Github user zsxwing commented on a diff in the pull request:
https://github.com/apache/spark/pull/4588#discussion_r26100032
--- Diff: core/src/main/scala/org/apache/spark/rpc/RpcEnv.scala ---
@@ -0,0 +1,370 @@
+/*
+ * 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
+
+import java.net.URI
+
+import scala.concurrent.Future
+import scala.concurrent.duration.FiniteDuration
+import scala.reflect.ClassTag
+
+import org.apache.spark.{SparkException, SecurityManager, SparkConf}
+import org.apache.spark.util.Utils
+
+/**
+ * An RPC environment. [[RpcEndpoint]]s need to register itself with a
name to [[RpcEnv]] to
+ * receives messages. Then [[RpcEnv]] will process messages sent from
[[RpcEndpointRef]] or remote
+ * nodes, and deliver them to corresponding [[RpcEndpoint]]s.
+ *
+ * [[RpcEnv]] also provides some methods to retrieve [[RpcEndpointRef]]s
given name or uri.
+ */
+private[spark] trait RpcEnv {
+
+ /**
+ * Return RpcEndpointRef of the registered [[RpcEndpoint]]. Will be used
to implement
+ * [[RpcEndpoint.self]].
+ */
+ private[rpc] def endpointRef(endpoint: RpcEndpoint): RpcEndpointRef
+
+ /**
+ * Return the address that [[RpcEnv]] is listening to.
+ */
+ def address: RpcAddress
+
+ /**
+ * Register a [[RpcEndpoint]] with a name and return its
[[RpcEndpointRef]]. [[RpcEnv]] does not
+ * guarantee thread-safety.
+ */
+ def setupEndpoint(name: String, endpoint: RpcEndpoint): RpcEndpointRef
+
+ /**
+ * Register a [[RpcEndpoint]] with a name and return its
[[RpcEndpointRef]]. [[RpcEnv]] should
+ * make sure thread-safely sending messages to [[RpcEndpoint]].
+ */
+ def setupThreadSafeEndpoint(name: String, endpoint: RpcEndpoint):
RpcEndpointRef
+
+ /**
+ * Retrieve a [[RpcEndpointRef]] which is located in the driver via its
name.
+ */
+ def setupDriverEndpointRef(name: String): RpcEndpointRef
+
+ /**
+ * Retrieve the [[RpcEndpointRef]] represented by `url`.
+ */
+ def setupEndpointRefByUrl(url: String): RpcEndpointRef
+
+ /**
+ * Retrieve the [[RpcEndpointRef]] represented by `systemName`,
`address` and `endpointName`
--- End diff --
Actually, `systemName` is a Akka concept. A uri to create ActorRef should
contain the system name. Here is an example of a Akka ActorRef uri:
`akka.tcp://systemname@host:port/user/actorname`
In the current codes, Spark use different system names for different
processes. E.g., Master uses `sparkMaster`, Worker i uses `"sparkWorker" + i`,
Driver uses `sparkDriver`.
Because `systemName` is necessary for `ActorRef`, I cannot remove it from
RPC even if it won't be used for other RPC implementation.
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