Github user zsxwing commented on a diff in the pull request: https://github.com/apache/spark/pull/4467#discussion_r29704468 --- Diff: streaming/src/main/scala/org/apache/spark/streaming/scheduler/ReceiverTracker.scala --- @@ -81,12 +112,14 @@ class ReceiverTracker(ssc: StreamingContext, skipReceiverLaunch: Boolean = false "ReceiverTracker", new ReceiverTrackerEndpoint(ssc.env.rpcEnv)) if (!skipReceiverLaunch) receiverExecutor.start() logInfo("ReceiverTracker started") + trackerState = Started } } /** Stop the receiver execution thread. */ def stop(graceful: Boolean): Unit = synchronized { - if (!receiverInputStreams.isEmpty && endpoint != null) { + if (isTrackerStarted) { + trackerState = Stopping --- End diff -- > changing trackerState to Stopping and calling stopReceivers() should be atomic, or it's still possible that StopReceiver won't be sent because the registerReceiver method runs in another thread. Oh, I see. `ReceiverStarted` will be rejected and force the receiver stop. It's really tricky. Do you think we can solve this issue without `ReceiverStarted`
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