Github user aarondav commented on a diff in the pull request:
https://github.com/apache/spark/pull/4588#discussion_r27348715
--- Diff: core/src/main/scala/org/apache/spark/rpc/akka/AkkaRpcEnv.scala ---
@@ -0,0 +1,321 @@
+/*
+ * 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.akka
+
+import java.net.URI
+import java.util.concurrent.ConcurrentHashMap
+
+import scala.concurrent.{Await, Future}
+import scala.concurrent.duration._
+import scala.language.postfixOps
+import scala.reflect.ClassTag
+import scala.util.control.NonFatal
+
+import akka.actor.{ActorSystem, ExtendedActorSystem, Actor, ActorRef,
Props, Address}
+import akka.pattern.{ask => akkaAsk}
+import akka.remote.{AssociationEvent, AssociatedEvent, DisassociatedEvent,
AssociationErrorEvent}
+import org.apache.spark.{SparkException, Logging, SparkConf}
+import org.apache.spark.rpc._
+import org.apache.spark.util.{ActorLogReceive, AkkaUtils}
+
+/**
+ * A RpcEnv implementation based on Akka.
+ *
+ * TODO Once we remove all usages of Akka in other place, we can move this
file to a new project and
+ * remove Akka from the dependencies.
+ *
+ * @param actorSystem
+ * @param conf
+ * @param boundPort
+ */
+private[spark] class AkkaRpcEnv private[akka] (
+ val actorSystem: ActorSystem, conf: SparkConf, boundPort: Int)
+ extends RpcEnv(conf) with Logging {
+
+ private val defaultAddress: RpcAddress = {
+ val address =
actorSystem.asInstanceOf[ExtendedActorSystem].provider.getDefaultAddress
+ // In some test case, ActorSystem doesn't bind to any address.
+ // So just use some default value since they are only some unit tests
+ RpcAddress(address.host.getOrElse("localhost"),
address.port.getOrElse(boundPort))
+ }
+
+ override val address: RpcAddress = defaultAddress
+
+ /**
+ * A lookup table to search a [[RpcEndpointRef]] for a [[RpcEndpoint]].
We need it to make
+ * [[RpcEndpoint.self]] work.
+ */
+ private val endpointToRef = new ConcurrentHashMap[RpcEndpoint,
RpcEndpointRef]()
+
+ /**
+ * Need this map to remove `RpcEndpoint` from `endpointToRef` via a
`RpcEndpointRef`
+ */
+ private val refToEndpoint = new ConcurrentHashMap[RpcEndpointRef,
RpcEndpoint]()
+
+ private def registerEndpoint(endpoint: RpcEndpoint, endpointRef:
RpcEndpointRef): Unit = {
+ endpointToRef.put(endpoint, endpointRef)
+ refToEndpoint.put(endpointRef, endpoint)
+ }
+
+ private def unregisterEndpoint(endpointRef: RpcEndpointRef): Unit = {
+ val endpoint = refToEndpoint.remove(endpointRef)
+ if (endpoint != null) {
+ endpointToRef.remove(endpoint)
+ }
+ }
+
+ /**
+ * Retrieve the [[RpcEndpointRef]] of `endpoint`.
+ */
+ override def endpointRef(endpoint: RpcEndpoint): RpcEndpointRef = {
+ val endpointRef = endpointToRef.get(endpoint)
+ require(endpointRef != null, s"Cannot find RpcEndpointRef of
${endpoint} in ${this}")
+ endpointRef
+ }
+
+ override def setupEndpoint(name: String, endpoint: RpcEndpoint):
RpcEndpointRef = {
+ setupThreadSafeEndpoint(name, endpoint)
+ }
+
+ override def setupThreadSafeEndpoint(name: String, endpoint:
RpcEndpoint): RpcEndpointRef = {
+ @volatile var endpointRef: AkkaRpcEndpointRef = null
+ // Use lazy because the Actor needs to use `endpointRef`.
+ // So `actorRef` should be created after assigning `endpointRef`.
+ lazy val actorRef = actorSystem.actorOf(Props(new Actor with
ActorLogReceive with Logging {
+
+ require(endpointRef != null)
--- End diff --
I believe I am missing something here, but what prevents us from invoking
these methods after setting endpointRef (inside setupThreadSafeEndpoint, rather
than the Actor's constructor)? This would mean that the actor is not valid
immediately after construction, but I think the laziness thing is making a
similar requirement.
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