Github user zsxwing commented on a diff in the pull request: https://github.com/apache/spark/pull/9143#discussion_r44310128 --- Diff: streaming/src/main/scala/org/apache/spark/streaming/scheduler/ReceiverTracker.scala --- @@ -488,7 +493,24 @@ class ReceiverTracker(ssc: StreamingContext, skipReceiverLaunch: Boolean = false registerReceiver(streamId, typ, host, executorId, receiverEndpoint, context.senderAddress) context.reply(successful) case AddBlock(receivedBlockInfo) => - context.reply(addBlock(receivedBlockInfo)) + if (WriteAheadLogUtils.isBatchingEnabled(ssc.conf, isDriver = true)) { + val f = Future { + if (active) { + addBlock(receivedBlockInfo) + } else { + throw new IllegalStateException("Receiver Tracker Endpoint shut down.") + } + }(walBatchingThreadPool) + f.onComplete { result => + if (active) { + context.reply(result.get) --- End diff -- It's better to log the error. Otherwise, it will just output the std err. See https://github.com/scala/scala/blob/a6e77f721921d9e2569433761a1e6a4056ae10f8/src/library/scala/concurrent/ExecutionContext.scala#L177 Actually, I suggest rewriting these codes like: ```Scala walBatchingThreadPool.execute(new Runnable { override def run(): Unit = Utils.tryLogNonFatalError{ if (active) { context.reply(addBlock(receivedBlockInfo)) } else { throw new IllegalStateException("Receiver Tracker Endpoint shut down.") } } }) ``` This is much simpler
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