org.apache.hadoop.mapred.TestJobClient.java Source code

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Here is the source code for org.apache.hadoop.mapred.TestJobClient.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.hadoop.mapred;

import java.io.BufferedReader;
import java.io.ByteArrayOutputStream;
import java.io.IOException;
import java.io.InputStreamReader;
import java.io.OutputStream;
import java.io.OutputStreamWriter;
import java.io.PipedInputStream;
import java.io.PipedOutputStream;
import java.io.PrintStream;
import java.io.Writer;

import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;
import org.apache.hadoop.conf.Configuration;
import org.apache.hadoop.fs.Path;
import org.apache.hadoop.io.LongWritable;
import org.apache.hadoop.io.Text;
import org.apache.hadoop.util.Tool;
import org.apache.hadoop.util.ToolRunner;

public class TestJobClient extends ClusterMapReduceTestCase {

    private static final Log LOG = LogFactory.getLog(TestJobClient.class);

    private String runJob() throws Exception {
        OutputStream os = getFileSystem().create(new Path(getInputDir(), "text.txt"));
        Writer wr = new OutputStreamWriter(os);
        wr.write("hello1\n");
        wr.write("hello2\n");
        wr.write("hello3\n");
        wr.close();

        JobConf conf = createJobConf();
        conf.setJobName("mr");
        conf.setJobPriority(JobPriority.HIGH);

        conf.setInputFormat(TextInputFormat.class);

        conf.setMapOutputKeyClass(LongWritable.class);
        conf.setMapOutputValueClass(Text.class);

        conf.setOutputFormat(TextOutputFormat.class);
        conf.setOutputKeyClass(LongWritable.class);
        conf.setOutputValueClass(Text.class);

        conf.setMapperClass(org.apache.hadoop.mapred.lib.IdentityMapper.class);
        conf.setReducerClass(org.apache.hadoop.mapred.lib.IdentityReducer.class);

        FileInputFormat.setInputPaths(conf, getInputDir());
        FileOutputFormat.setOutputPath(conf, getOutputDir());

        return JobClient.runJob(conf).getID().toString();
    }

    private int runTool(Configuration conf, Tool tool, String[] args, OutputStream out) throws Exception {
        PrintStream oldOut = System.out;
        PrintStream newOut = new PrintStream(out, true);
        try {
            System.setOut(newOut);
            return ToolRunner.run(conf, tool, args);
        } finally {
            System.setOut(oldOut);
        }
    }

    public void testGetCounter() throws Exception {
        String jobId = runJob();
        ByteArrayOutputStream out = new ByteArrayOutputStream();
        int exitCode = runTool(createJobConf(), new JobClient(),
                new String[] { "-counter", jobId, "org.apache.hadoop.mapred.Task$Counter", "MAP_INPUT_RECORDS" },
                out);
        assertEquals("Exit code", 0, exitCode);
        assertEquals("Counter", "3", out.toString().trim());
    }

    public void testJobList() throws Exception {
        String jobId = runJob();
        verifyJobPriority(jobId, "HIGH");
    }

    private void verifyJobPriority(String jobId, String priority) throws Exception {
        PipedInputStream pis = new PipedInputStream();
        PipedOutputStream pos = new PipedOutputStream(pis);
        int exitCode = runTool(createJobConf(), new JobClient(), new String[] { "-list", "all" }, pos);
        assertEquals("Exit code", 0, exitCode);
        BufferedReader br = new BufferedReader(new InputStreamReader(pis));
        String line = null;
        while ((line = br.readLine()) != null) {
            LOG.info("line = " + line);
            if (!line.startsWith(jobId)) {
                continue;
            }
            assertTrue(line.contains(priority));
            break;
        }
        pis.close();
    }

    public void testChangingJobPriority() throws Exception {
        String jobId = runJob();
        int exitCode = runTool(createJobConf(), new JobClient(),
                new String[] { "-set-priority", jobId, "VERY_LOW" }, new ByteArrayOutputStream());
        assertEquals("Exit code", 0, exitCode);
        verifyJobPriority(jobId, "VERY_LOW");
    }
}