Github user uncleGen commented on a diff in the pull request:
https://github.com/apache/spark/pull/16052#discussion_r90191009
--- Diff:
streaming/src/test/scala/org/apache/spark/streaming/StreamingContextSuite.scala
---
@@ -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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