rmcyang commented on a change in pull request #34158:
URL: https://github.com/apache/spark/pull/34158#discussion_r720570913



##########
File path: core/src/main/scala/org/apache/spark/util/Utils.scala
##########
@@ -2603,17 +2603,18 @@ 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, 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(Utils.classForName(conf.get(SERIALIZER)).getConstructor(classOf[SparkConf])

Review comment:
       Ack




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