Github user zsxwing commented on a diff in the pull request:
https://github.com/apache/spark/pull/7797#discussion_r35885535
--- Diff:
streaming/src/main/scala/org/apache/spark/streaming/scheduler/ReceiverTracker.scala
---
@@ -223,7 +223,11 @@ class ReceiverTracker(ssc: StreamingContext,
skipReceiverLaunch: Boolean = false
// Signal the receivers to delete old block data
if (WriteAheadLogUtils.enableReceiverLog(ssc.conf)) {
logInfo(s"Cleanup old received batch data: $cleanupThreshTime")
- endpoint.send(CleanupOldBlocks(cleanupThreshTime))
--- End diff --
I saw NullPointerException once when I ran the tests a lot of times. The
`JobScheduler.eventLoop` is stopped after `ReceiverTracker.stop` and
`ReceiverTracker.stop` sets `endpoint` to null. Therefore it's possible that
this method is called between `ReceiverTracker.stop` and
`JobScheduler.eventLoop.stop` and will throw NullPointerException.
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