Github user cloud-fan commented on a diff in the pull request:

    https://github.com/apache/spark/pull/19661#discussion_r149012452
  
    --- Diff: 
core/src/main/scala/org/apache/spark/serializer/KryoSerializer.scala ---
    @@ -178,10 +178,31 @@ class KryoSerializer(conf: SparkConf)
         
kryo.register(Utils.classForName("scala.collection.immutable.Map$EmptyMap$"))
         kryo.register(classOf[ArrayBuffer[Any]])
     
    +    // We can't load those class directly in order to avoid unnecessary 
jar dependencies.
    +    // We load them safely, ignore it if the class not found.
    +    
safeClassLoader("org.apache.spark.mllib.linalg.Vector").foreach(kryo.register(_))
    --- End diff --
    
    I don't have a strong objection to this, it's a little hacky though. cc 
@srowen 


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