Github user liyichao commented on a diff in the pull request: https://github.com/apache/spark/pull/18092#discussion_r122620196 --- Diff: core/src/test/scala/org/apache/spark/storage/BlockManagerSuite.scala --- @@ -1281,6 +1286,59 @@ class BlockManagerSuite extends SparkFunSuite with Matchers with BeforeAndAfterE assert(master.getLocations("item").isEmpty) } + test("SPARK-20640: Shuffle registration timeout and maxAttempts conf are working") { + val tryAgainMsg = "test_spark_20640_try_again" + // a server which delays response 50ms and must try twice for success. + def newShuffleServer(port: Int): (TransportServer, Int) = { + val attempts = new mutable.HashMap[String, Int]() + val handler = new NoOpRpcHandler { + override def receive(client: TransportClient, message: ByteBuffer, + callback: RpcResponseCallback): Unit = { + val msgObj = BlockTransferMessage.Decoder.fromByteBuffer(message) + msgObj match { + case exec: RegisterExecutor => + Thread.sleep(50) + val attempt = attempts.getOrElse(exec.execId, 0) + 1 + attempts(exec.execId) = attempt + if (attempt < 2) { + callback.onFailure(new Exception(tryAgainMsg)) + return + } + callback.onSuccess(ByteBuffer.wrap(new Array[Byte](0))) + } + } + } + + val transConf = SparkTransportConf.fromSparkConf(conf, "shuffle", numUsableCores = 0) + val transCtx = new TransportContext(transConf, handler, true) + (transCtx.createServer(port, Seq.empty[TransportServerBootstrap].asJava), port) + } + val candidatePort = RandomUtils.nextInt(1024, 65536) + val (server, shufflePort) = Utils.startServiceOnPort(candidatePort, --- End diff -- No, because `startServiceOnPort` will handle the conflicted port case.
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