| /** |
| * 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.sharedcachemanager; |
| |
| import java.io.IOException; |
| import java.util.ArrayList; |
| import java.util.Collection; |
| import java.util.EnumSet; |
| import java.util.List; |
| |
| import org.apache.hadoop.classification.InterfaceAudience.Private; |
| import org.apache.hadoop.classification.InterfaceStability.Unstable; |
| import org.apache.hadoop.conf.Configuration; |
| import org.apache.hadoop.yarn.api.records.ApplicationId; |
| import org.apache.hadoop.yarn.api.records.ApplicationReport; |
| import org.apache.hadoop.yarn.api.records.YarnApplicationState; |
| import org.apache.hadoop.yarn.client.api.YarnClient; |
| import org.apache.hadoop.yarn.exceptions.ApplicationNotFoundException; |
| import org.apache.hadoop.yarn.exceptions.YarnException; |
| |
| /** |
| * An implementation of AppChecker that queries the resource manager remotely to |
| * determine whether the app is running. |
| */ |
| @Private |
| @Unstable |
| public class RemoteAppChecker extends AppChecker { |
| |
| private static final EnumSet<YarnApplicationState> ACTIVE_STATES = EnumSet |
| .of(YarnApplicationState.NEW, YarnApplicationState.ACCEPTED, |
| YarnApplicationState.NEW_SAVING, YarnApplicationState.SUBMITTED, |
| YarnApplicationState.RUNNING); |
| |
| private final YarnClient client; |
| |
| public RemoteAppChecker() { |
| this(YarnClient.createYarnClient()); |
| } |
| |
| RemoteAppChecker(YarnClient client) { |
| super("RemoteAppChecker"); |
| this.client = client; |
| } |
| |
| @Override |
| protected void serviceInit(Configuration conf) throws Exception { |
| addService(client); |
| super.serviceInit(conf); |
| } |
| |
| @Override |
| @Private |
| public boolean isApplicationActive(ApplicationId id) throws YarnException { |
| ApplicationReport report = null; |
| try { |
| report = client.getApplicationReport(id); |
| } catch (ApplicationNotFoundException e) { |
| // the app does not exist |
| return false; |
| } catch (IOException e) { |
| throw new YarnException(e); |
| } |
| |
| if (report == null) { |
| // the app does not exist |
| return false; |
| } |
| |
| return ACTIVE_STATES.contains(report.getYarnApplicationState()); |
| } |
| |
| @Override |
| @Private |
| public Collection<ApplicationId> getActiveApplications() throws YarnException { |
| try { |
| List<ApplicationId> activeApps = new ArrayList<ApplicationId>(); |
| List<ApplicationReport> apps = client.getApplications(ACTIVE_STATES); |
| for (ApplicationReport app: apps) { |
| activeApps.add(app.getApplicationId()); |
| } |
| return activeApps; |
| } catch (IOException e) { |
| throw new YarnException(e); |
| } |
| } |
| } |