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

    https://github.com/apache/spark/pull/21280#discussion_r187192553
  
    --- Diff: 
core/src/test/scala/org/apache/spark/scheduler/SparkListenerSuite.scala ---
    @@ -583,3 +587,23 @@ private class 
FirehoseListenerThatAcceptsSparkConf(conf: SparkConf) extends Spar
         case _ =>
       }
     }
    +
    +private class SlowDeserializable(var readDuration: Int)
    +  extends Externalizable {
    +
    +  def this() = this(0)
    --- End diff --
    
    Nevermind, thinking of `Serializable`.
    
    "When an Externalizable object is reconstructed, an instance is created 
using the public no-arg constructor"


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