Github user srowen commented on a diff in the pull request:
https://github.com/apache/spark/pull/15618#discussion_r85663718
--- Diff:
streaming/src/main/scala/org/apache/spark/streaming/scheduler/ReceiverTracker.scala
---
@@ -202,18 +206,21 @@ class ReceiverTracker(ssc: StreamingContext,
skipReceiverLaunch: Boolean = false
/** Allocate all unallocated blocks to the given batch. */
def allocateBlocksToBatch(batchTime: Time): Unit = {
+ require(receivedBlockTracker != null, "ReceiverTracker should be
started first.")
--- End diff --
Per comments above, I don't know if you need to assert about the state
here. I suppose you'll already get an error if this isn't true, but, this would
indicate something else already went wrong.
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