Github user vanzin commented on a diff in the pull request:
https://github.com/apache/spark/pull/1195#discussion_r14308000
--- Diff:
streaming/src/main/scala/org/apache/spark/streaming/receiver/BlockGenerator.scala
---
@@ -58,6 +66,11 @@ private[streaming] class BlockGenerator(
@volatile private var currentBuffer = new ArrayBuffer[Any]
@volatile private var stopped = false
+ private var currentBlockId: StreamBlockId = StreamBlockId(receiverId,
+ clock.currentTime() - blockInterval)
+
+ // Removes might happen from the map while other threads are inserting.
--- End diff --
Ah, I missed the synchronized in the `store()` method.
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