Github user srowen commented on a diff in the pull request: https://github.com/apache/spark/pull/19661#discussion_r149016829 --- 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 -- It is a little hacky, but not crazy. But rather than this, why not just write here something like... ``` Seq("org.apache...", "...").foreach { className => try { kryo.register(Utils.classForName(className)) } catch { case _: ClassNotFoundException => // do nothing } } ```
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