YARN-5410. Bootstrap Router server module. (Giovanni Matteo Fumarola via Subru).

(cherry picked from commit 04f111394b08de7d16a86f8025221f6f5e0dbcc5)

hadoop-project/pom.xml

@@ -405,6 +405,12 @@
         <version>${project.version}</version>
       </dependency>
 
+      <dependency>
+        <groupId>org.apache.hadoop</groupId>
+        <artifactId>hadoop-yarn-server-router</artifactId>
+        <version>${project.version}</version>
+      </dependency>
+
       <dependency>
         <groupId>org.apache.hadoop</groupId>
          <artifactId>hadoop-mapreduce-client-jobclient</artifactId>

hadoop-yarn-project/hadoop-yarn/hadoop-yarn-server/hadoop-yarn-server-router/pom.xml

@@ -0,0 +1,62 @@
+<?xml version="1.0"?>
+<!--
+  Licensed 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. See accompanying LICENSE file.
+-->
+<project xmlns="http://maven.apache.org/POM/4.0.0"
+  xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
+  xsi:schemaLocation="http://maven.apache.org/POM/4.0.0
+                      http://maven.apache.org/xsd/maven-4.0.0.xsd">
+  <parent>
+    <artifactId>hadoop-yarn-server</artifactId>
+    <groupId>org.apache.hadoop</groupId>
+    <version>3.0.0-alpha3-SNAPSHOT</version>
+  </parent>
+  <modelVersion>4.0.0</modelVersion>
+  <groupId>org.apache.hadoop</groupId>
+  <artifactId>hadoop-yarn-server-router</artifactId>
+  <version>3.0.0-alpha3-SNAPSHOT</version>
+  <name>Apache Hadoop YARN Router</name>
+
+  <properties>
+    <!-- Needed for generating FindBugs warnings using parent pom -->
+    <yarn.basedir>${project.parent.parent.basedir}</yarn.basedir>
+  </properties>
+
+  <dependencies>
+    <dependency>
+      <groupId>org.apache.hadoop</groupId>
+      <artifactId>hadoop-yarn-api</artifactId>
+    </dependency>
+
+    <dependency>
+      <groupId>org.apache.hadoop</groupId>
+      <artifactId>hadoop-common</artifactId>
+    </dependency>
+
+    <dependency>
+      <groupId>org.apache.hadoop</groupId>
+      <artifactId>hadoop-yarn-common</artifactId>
+    </dependency>
+
+    <dependency>
+      <groupId>org.apache.hadoop</groupId>
+      <artifactId>hadoop-yarn-server-common</artifactId>
+    </dependency>
+  </dependencies>
+
+  <build>
+    <plugins>
+    </plugins>
+  </build>
+
+</project>

hadoop-yarn-project/hadoop-yarn/hadoop-yarn-server/hadoop-yarn-server-router/src/main/java/org/apache/hadoop/yarn/server/router/Router.java

@@ -0,0 +1,38 @@
+/**
+ * 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.hadoop.yarn.server.router;
+
+/**
+ * The router is a stateless YARN component which is the entry point to the
+ * cluster. It can be deployed on multiple nodes behind a Virtual IP (VIP) with
+ * a LoadBalancer.
+ *
+ * The Router exposes the ApplicationClientProtocol (RPC and REST) to the
+ * outside world, transparently hiding the presence of ResourceManager(s), which
+ * allows users to request and update reservations, submit and kill
+ * applications, and request status on running applications.
+ *
+ * In addition, it exposes the ResourceManager Admin API.
+ *
+ * This provides a placeholder for throttling mis-behaving clients (YARN-1546)
+ * and masks the access to multiple RMs (YARN-3659).
+ */
+public class Router{
+
+}

hadoop-yarn-project/hadoop-yarn/hadoop-yarn-server/hadoop-yarn-server-router/src/main/java/org/apache/hadoop/yarn/server/router/package-info.java

@@ -0,0 +1,20 @@
+/*
+ * 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.
+ */
+
+/** Router Server package. **/
+package org.apache.hadoop.yarn.server.router;

hadoop-yarn-project/hadoop-yarn/hadoop-yarn-server/hadoop-yarn-server-router/src/test/java/org/apache/hadoop/yarn/server/router/TestRouter.java

@@ -0,0 +1,26 @@
+/**
+ * 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.hadoop.yarn.server.router;
+
+/**
+ * Test class for YARN Router.
+ */
+public class TestRouter {
+
+}

hadoop-yarn-project/hadoop-yarn/hadoop-yarn-server/pom.xml

@@ -45,5 +45,6 @@
     <module>hadoop-yarn-server-timelineservice</module>
     <module>hadoop-yarn-server-timelineservice-hbase</module>
     <module>hadoop-yarn-server-timelineservice-hbase-tests</module>
+    <module>hadoop-yarn-server-router</module>
   </modules>
 </project>

hadoop-yarn-project/pom.xml

@@ -78,6 +78,10 @@
       <groupId>org.apache.hadoop</groupId>
       <artifactId>hadoop-yarn-server-timelineservice-hbase</artifactId>
     </dependency>
+    <dependency>
+      <groupId>org.apache.hadoop</groupId>
+      <artifactId>hadoop-yarn-server-router</artifactId>
+    </dependency>
   </dependencies>
 
   <build>