org.apache.hadoop.streaming.TestUnconsumedInput.java Source code

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Here is the source code for org.apache.hadoop.streaming.TestUnconsumedInput.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.streaming;

import static org.junit.Assert.*;

import java.io.DataOutputStream;
import java.io.File;
import java.io.FileOutputStream;
import java.io.IOException;

import org.apache.commons.lang.StringUtils;
import org.apache.hadoop.conf.Configuration;
import org.apache.hadoop.fs.FileSystem;
import org.apache.hadoop.fs.FileUtil;
import org.apache.hadoop.fs.Path;
import org.apache.hadoop.hdfs.HdfsConfiguration;
import org.apache.hadoop.hdfs.MiniDFSCluster;
import org.junit.Test;

public class TestUnconsumedInput {
    protected final int EXPECTED_OUTPUT_SIZE = 10000;
    protected File INPUT_FILE = new File("stream_uncinput_input.txt");
    protected File OUTPUT_DIR = new File("stream_uncinput_out");
    // map parses input lines and generates count entries for each word.
    protected String input = "roses.are.red\nviolets.are.blue\nbunnies.are.pink\n";
    protected String map = UtilTest.makeJavaCommand(OutputOnlyApp.class,
            new String[] { Integer.toString(EXPECTED_OUTPUT_SIZE) });

    private StreamJob job;

    public TestUnconsumedInput() throws IOException {
        UtilTest utilTest = new UtilTest(getClass().getName());
        utilTest.checkUserDir();
        utilTest.redirectIfAntJunit();
    }

    protected void createInput() throws IOException {
        DataOutputStream out = new DataOutputStream(new FileOutputStream(INPUT_FILE.getAbsoluteFile()));
        for (int i = 0; i < 10000; ++i) {
            out.write(input.getBytes("UTF-8"));
        }
        out.close();
    }

    protected String[] genArgs() {
        return new String[] { "-input", INPUT_FILE.getAbsolutePath(), "-output", OUTPUT_DIR.getAbsolutePath(),
                "-mapper", map, "-reducer", "org.apache.hadoop.mapred.lib.IdentityReducer", "-numReduceTasks", "0",
                "-jobconf", "mapreduce.task.files.preserve.failedtasks=true", "-jobconf",
                "stream.tmpdir=" + System.getProperty("test.build.data", "/tmp") };
    }

    @Test
    public void testUnconsumedInput() throws Exception {
        String outFileName = "part-00000";
        File outFile = null;
        try {
            try {
                FileUtil.fullyDelete(OUTPUT_DIR.getAbsoluteFile());
            } catch (Exception e) {
            }

            createInput();

            // setup config to ignore unconsumed input
            Configuration conf = new Configuration();
            conf.set("stream.minRecWrittenToEnableSkip_", "0");

            job = new StreamJob();
            job.setConf(conf);
            int exitCode = job.run(genArgs());
            assertEquals("Job failed", 0, exitCode);
            outFile = new File(OUTPUT_DIR, outFileName).getAbsoluteFile();
            String output = StreamUtil.slurp(outFile);
            assertEquals("Output was truncated", EXPECTED_OUTPUT_SIZE, StringUtils.countMatches(output, "\t"));
        } finally {
            INPUT_FILE.delete();
            FileUtil.fullyDelete(OUTPUT_DIR.getAbsoluteFile());
        }
    }
}