/**
* 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 java.io.*;
import java.util.*;
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.mapred.lib.KeyFieldBasedPartitioner;
import org.junit.Test;
import static org.junit.Assert.*;
/**
* This class tests hadoopStreaming in MapReduce local mode.
*/
public class TestStreamDataProtocol
{
// "map" command: grep -E (red|green|blue)
// reduce command: uniq
protected File INPUT_FILE = new File("input_for_data_protocol_test.txt");
protected File OUTPUT_DIR = new File("out_for_data_protocol_test");
protected String input = "roses.smell.good\nroses.look.good\nroses.need.care\nroses.attract.bees\nroses.are.red\nroses.are.not.blue\nbunnies.are.pink\nbunnies.run.fast\nbunnies.have.short.tail\nbunnies.have.long.ears\n";
// map behaves like "/usr/bin/cat";
protected String map = UtilTest.makeJavaCommand(TrApp.class, new String[]{".", "."});
// reduce counts the number of values for each key
protected String reduce = "org.apache.hadoop.streaming.ValueCountReduce";
protected String outputExpect = "bunnies.are\t1\nbunnies.have\t2\nbunnies.run\t1\nroses.are\t2\nroses.attract\t1\nroses.look\t1\nroses.need\t1\nroses.smell\t1\n";
private StreamJob job;
public TestStreamDataProtocol() 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()));
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", reduce,
"-partitioner", KeyFieldBasedPartitioner.class.getCanonicalName(),
"-jobconf", "stream.map.output.field.separator=.",
"-jobconf", "stream.num.map.output.key.fields=2",
"-jobconf", "mapreduce.map.output.key.field.separator=.",
"-jobconf", "num.key.fields.for.partition=1",
"-jobconf", "mapreduce.job.reduces=2",
"-jobconf", "mapreduce.task.files.preserve.failedtasks=true",
"-jobconf", "stream.tmpdir="+System.getProperty("test.build.data","/tmp")
};
}
@Test
public void testCommandLine() throws Exception
{
try {
FileUtil.fullyDelete(OUTPUT_DIR.getAbsoluteFile());
} catch (Exception e) {
}
try {
createInput();
boolean mayExit = false;
// During tests, the default Configuration will use a local mapred
// So don't specify -config or -cluster
job = new StreamJob(genArgs(), mayExit);
job.go();
File outFile = new File(OUTPUT_DIR, "part-00000").getAbsoluteFile();
String output = StreamUtil.slurp(outFile);
outFile.delete();
System.err.println("outEx1=" + outputExpect);
System.err.println(" out1=" + output);
System.err.println(" equals=" + outputExpect.compareTo(output));
assertEquals(outputExpect, output);
} finally {
INPUT_FILE.delete();
FileUtil.fullyDelete(OUTPUT_DIR.getAbsoluteFile());
}
}
public static void main(String[]args) throws Exception
{
new TestStreamDataProtocol().testCommandLine();
}
}