1 files changed, 39 insertions, 0 deletions
diff --git a/core/src/main/scala/org/apache/spark/rpc/netty/IDVerifier.scala b/core/src/main/scala/org/apache/spark/rpc/netty/IDVerifier.scala
new file mode 100644
index 0000000000..6061c9b8de
--- /dev/null
+++ b/core/src/main/scala/org/apache/spark/rpc/netty/IDVerifier.scala
@@ -0,0 +1,39 @@
+/*
+ * 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 org.apache.spark.rpc.{RpcCallContext, RpcEndpoint, RpcEnv}
+
+/**
+ * A message used to ask the remote [[IDVerifier]] if an [[RpcEndpoint]] exists
+ */
+private[netty] case class ID(name: String)
+
+/**
+ * An [[RpcEndpoint]] for remote [[RpcEnv]]s to query if a [[RpcEndpoint]] exists in this [[RpcEnv]]
+ */
+private[netty] class IDVerifier(
+    override val rpcEnv: RpcEnv, dispatcher: Dispatcher) extends RpcEndpoint {
+
+  override def receiveAndReply(context: RpcCallContext): PartialFunction[Any, Unit] = {
+    case ID(name) => context.reply(dispatcher.verify(name))
+  }
+}
+
+private[netty] object IDVerifier {
+  val NAME = "id-verifier"
+}