Github user uncleGen commented on a diff in the pull request:
    --- Diff: 
    @@ -869,6 +891,31 @@ object TestReceiver {
       val counter = new AtomicInteger(1)
    +class FakeByteArrayReceiver extends 
Receiver[Array[Byte]](StorageLevel.MEMORY_ONLY) with Logging {
    --- End diff --
    @zsxwing yes, failure occurs when receiver store `Array[Byte]` data and the 
automatic serializer selection would pick JavaSerializer as the type of data  
is erased to be Object . However, after get from remote executor, the 
input-stream data will be deserialized with KryoSerializer as Task could get 
data type properly,  leading to the **com.esotericsoftware.kryo.KryoException: 
Encountered unregistered class ID: 13994**

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