Github user zsxwing commented on a diff in the pull request:
https://github.com/apache/spark/pull/6457#discussion_r39757885
--- Diff: core/src/main/scala/org/apache/spark/rpc/netty/Dispatcher.scala
---
@@ -0,0 +1,226 @@
+/*
+ * 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.util.concurrent.{ConcurrentHashMap, LinkedBlockingQueue,
TimeUnit}
+import javax.annotation.concurrent.GuardedBy
+
+import scala.collection.JavaConverters._
+import scala.concurrent.Promise
+import scala.util.control.NonFatal
+
+import org.apache.spark.{SparkException, Logging}
+import org.apache.spark.network.client.RpcResponseCallback
+import org.apache.spark.rpc._
+import org.apache.spark.util.ThreadUtils
+
+private class RpcEndpointPair(val endpoint: RpcEndpoint, val endpointRef:
NettyRpcEndpointRef)
+
+private[netty] class Dispatcher(nettyEnv: NettyRpcEnv) extends Logging {
+
+ private val endpointToInbox = new ConcurrentHashMap[RpcEndpoint, Inbox]()
--- End diff --
`nameToEndpoint` is necessary obviously.
`endpointToEndpointRef` is used to search RpcEndpointRef via RpcEndpoint.
RpcEndpoint doesn't have a name field, so we need a map that uses `RpcEndpoint`
as key.
Moreover, the items in these 3 Maps are removed in different phase. Items
`nameToEndpoint` are removed when `unregisterRpcEndpoint` is called. Items in
`endpointToEndpointRef` are removed just before calling `endpoint.onStop()`.
Items in `endpointToInbox` are removed when Inbox.process return true.
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