Github user vanzin commented on a diff in the pull request:
https://github.com/apache/spark/pull/21451#discussion_r198652991
--- Diff:
core/src/main/scala/org/apache/spark/network/BlockDataManager.scala ---
@@ -43,6 +44,17 @@ trait BlockDataManager {
level: StorageLevel,
classTag: ClassTag[_]): Boolean
+ /**
+ * Put the given block that will be received as a stream.
+ *
+ * When this method is called, the data itself is not available -- it
needs to be handled within
+ * the callbacks of <code>streamData</code>.
--- End diff --
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