| /** |
| * 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.resourcemanager; |
| |
| import org.apache.hadoop.http.IsActiveServlet; |
| import org.apache.hadoop.ha.HAServiceProtocol; |
| |
| /** |
| * Used by Load Balancers to find the active ResourceManager. |
| */ |
| public class IsResourceManagerActiveServlet extends IsActiveServlet { |
| |
| public static final String RM_ATTRIBUTE = "rm"; |
| |
| @Override |
| protected boolean isActive() { |
| ResourceManager rm = (ResourceManager) |
| getServletContext().getAttribute(RM_ATTRIBUTE); |
| RMContext rmContext = rm.getRMContext(); |
| HAServiceProtocol.HAServiceState state = rmContext.getHAServiceState(); |
| return state == HAServiceProtocol.HAServiceState.ACTIVE; |
| } |
| } |