Github user sryza commented on a diff in the pull request: https://github.com/apache/spark/pull/4258#discussion_r23855340 --- Diff: core/src/main/scala/org/apache/spark/serializer/KryoSerializer.scala --- @@ -97,7 +87,9 @@ class KryoSerializer(conf: SparkConf) // Use the default classloader when calling the user registrator. Thread.currentThread.setContextClassLoader(classLoader) // Register classes given through spark.kryo.classesToRegister. - classesToRegister.foreach { clazz => kryo.register(clazz) } + classesToRegister.split(',') --- End diff -- Can we do the splitting and filtering during initialization so that we don't incur them for each task?
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