Java tutorial
package org.hortonworks.dovetail.am; /** * 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. */ import java.io.BufferedReader; import java.io.File; import java.io.IOException; import java.io.InputStreamReader; import java.net.URI; import java.nio.ByteBuffer; import java.util.ArrayList; import java.util.HashMap; import java.util.List; import java.util.Map; import java.util.concurrent.ConcurrentHashMap; import java.util.concurrent.ConcurrentMap; import java.util.concurrent.atomic.AtomicInteger; import java.util.logging.Level; import java.util.logging.Logger; import org.apache.hadoop.fs.FileStatus; import org.apache.hadoop.fs.FileSystem; import org.apache.hadoop.fs.Path; import org.apache.hadoop.yarn.api.ApplicationConstants; import org.apache.hadoop.yarn.api.ApplicationConstants.Environment; import org.apache.hadoop.yarn.api.ContainerManagementProtocol; import org.apache.hadoop.yarn.api.protocolrecords.RegisterApplicationMasterResponse; import org.apache.hadoop.yarn.api.records.ApplicationAttemptId; import org.apache.hadoop.yarn.api.records.Container; import org.apache.hadoop.yarn.api.records.ContainerExitStatus; import org.apache.hadoop.yarn.api.records.ContainerId; import org.apache.hadoop.yarn.api.records.ContainerLaunchContext; import org.apache.hadoop.yarn.api.records.ContainerState; import org.apache.hadoop.yarn.api.records.ContainerStatus; import org.apache.hadoop.yarn.api.records.FinalApplicationStatus; import org.apache.hadoop.yarn.api.records.LocalResource; import org.apache.hadoop.yarn.api.records.LocalResourceType; import org.apache.hadoop.yarn.api.records.LocalResourceVisibility; import org.apache.hadoop.yarn.api.records.NodeReport; import org.apache.hadoop.yarn.api.records.Priority; import org.apache.hadoop.yarn.api.records.Resource; import org.apache.hadoop.yarn.client.api.AMRMClient.ContainerRequest; import org.apache.hadoop.yarn.client.api.async.AMRMClientAsync; import org.apache.hadoop.yarn.client.api.async.NMClientAsync; import org.apache.hadoop.yarn.client.api.async.impl.NMClientAsyncImpl; import org.apache.hadoop.yarn.exceptions.YarnException; import org.apache.hadoop.yarn.server.nodemanager.containermanager.localizer.ContainerLocalizer; import org.apache.hadoop.yarn.util.ConverterUtils; import org.apache.hadoop.yarn.util.Records; import org.hortonworks.dovetail.util.DovetailConfiguration; /** * JBoss AS 7.1 Application Master. Spin up domain mode (i.e. clustered) * services via YARN. */ public class AppMaster { private static final Logger LOG = Logger.getLogger(AppMaster.class.getName()); private DovetailConfiguration conf; @SuppressWarnings("rawtypes") private AMRMClientAsync resourceManager; private NMClientAsync nmClientAsync; private NMCallbackHandler containerListener; private ApplicationAttemptId appAttemptID; private String appMasterHostname = ""; private int appMasterRpcPort = 0; private String appMasterTrackingUrl = ""; private int numContainers; private int containerMemory; private int containerPriority; private AtomicInteger numCompletedContainers = new AtomicInteger(); private AtomicInteger numAllocatedContainers = new AtomicInteger(); private AtomicInteger numFailedContainers = new AtomicInteger(); private AtomicInteger numRequestedContainers = new AtomicInteger(); private Map<String, String> shellEnv = new HashMap<String, String>(); private String amJar; private String domainController; private volatile boolean done; private volatile boolean success; private List<Thread> launchThreads = new ArrayList<Thread>(); /** * @param args * Command line args */ public static void main(String[] args) { boolean result = false; try { AppMaster appMaster = new AppMaster(); LOG.info("Initializing Dovetail Application Master"); boolean doRun = appMaster.init(args); if (!doRun) { System.exit(0); } result = appMaster.run(); } catch (Throwable t) { LOG.log(Level.SEVERE, "Error running ApplicationMaster", t); System.exit(1); } if (result) { LOG.info("Application Master completed successfully. exiting"); System.exit(0); } else { LOG.info("Application Master failed. exiting"); System.exit(2); } } /** * Dump out contents of $CWD and the environment to stdout for debugging */ private void dumpOutDebugInfo() { LOG.info("Dump debug output"); Map<String, String> envs = System.getenv(); for (Map.Entry<String, String> env : envs.entrySet()) { LOG.info("System env: key=" + env.getKey() + ", val=" + env.getValue()); System.out.println("System env: key=" + env.getKey() + ", val=" + env.getValue()); } String cmd = "ls -al"; Runtime run = Runtime.getRuntime(); Process pr = null; try { pr = run.exec(cmd); pr.waitFor(); BufferedReader buf = new BufferedReader(new InputStreamReader(pr.getInputStream())); String line = ""; while ((line = buf.readLine()) != null) { LOG.info("System CWD content: " + line); System.out.println("System CWD content: " + line); } buf.close(); } catch (IOException e) { e.printStackTrace(); } catch (InterruptedException e) { e.printStackTrace(); } } public AppMaster() throws Exception { conf = new DovetailConfiguration(); } /** * Parse command line options * * @param args * Command line args * @return Whether init successful and run should be invoked * @throws IOException */ public boolean init(String[] args) throws IOException { Map<String, String> envs = System.getenv(); ContainerId containerId = ConverterUtils.toContainerId(envs.get(Environment.CONTAINER_ID.name())); containerId = ConverterUtils.toContainerId(envs.get(Environment.CONTAINER_ID.name())); appAttemptID = containerId.getApplicationAttemptId(); if (!envs.containsKey(ApplicationConstants.APP_SUBMIT_TIME_ENV)) { throw new RuntimeException(ApplicationConstants.APP_SUBMIT_TIME_ENV + " not set in the environment"); } if (!envs.containsKey(Environment.NM_HOST.name())) { throw new RuntimeException(Environment.NM_HOST.name() + " not set in the environment"); } if (!envs.containsKey(Environment.NM_HTTP_PORT.name())) { throw new RuntimeException(Environment.NM_HTTP_PORT + " not set in the environment"); } if (!envs.containsKey(Environment.NM_PORT.name())) { throw new RuntimeException(Environment.NM_PORT.name() + " not set in the environment"); } LOG.info("Application master for app" + ", appId=" + appAttemptID.getApplicationId().getId() + ", clustertimestamp=" + appAttemptID.getApplicationId().getClusterTimestamp() + ", attemptId=" + appAttemptID.getAttemptId()); numContainers = conf.getInt(DovetailConfiguration.DOVETAIL_CONTAINER_COUNT, DovetailConfiguration.DEFAULT_CONTAINER_COUNT); containerMemory = conf.getInt(DovetailConfiguration.DOVETAIL_CONTAINER_MEMORY, DovetailConfiguration.DEFAULT_CONTAINER_MEMORY); containerMemory = conf.getInt(DovetailConfiguration.DOVETAIL_CONTAINER_PRIORITY, DovetailConfiguration.DEFAULT_DOVETAIL_CONTAINER_PRIORITY); amJar = conf.get(DovetailConfiguration.DOVETAIL_AM_HDFS_DIR) + Path.SEPARATOR + System.getProperty(DovetailConfiguration.DOVETAIL_AM_JAR); return true; } /** * Main run function for the application master * * @throws YarnException * @throws IOException */ @SuppressWarnings({ "unchecked" }) public boolean run() throws YarnException, IOException { LOG.info("Starting ApplicationMaster"); AMRMClientAsync.CallbackHandler allocListener = new RMCallbackHandler(); resourceManager = AMRMClientAsync.createAMRMClientAsync(1000, allocListener); resourceManager.init(conf); resourceManager.start(); containerListener = new NMCallbackHandler(); nmClientAsync = new NMClientAsyncImpl(containerListener); nmClientAsync.init(conf); nmClientAsync.start(); RegisterApplicationMasterResponse response = resourceManager.registerApplicationMaster(appMasterHostname, appMasterRpcPort, appMasterTrackingUrl); int maxMem = response.getMaximumResourceCapability().getMemory(); LOG.info("Max mem capabililty of resources in this cluster " + maxMem); // A resource ask cannot exceed the max. if (containerMemory > maxMem) { LOG.info("Container memory specified above max threshold of cluster." + " Using max value." + ", specified=" + containerMemory + ", max=" + maxMem); containerMemory = maxMem; } for (int i = 0; i < numContainers; ++i) { ContainerRequest containerAsk = setupContainerAskForRM(); resourceManager.addContainerRequest(containerAsk); } numRequestedContainers.set(numContainers); while (!done) { try { Thread.sleep(200); } catch (InterruptedException ex) { } } finish(); return success; } private void finish() { for (Thread launchThread : launchThreads) { try { launchThread.join(10000); } catch (InterruptedException e) { LOG.info("Exception thrown in thread join: " + e.getMessage()); e.printStackTrace(); } } LOG.info("Application completed. Stopping running containers"); nmClientAsync.stop(); LOG.info("Application completed. Signalling finish to RM"); FinalApplicationStatus appStatus; String appMessage = null; success = true; if (numFailedContainers.get() == 0 && numCompletedContainers.get() == numContainers) { appStatus = FinalApplicationStatus.SUCCEEDED; } else { appStatus = FinalApplicationStatus.FAILED; appMessage = "Diagnostics." + ", total=" + numContainers + ", completed=" + numCompletedContainers.get() + ", allocated=" + numAllocatedContainers.get() + ", failed=" + numFailedContainers.get(); success = false; } try { resourceManager.unregisterApplicationMaster(appStatus, appMessage, null); } catch (YarnException ex) { LOG.log(Level.SEVERE, "Failed to unregister application", ex); } catch (IOException e) { LOG.log(Level.SEVERE, "Failed to unregister application", e); } done = true; resourceManager.stop(); } private class RMCallbackHandler implements AMRMClientAsync.CallbackHandler { @SuppressWarnings("unchecked") public void onContainersCompleted(List<ContainerStatus> completedContainers) { LOG.info("Got response from RM for container ask, completedCnt=" + completedContainers.size()); for (ContainerStatus containerStatus : completedContainers) { LOG.info("Got container status for containerID=" + containerStatus.getContainerId() + ", state=" + containerStatus.getState() + ", exitStatus=" + containerStatus.getExitStatus() + ", diagnostics=" + containerStatus.getDiagnostics()); assert (containerStatus.getState() == ContainerState.COMPLETE); int exitStatus = containerStatus.getExitStatus(); if (0 != exitStatus) { if (ContainerExitStatus.ABORTED != exitStatus) { numCompletedContainers.incrementAndGet(); numFailedContainers.incrementAndGet(); } else { numAllocatedContainers.decrementAndGet(); numRequestedContainers.decrementAndGet(); } } else { numCompletedContainers.incrementAndGet(); LOG.info("Container completed successfully." + ", containerId=" + containerStatus.getContainerId()); } } int askCount = numContainers - numRequestedContainers.get(); numRequestedContainers.addAndGet(askCount); if (askCount > 0) { for (int i = 0; i < askCount; ++i) { ContainerRequest containerAsk = setupContainerAskForRM(); resourceManager.addContainerRequest(containerAsk); } } if (numCompletedContainers.get() == numContainers) { done = true; } } public void onContainersAllocated(List<Container> allocatedContainers) { LOG.info("Got response from RM for container ask, allocatedCnt=" + allocatedContainers.size()); numAllocatedContainers.addAndGet(allocatedContainers.size()); for (Container allocatedContainer : allocatedContainers) { LOG.info("Launching shell command on a new container." + ", containerId=" + allocatedContainer.getId() + ", containerNode=" + allocatedContainer.getNodeId().getHost() + ":" + allocatedContainer.getNodeId().getPort() + ", containerNodeURI=" + allocatedContainer.getNodeHttpAddress() + ", containerResourceMemory" + allocatedContainer.getResource().getMemory()); LaunchContainerRunnable runnableLaunchContainer = new LaunchContainerRunnable(allocatedContainer, containerListener); Thread launchThread = new Thread(runnableLaunchContainer); launchThreads.add(launchThread); launchThread.start(); } } public void onShutdownRequest() { done = true; } public void onNodesUpdated(List<NodeReport> updatedNodes) { } public float getProgress() { float progress = (float) numCompletedContainers.get() / numContainers; return progress; } public void onError(Throwable e) { done = true; resourceManager.stop(); } } private class NMCallbackHandler implements NMClientAsync.CallbackHandler { private ConcurrentMap<ContainerId, Container> containers = new ConcurrentHashMap<ContainerId, Container>(); public void addContainer(ContainerId containerId, Container container) { containers.putIfAbsent(containerId, container); LOG.info("Callback container id : " + containerId.toString()); if (containers.size() == 1) { domainController = container.getNodeId().getHost(); } } public void onContainerStopped(ContainerId containerId) { if (LOG.isLoggable(Level.FINEST)) { LOG.finest("Succeeded to stop Container " + containerId); } containers.remove(containerId); } public void onContainerStatusReceived(ContainerId containerId, ContainerStatus containerStatus) { if (LOG.isLoggable(Level.FINEST)) { LOG.finest("Container Status: id=" + containerId + ", status=" + containerStatus); } } public void onContainerStarted(ContainerId containerId, Map<String, ByteBuffer> allServiceResponse) { if (LOG.isLoggable(Level.FINEST)) { LOG.finest("Succeeded to start Container " + containerId); } Container container = containers.get(containerId); if (container != null) { nmClientAsync.getContainerStatusAsync(containerId, container.getNodeId()); } } public void onStartContainerError(ContainerId containerId, Throwable t) { LOG.log(Level.SEVERE, "Failed to start Container " + containerId, t); containers.remove(containerId); } public void onGetContainerStatusError(ContainerId containerId, Throwable t) { LOG.log(Level.SEVERE, "Failed to query the status of Container " + containerId, t); } public void onStopContainerError(ContainerId containerId, Throwable t) { LOG.log(Level.SEVERE, "Failed to stop Container " + containerId, t); containers.remove(containerId); } public int getContainerCount() { return containers.size(); } } /** * Thread to connect to the {@link ContainerManagementProtocol} and launch * the container that will execute the shell command. */ private class LaunchContainerRunnable implements Runnable { Container container; NMCallbackHandler containerListener; /** * @param lcontainer * Allocated container * @param containerListener * Callback handler of the container */ public LaunchContainerRunnable(Container lcontainer, NMCallbackHandler containerListener) { this.container = lcontainer; this.containerListener = containerListener; } /** * Connects to CM, sets up container launch context for shell command * and eventually dispatches the container start request to the CM. */ public void run() { String containerId = container.getId().toString(); LOG.info("Setting up container launch container for containerid=" + container.getId()); ContainerLaunchContext ctx = Records.newRecord(ContainerLaunchContext.class); ctx.setEnvironment(shellEnv); Map<String, LocalResource> localResources = new HashMap<String, LocalResource>(); String applicationId = container.getId().getApplicationAttemptId().getApplicationId().toString(); try { FileSystem fs = FileSystem.get(conf); String host = container.getNodeId().getHost(); LocalResource jbossDistResource = Records.newRecord(LocalResource.class); jbossDistResource.setType(LocalResourceType.ARCHIVE); jbossDistResource.setVisibility(LocalResourceVisibility.APPLICATION); String jbossDistUri = conf.get(DovetailConfiguration.JBOSS_DIST_HDFS_DIR) + Path.SEPARATOR + System.getProperty(DovetailConfiguration.JBOSS_DIST_FILE); LOG.info(String.format("Setting %s as local resource on %s", jbossDistUri, host)); Path jbossDistPath = new Path(new URI(jbossDistUri)); jbossDistResource.setResource(ConverterUtils.getYarnUrlFromPath(jbossDistPath)); jbossDistResource.setTimestamp(fs.getFileStatus(jbossDistPath).getModificationTime()); jbossDistResource.setSize(fs.getFileStatus(jbossDistPath).getLen()); localResources.put(conf.get(DovetailConfiguration.DOVETAIL_SYMLINK), jbossDistResource); LocalResource jbossConfResource = Records.newRecord(LocalResource.class); jbossConfResource.setType(LocalResourceType.FILE); jbossConfResource.setVisibility(LocalResourceVisibility.APPLICATION); LOG.info(String.format("Setting %s as local resource on %s", amJar, host)); Path jbossConfPath = new Path(new URI(amJar)); jbossConfResource.setResource(ConverterUtils.getYarnUrlFromPath(jbossConfPath)); jbossConfResource.setTimestamp(fs.getFileStatus(jbossConfPath).getModificationTime()); jbossConfResource.setSize(fs.getFileStatus(jbossConfPath).getLen()); localResources.put(conf.get(DovetailConfiguration.DOVETAIL_AM_JAR), jbossConfResource); String containerScriptUri = conf.get(DovetailConfiguration.DOVETAIL_BIN_HDFS_DIR) + Path.SEPARATOR + conf.get(DovetailConfiguration.DOVETAIL_CONTAINER_SCRIPT); LOG.info(String.format("Setting %s as local resource on %s", containerScriptUri, host)); Path containerScriptPath = new Path(new URI(containerScriptUri)); FileStatus containerScriptStatus = fs.getFileStatus(containerScriptPath); LocalResource containerScriptResource = Records.newRecord(LocalResource.class); containerScriptResource.setType(LocalResourceType.FILE); containerScriptResource.setVisibility(LocalResourceVisibility.APPLICATION); containerScriptResource.setResource(ConverterUtils.getYarnUrlFromPath(containerScriptPath)); containerScriptResource.setTimestamp(containerScriptStatus.getModificationTime()); containerScriptResource.setSize(containerScriptStatus.getLen()); localResources.put(conf.get(DovetailConfiguration.DOVETAIL_CONTAINER_SCRIPT), containerScriptResource); ctx.setLocalResources(localResources); List<String> commands = new ArrayList<String>(); String containerHome = conf.get(DovetailConfiguration.NM_LOCAL_DIRS) + File.separator + ContainerLocalizer.USERCACHE + File.separator + System.getenv().get(Environment.USER.toString()) + File.separator + ContainerLocalizer.APPCACHE + File.separator + applicationId + File.separator + containerId; String jbossHomeParent = containerHome + File.separator + conf.get(DovetailConfiguration.DOVETAIL_SYMLINK); int portOffset = 0; int containerCount = containerListener.getContainerCount(); if (containerCount > 1) { portOffset = containerCount * 150; } Map<String, String> env = new HashMap<String, String>(); env.put("JBOSS_HOME_PARENT_LINK", jbossHomeParent); env.put("JBOSS_DOMAIN_CONTROLLER", domainController == null ? host : domainController); env.put("JBOSS_HOST", host); env.put("JBOSS_PORT_OFFSET", String.valueOf(portOffset)); env.put("DOVETAIL_APP_ID", applicationId); env.put("DOVETAIL_ADMIN_USER", conf.get(DovetailConfiguration.DOVETAIL_ADMIN_USER)); env.put("DOVETAIL_APP", containerHome + File.separatorChar + conf.get(DovetailConfiguration.DOVETAIL_AM_JAR)); env.put("JAVA_OPTS", conf.get(DovetailConfiguration.DOVETAIL_CONTAINER_JAVA_OPTS)); ctx.setEnvironment(env); commands.add( containerHome + File.separator + conf.get(DovetailConfiguration.DOVETAIL_CONTAINER_SCRIPT)); ctx.setCommands(commands); containerListener.addContainer(container.getId(), container); nmClientAsync.startContainerAsync(container, ctx); } catch (Exception e) { LOG.log(Level.SEVERE, "Problem setting local resources", e); numCompletedContainers.incrementAndGet(); numFailedContainers.incrementAndGet(); return; } } } /** * Setup the request that will be sent to the RM for the container ask. * * @param numContainers * Containers to ask for from RM * @return the setup ResourceRequest to be sent to RM */ private ContainerRequest setupContainerAskForRM() { Priority pri = Records.newRecord(Priority.class); pri.setPriority(containerPriority); Resource capability = Records.newRecord(Resource.class); capability.setMemory(containerMemory); capability.setVirtualCores(2); ContainerRequest request = new ContainerRequest(capability, null, null, pri); LOG.info("Requested container ask: " + request.toString()); return request; } }