriver))
       val canDoPushBasedShuffle = conf.get(IS_TESTING).getOrElse(false) ||

Review comment:
       @rmcyang, it looks like a few other tests might need similar changes, 
too. For now I'd recommend reverting 585a7ff2384b0dfe9f69e96387229e6fe87a564e 
to unblock this PR and then we can tackle the test-only changes in a followup 
(since it looks like it'll be tricker to fix than I had initially imagined).




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