org.apache.whirr.service.hadoop.HadoopServiceTest.java Source code

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

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/**
 * 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;

import static com.google.common.base.Preconditions.checkNotNull;
import static junit.framework.Assert.assertEquals;
import static junit.framework.Assert.assertNull;

import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStreamReader;
import java.io.OutputStream;
import java.io.OutputStreamWriter;
import java.io.Writer;
import java.util.Map.Entry;

import org.apache.hadoop.conf.Configuration;
import org.apache.hadoop.fs.FSDataInputStream;
import org.apache.hadoop.fs.FileSystem;
import org.apache.hadoop.fs.Path;
import org.apache.hadoop.io.LongWritable;
import org.apache.hadoop.io.Text;
import org.apache.hadoop.mapred.ClusterStatus;
import org.apache.hadoop.mapred.FileInputFormat;
import org.apache.hadoop.mapred.FileOutputFormat;
import org.apache.hadoop.mapred.JobClient;
import org.apache.hadoop.mapred.JobConf;
import org.apache.hadoop.mapred.lib.LongSumReducer;
import org.apache.hadoop.mapred.lib.TokenCountMapper;
import org.apache.whirr.service.ClusterSpec;
import org.apache.whirr.service.ServiceSpec;
import org.apache.whirr.service.ClusterSpec.InstanceTemplate;
import org.junit.After;
import org.junit.Before;
import org.junit.Test;

public class HadoopServiceTest {

    private String clusterName = "hadoopclustertest";

    private HadoopService service;
    private HadoopProxy proxy;
    private HadoopCluster cluster;

    @Before
    public void setUp() throws IOException {
        String secretKeyFile;
        try {
            secretKeyFile = checkNotNull(System.getProperty("whirr.test.ssh.keyfile"));
        } catch (NullPointerException e) {
            secretKeyFile = System.getProperty("user.home") + "/.ssh/id_rsa";
        }
        ServiceSpec serviceSpec = new ServiceSpec();
        serviceSpec.setProvider(checkNotNull(System.getProperty("whirr.test.provider", "ec2")));
        serviceSpec.setAccount(checkNotNull(System.getProperty("whirr.test.user")));
        serviceSpec.setKey(checkNotNull(System.getProperty("whirr.test.key")));
        serviceSpec.setSecretKeyFile(secretKeyFile);
        serviceSpec.setClusterName(clusterName);
        service = new HadoopService(serviceSpec);

        ClusterSpec clusterSpec = new ClusterSpec(new InstanceTemplate(1, HadoopService.MASTER_ROLE),
                new InstanceTemplate(1, HadoopService.WORKER_ROLE));

        cluster = service.launchCluster(clusterSpec);
        proxy = new HadoopProxy(serviceSpec, cluster);
        proxy.start();
    }

    @Test
    public void test() throws Exception {
        Configuration conf = getConfiguration();

        JobConf job = new JobConf(conf, HadoopServiceTest.class);
        JobClient client = new JobClient(job);
        waitForTaskTrackers(client);

        FileSystem fs = FileSystem.get(conf);

        OutputStream os = fs.create(new Path("input"));
        Writer wr = new OutputStreamWriter(os);
        wr.write("b a\n");
        wr.close();

        job.setMapperClass(TokenCountMapper.class);
        job.setReducerClass(LongSumReducer.class);
        job.setOutputKeyClass(Text.class);
        job.setOutputValueClass(LongWritable.class);
        FileInputFormat.setInputPaths(job, new Path("input"));
        FileOutputFormat.setOutputPath(job, new Path("output"));

        JobClient.runJob(job);

        FSDataInputStream in = fs.open(new Path("output/part-00000"));
        BufferedReader reader = new BufferedReader(new InputStreamReader(in));
        assertEquals("a\t1", reader.readLine());
        assertEquals("b\t1", reader.readLine());
        assertNull(reader.readLine());
        reader.close();

    }

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

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

    @After
    public void tearDown() throws IOException {
        proxy.stop();
        service.destroyCluster();
    }

}