YARN-11012. Add version and process startup time on Router web page

Author: luoyuan

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

@@ -29,6 +29,7 @@
 import org.apache.hadoop.util.JvmPauseMonitor;
 import org.apache.hadoop.util.ShutdownHookManager;
 import org.apache.hadoop.util.StringUtils;
+import org.apache.hadoop.util.Time;
 import org.apache.hadoop.yarn.YarnUncaughtExceptionHandler;
 import org.apache.hadoop.yarn.conf.YarnConfiguration;
 import org.apache.hadoop.yarn.exceptions.YarnRuntimeException;
@@ -83,6 +84,8 @@ public class Router extends CompositeService {
 
   private static final String METRICS_NAME = "Router";
 
+  private static long routerStartupTime = Time.monotonicNow();
+
   public Router() {
     super(Router.class.getName());
   }
@@ -171,6 +174,10 @@ public void startWepApp() {
     webApp = builder.start(new RouterWebApp(this));
   }
 
+  public static long getRouterStartupTime() {
+    return routerStartupTime;
+  }
+
   public static void main(String[] argv) {
     Configuration conf = new YarnConfiguration();
     Thread

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

@@ -31,6 +31,7 @@ public void render(Block html) {
       div("#nav").
         h3("Cluster").
         ul().
+          li().a(url("server"), "ServerInfo").__().
           li().a(url(""), "About").__().
           li().a(url("federation"), "Federation").__().
           li().a(url("nodes"), "Nodes").__().

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

@@ -38,6 +38,11 @@ public void index() {
     render(AboutPage.class);
   }
 
+  public void server() {
+    setTitle("About the current router server");
+    render(ServerPage.class);
+  }
+
   public void about() {
     setTitle("About the Cluster");
     render(AboutPage.class);

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

@@ -45,6 +45,7 @@ public void setup() {
       bind(Router.class).toInstance(router);
     }
     route("/", RouterController.class);
+    route("/server", RouterController.class, "server");
     route("/cluster", RouterController.class, "about");
     route("/about", RouterController.class, "about");
     route("/apps", RouterController.class, "apps");

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

@@ -0,0 +1,51 @@
+/**
+* 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.webapp;
+
+import com.google.inject.Inject;
+import org.apache.hadoop.util.VersionInfo;
+import org.apache.hadoop.yarn.server.router.Router;
+import org.apache.hadoop.yarn.util.YarnVersionInfo;
+import org.apache.hadoop.yarn.webapp.view.HtmlBlock;
+import org.apache.hadoop.yarn.webapp.view.InfoBlock;
+
+import java.util.Date;
+
+/**
+ * Server block for the Router Web UI.
+ */
+public class ServerBlock extends HtmlBlock {
+
+  @Inject
+  ServerBlock(Router router, ViewContext ctx) {
+    super(ctx);
+  }
+
+  @Override
+  protected void render(Block html) {
+
+    info("Router Details")
+        .__("Router started on",
+            new Date(Router.getRouterStartupTime()))
+        .__("Router Version", YarnVersionInfo.getVersion())
+        .__("Hadoop Version", VersionInfo.getVersion());
+
+    html.__(InfoBlock.class);
+  }
+}

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

@@ -0,0 +1,37 @@
+/**
+* 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.webapp;
+
+import org.apache.hadoop.yarn.webapp.SubView;
+
+/**
+ * Server page for the Router Web UI.
+ */
+public class ServerPage extends RouterView {
+
+  @Override
+  protected void preHead(Page.HTML<__> html) {
+    commonPreHead(html);
+  }
+
+  @Override
+  protected Class<? extends SubView> content() {
+    return ServerBlock.class;
+  }
+}