Github user vanzin commented on a diff in the pull request:
https://github.com/apache/spark/pull/6457#discussion_r39925279
--- Diff: core/src/main/scala/org/apache/spark/rpc/netty/NettyRpcEnv.scala
---
@@ -0,0 +1,474 @@
+/*
+ * Licensed to the Apache Software Foundation (ASF) under one or more
+ * contributor license agreements. See the NOTICE file distributed with
+ * this work for additional information regarding copyright ownership.
+ * The ASF licenses this file to You under the Apache License, Version 2.0
+ * (the "License"); you may not use this file except in compliance with
+ * the License. You may obtain a copy of the License at
+ *
+ * http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+package org.apache.spark.rpc.netty
+
+import java.io._
+import java.net.{InetSocketAddress, URI}
+import java.nio.ByteBuffer
+import java.util.Arrays
+import java.util.concurrent._
+
+import scala.collection.JavaConverters._
+import scala.collection.mutable
+import scala.concurrent.{Future, Promise}
+import scala.reflect.ClassTag
+import scala.util.{DynamicVariable, Failure, Success}
+import scala.util.control.NonFatal
+
+import org.apache.spark.{Logging, SecurityManager, SparkConf}
+import org.apache.spark.network.TransportContext
+import org.apache.spark.network.client._
+import org.apache.spark.network.netty.SparkTransportConf
+import org.apache.spark.network.sasl.{SaslClientBootstrap,
SaslServerBootstrap}
+import org.apache.spark.network.server._
+import org.apache.spark.rpc._
+import org.apache.spark.serializer.{JavaSerializer, Serializer}
+import org.apache.spark.util.{ThreadUtils, Utils}
+
+private[netty] class NettyRpcEnv(
+ val conf: SparkConf, serializer: Serializer, host: String,
securityManager: SecurityManager)
+ extends RpcEnv(conf) with Logging {
+
+ private val transportConf =
+ SparkTransportConf.fromSparkConf(conf,
conf.getInt("spark.rpc.io.threads", 0))
+
+ private val dispatcher: Dispatcher = new Dispatcher(this)
+
+ private val transportContext =
+ new TransportContext(transportConf, new NettyRpcHandler(dispatcher,
this))
+
+ private val clientFactory = {
+ val bootstraps: Seq[TransportClientBootstrap] =
+ if (securityManager.isAuthenticationEnabled()) {
+ Seq(new SaslClientBootstrap(transportConf, "", securityManager,
+ securityManager.isSaslEncryptionEnabled()))
+ } else {
+ Seq.empty
+ }
+ transportContext.createClientFactory(bootstraps.asJava)
+ }
+
+ val timeoutScheduler =
ThreadUtils.newDaemonSingleThreadScheduledExecutor("netty-rpc-env-timeout")
+
+ private val clientConnectionExecutor =
ThreadUtils.newDaemonCachedThreadPool(
+ "netty-rpc-connection",
+ conf.getInt("spark.rpc.connect.threads", 256))
+
+ @volatile private var server: TransportServer = _
+
+ def start(port: Int): Unit = {
+ val bootstraps: Seq[TransportServerBootstrap] =
+ if (securityManager.isAuthenticationEnabled()) {
+ Seq(new SaslServerBootstrap(transportConf, securityManager))
+ } else {
+ Seq.empty
+ }
+ server = transportContext.createServer(port, bootstraps.asJava)
+ dispatcher.registerRpcEndpoint(IDVerifier.NAME, new IDVerifier(this,
dispatcher))
+ }
+
+ override lazy val address: RpcAddress = {
+ require(server != null, "NettyRpcEnv has not yet started")
+ RpcAddress(host, server.getPort())
+ }
+
+ override def setupEndpoint(name: String, endpoint: RpcEndpoint):
RpcEndpointRef = {
+ dispatcher.registerRpcEndpoint(name, endpoint)
+ }
+
+ def asyncSetupEndpointRefByURI(uri: String): Future[RpcEndpointRef] = {
+ val addr = NettyRpcAddress(uri)
+ val endpointRef = new NettyRpcEndpointRef(conf, addr, this)
+ val idVerifierRef =
+ new NettyRpcEndpointRef(conf, NettyRpcAddress(addr.host, addr.port,
IDVerifier.NAME), this)
+ idVerifierRef.ask[Boolean](ID(endpointRef.name)).flatMap(find =>
+ if (find) {
+ Future.successful(endpointRef)
+ } else {
+ Future.failed(new RpcEndpointNotFoundException(uri))
+ }
+ )(ThreadUtils.sameThread)
+ }
+
+ override def stop(endpointRef: RpcEndpointRef): Unit = {
+ require(endpointRef.isInstanceOf[NettyRpcEndpointRef])
+ dispatcher.stop(endpointRef)
+ }
+
+ private[netty] def send(message: RequestMessage): Unit = {
+ val remoteAddr = message.receiver.address
+ if (remoteAddr == address) {
+ val promise = Promise[Any]()
+ dispatcher.postMessage(message, promise)
+ promise.future.onComplete {
+ case Success(response) =>
+ val ack = response.asInstanceOf[SendAck]
+ logDebug(s"Receive ack from ${ack.sender}")
+ case Failure(e) =>
+ logError(s"Exception when sending $message", e)
+ }(ThreadUtils.sameThread)
+ } else {
+ try {
+ // `createClient` will block if it cannot find a known connection,
so we should run it in
+ // clientConnectionExecutor
+ clientConnectionExecutor.execute(new Runnable {
+ override def run(): Unit = Utils.tryLogNonFatalError {
+ val client = clientFactory.createClient(remoteAddr.host,
remoteAddr.port)
+ client.sendRpc(serialize(message), new RpcResponseCallback {
+
+ override def onFailure(e: Throwable): Unit = {
+ logError(s"Exception when sending $message", e)
+ }
+
+ override def onSuccess(response: Array[Byte]): Unit = {
+ val ack = deserialize[SendAck](response)
+ logDebug(s"Receive ack from ${ack.sender}")
+ }
+ })
+ }
+ })
+ } catch {
+ case e: RejectedExecutionException => {
+ // `send` after shutting clientConnectionExecutor down, ignore it
+ }
+ }
+ }
+ }
+
+ private[netty] def ask(message: RequestMessage): Future[Any] = {
+ val promise = Promise[Any]()
+ val remoteAddr = message.receiver.address
+ if (remoteAddr == address) {
+ val p = Promise[Any]()
+ dispatcher.postMessage(message, p)
+ p.future.onComplete {
+ case Success(response) =>
+ val reply = response.asInstanceOf[AskResponse]
+ if (reply.reply != null && reply.reply.isInstanceOf[RpcFailure])
{
--- End diff --
nit: the null check is not necessary.
scala> null.isInstanceOf[Object]
res0: Boolean = false
Scala can be weird.
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