org.apache.whirr.service.hadoop.integration.HadoopServiceController.java Source code

Introduction

Here is the source code for org.apache.whirr.service.hadoop.integration.HadoopServiceController.java

Source

/**
 * 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.whirr.service.hadoop.integration;

import java.io.IOException;
import java.util.HashMap;
import java.util.Map;
import java.util.Map.Entry;

import org.apache.commons.configuration.CompositeConfiguration;
import org.apache.commons.configuration.ConfigurationException;
import org.apache.commons.configuration.PropertiesConfiguration;
import org.apache.hadoop.conf.Configuration;
import org.apache.hadoop.fs.FileSystem;
import org.apache.hadoop.hdfs.DistributedFileSystem;
import org.apache.hadoop.hdfs.protocol.FSConstants;
import org.apache.hadoop.mapred.ClusterStatus;
import org.apache.hadoop.mapred.JobClient;
import org.apache.hadoop.mapred.JobConf;
import org.apache.whirr.Cluster;
import org.apache.whirr.ClusterController;
import org.apache.whirr.ClusterSpec;
import org.apache.whirr.service.hadoop.HadoopProxy;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

public class HadoopServiceController {

    private static final Logger LOG = LoggerFactory.getLogger(HadoopServiceController.class);

    private static final Map<String, HadoopServiceController> INSTANCES = new HashMap<String, HadoopServiceController>();

    public static HadoopServiceController getInstance(String config) throws ConfigurationException {
        if (!INSTANCES.containsKey(config)) {
            PropertiesConfiguration configuration = new PropertiesConfiguration(config);
            INSTANCES.put(config, new HadoopServiceController(configuration));
        }
        return INSTANCES.get(config);
    }

    private org.apache.commons.configuration.Configuration configuration;

    private boolean running;
    private ClusterSpec clusterSpec;
    private ClusterController controller;
    private HadoopProxy proxy;
    private Cluster cluster;

    private HadoopServiceController(org.apache.commons.configuration.Configuration configuration) {
        this.configuration = configuration;
    }

    public synchronized boolean ensureClusterRunning() throws Exception {
        if (running) {
            LOG.info("Cluster already running.");
            return false;
        } else {
            startup();
            return true;
        }
    }

    public synchronized void startup() throws Exception {
        LOG.info("Starting up cluster...");
        CompositeConfiguration config = new CompositeConfiguration();
        if (System.getProperty("config") != null) {
            config.addConfiguration(new PropertiesConfiguration(System.getProperty("config")));
        }
        config.addConfiguration(configuration);
        clusterSpec = ClusterSpec.withTemporaryKeys(config);
        controller = new ClusterController();

        cluster = controller.launchCluster(clusterSpec);
        proxy = new HadoopProxy(clusterSpec, cluster);
        proxy.start();

        Configuration conf = getConfiguration();
        JobConf job = new JobConf(conf, HadoopServiceTest.class);
        JobClient client = new JobClient(job);
        waitToExitSafeMode(client);
        waitForTaskTrackers(client);
        running = true;
    }

    public Cluster getCluster() {
        return cluster;
    }

    public Configuration getConfiguration() {
        Configuration conf = new Configuration();
        for (Entry<Object, Object> entry : cluster.getConfiguration().entrySet()) {
            conf.set(entry.getKey().toString(), entry.getValue().toString());
        }
        return conf;
    }

    public JobConf getJobConf() {
        return new JobConf(getConfiguration());
    }

    private static void waitToExitSafeMode(JobClient client) throws IOException {
        LOG.info("Waiting to exit safe mode...");
        FileSystem fs = client.getFs();
        DistributedFileSystem dfs = (DistributedFileSystem) fs;
        boolean inSafeMode = true;
        while (inSafeMode) {
            inSafeMode = dfs.setSafeMode(FSConstants.SafeModeAction.SAFEMODE_GET);
            try {
                System.out.print(".");
                Thread.sleep(1000);
            } catch (InterruptedException e) {
                break;
            }
        }
        LOG.info("Exited safe mode");
    }

    private static void waitForTaskTrackers(JobClient client) throws IOException {
        LOG.info("Waiting for tasktrackers...");
        while (true) {
            ClusterStatus clusterStatus = client.getClusterStatus();
            int taskTrackerCount = clusterStatus.getTaskTrackers();
            if (taskTrackerCount > 0) {
                LOG.info("{} tasktrackers reported in. Continuing.", taskTrackerCount);
                break;
            }
            try {
                System.out.print(".");
                Thread.sleep(1000);
            } catch (InterruptedException e) {
                break;
            }
        }
    }

    public synchronized void shutdown() throws IOException, InterruptedException {
        LOG.info("Shutting down cluster...");
        if (proxy != null) {
            proxy.stop();
        }
        controller.destroyCluster(clusterSpec);
        running = false;
    }

}