Java tutorial
/** * Copyright (C) 2015 DataTorrent, Inc. * * 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. */ package com.datatorrent.stram; import java.io.IOException; import java.util.EnumSet; import java.util.Set; import org.apache.commons.logging.Log; import org.apache.commons.logging.LogFactory; import org.apache.hadoop.conf.Configuration; import org.apache.hadoop.yarn.api.records.ApplicationAttemptId; import org.apache.hadoop.yarn.api.records.ApplicationId; import org.apache.hadoop.yarn.api.records.ApplicationReport; import org.apache.hadoop.yarn.api.records.ApplicationSubmissionContext; import org.apache.hadoop.yarn.api.records.ContainerLaunchContext; import org.apache.hadoop.yarn.api.records.FinalApplicationStatus; import org.apache.hadoop.yarn.api.records.Priority; import org.apache.hadoop.yarn.api.records.YarnApplicationState; import org.apache.hadoop.yarn.client.api.YarnClientApplication; import org.apache.hadoop.yarn.client.api.impl.YarnClientImpl; import org.apache.hadoop.yarn.conf.YarnConfiguration; import org.apache.hadoop.yarn.exceptions.YarnException; import org.apache.hadoop.yarn.util.Records; /** * Base class for a simple client that runs the AM logic inline. The AM is not * launched and managed by the RM. The client creates a new application on the * RM and negotiates a new attempt id. Then it waits for the RM app state to * reach be YarnApplicationState.ACCEPTED after which it runs the AM logic. */ public abstract class InlineAM { private static final Log LOG = LogFactory.getLog(InlineAM.class); // Handle to talk to the Resource Manager/Applications Manager private final YarnClientImpl rmClient; // Application master specific info to register a new Application with RM/ASM private String appName = ""; // App master priority private int amPriority = 0; // Queue for App master private String amQueue = ""; /** */ public InlineAM(Configuration conf) throws Exception { appName = "UnmanagedAM"; amPriority = 0; amQueue = "default"; YarnConfiguration yarnConf = new YarnConfiguration(conf); rmClient = new YarnClientImpl(); rmClient.init(yarnConf); } public abstract void runAM(ApplicationAttemptId attemptId) throws Exception; public boolean run() throws Exception { LOG.info("Starting Client"); // Connect to ResourceManager rmClient.start(); try { // Get a new application id YarnClientApplication newApp = rmClient.createApplication(); ApplicationId appId = newApp.getNewApplicationResponse().getApplicationId(); // Create launch context for app master LOG.info("Setting up application submission context for ASM"); ApplicationSubmissionContext appContext = Records.newRecord(ApplicationSubmissionContext.class); // set the application id appContext.setApplicationId(appId); // set the application name appContext.setApplicationName(appName); // Set the priority for the application master Priority pri = Records.newRecord(Priority.class); pri.setPriority(amPriority); appContext.setPriority(pri); // Set the queue to which this application is to be submitted in the RM appContext.setQueue(amQueue); // Set up the container launch context for the application master ContainerLaunchContext amContainer = Records.newRecord(ContainerLaunchContext.class); appContext.setAMContainerSpec(amContainer); // unmanaged AM appContext.setUnmanagedAM(true); LOG.info("Setting unmanaged AM"); // Submit the application to the applications manager LOG.info("Submitting application to ASM"); rmClient.submitApplication(appContext); // Monitor the application to wait for launch state ApplicationReport appReport = monitorApplication(appId, EnumSet.of(YarnApplicationState.ACCEPTED)); ApplicationAttemptId attemptId = appReport.getCurrentApplicationAttemptId(); LOG.info("Launching application with id: " + attemptId); // launch AM runAM(attemptId); // Monitor the application for end state appReport = monitorApplication(appId, EnumSet.of(YarnApplicationState.KILLED, YarnApplicationState.FAILED, YarnApplicationState.FINISHED)); YarnApplicationState appState = appReport.getYarnApplicationState(); FinalApplicationStatus appStatus = appReport.getFinalApplicationStatus(); LOG.info("App ended with state: " + appReport.getYarnApplicationState() + " and status: " + appStatus); boolean success; if (YarnApplicationState.FINISHED == appState && FinalApplicationStatus.SUCCEEDED == appStatus) { LOG.info("Application has completed successfully."); success = true; } else { LOG.info("Application did finished unsuccessfully." + " YarnState=" + appState.toString() + ", FinalStatus=" + appStatus.toString()); success = false; } return success; } finally { rmClient.stop(); } } /** * Monitor the submitted application for completion. Kill application if time * expires. * * @param appId * Application Id of application to be monitored * @return true if application completed successfully * @throws YarnRemoteException */ private ApplicationReport monitorApplication(ApplicationId appId, Set<YarnApplicationState> finalState) throws YarnException, IOException { while (true) { // Check app status every 1 second. try { Thread.sleep(1000); } catch (InterruptedException e) { LOG.debug("Thread sleep in monitoring loop interrupted"); } // Get application report for the appId we are interested in ApplicationReport report = rmClient.getApplicationReport(appId); LOG.info("Got application report from ASM for" + ", appId=" + appId.getId() + ", appAttemptId=" + report.getCurrentApplicationAttemptId() + ", clientToken=" + report.getClientToAMToken() + ", appDiagnostics=" + report.getDiagnostics() + ", appMasterHost=" + report.getHost() + ", appQueue=" + report.getQueue() + ", appMasterRpcPort=" + report.getRpcPort() + ", appStartTime=" + report.getStartTime() + ", yarnAppState=" + report.getYarnApplicationState().toString() + ", distributedFinalState=" + report.getFinalApplicationStatus().toString() + ", appTrackingUrl=" + report.getTrackingUrl() + ", appUser=" + report.getUser()); YarnApplicationState state = report.getYarnApplicationState(); if (finalState.contains(state)) { return report; } } } }