Github user vanzin commented on the pull request: https://github.com/apache/spark/pull/3571#issuecomment-69084905 I mentioned that in my second bullet. Java 6 doesn't have TLSv1.2. After I fix that I get something like this: Exception in thread "Thread-40" java.lang.IllegalStateException: Trying to deserialize a serialized ActorRef without an ActorSystem in scope. Use 'akka.serialization.Serialization.currentSystem.withValue(system) { ... }' at akka.actor.SerializedActorRef.readResolve(ActorRef.scala:407)
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