| /** |
| * 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.ArrayList; |
| import java.util.Arrays; |
| import java.util.HashSet; |
| import java.util.Set; |
| |
| import org.apache.hadoop.util.JarFinder; |
| import org.junit.After; |
| import org.junit.Before; |
| import org.junit.Test; |
| import static org.junit.Assert.*; |
| |
| import org.apache.hadoop.fs.FileSystem; |
| import org.apache.hadoop.fs.Path; |
| import org.apache.hadoop.conf.Configuration; |
| import org.apache.hadoop.util.Shell; |
| |
| /** |
| * This class tests hadoopStreaming in MapReduce local mode. |
| */ |
| public class TestStreaming |
| { |
| |
| public static final String STREAMING_JAR = JarFinder.getJar(StreamJob.class); |
| |
| /** |
| * cat command used for copying stdin to stdout as mapper or reducer function. |
| * On Windows, use a cmd script that approximates the functionality of cat. |
| */ |
| static final String CAT = Shell.WINDOWS ? |
| "cmd /c " + new File("target/bin/cat.cmd").getAbsolutePath() : "cat"; |
| |
| /** |
| * Command used for iterating through file names on stdin and copying each |
| * file's contents to stdout, used as mapper or reducer function. On Windows, |
| * use a cmd script that approximates the functionality of xargs cat. |
| */ |
| static final String XARGS_CAT = Shell.WINDOWS ? |
| "cmd /c " + new File("target/bin/xargs_cat.cmd").getAbsolutePath() : |
| "xargs cat"; |
| |
| // "map" command: grep -E (red|green|blue) |
| // reduce command: uniq |
| protected File TEST_DIR; |
| protected File INPUT_FILE; |
| protected File OUTPUT_DIR; |
| protected String inputFile; |
| protected String outDir; |
| protected String input = "roses.are.red\nviolets.are.blue\nbunnies.are.pink\n"; |
| // map behaves like "/usr/bin/tr . \\n"; (split words into lines) |
| protected String map = UtilTest.makeJavaCommand(TrApp.class, new String[]{".", "\\n"}); |
| // reduce behave like /usr/bin/uniq. But also prepend lines with R. |
| // command-line combiner does not have any effect any more. |
| protected String reduce = UtilTest.makeJavaCommand(UniqApp.class, new String[]{"R"}); |
| protected String outputExpect = "Rare\t\nRblue\t\nRbunnies\t\nRpink\t\nRred\t\nRroses\t\nRviolets\t\n"; |
| |
| protected ArrayList<String> args = new ArrayList<String>(); |
| protected StreamJob job; |
| |
| public TestStreaming() throws IOException |
| { |
| UtilTest utilTest = new UtilTest(getClass().getName()); |
| utilTest.checkUserDir(); |
| utilTest.redirectIfAntJunit(); |
| setTestDir(new File("target/TestStreaming").getAbsoluteFile()); |
| } |
| |
| /** |
| * Sets root of test working directory and resets any other paths that must be |
| * children of the test working directory. Typical usage is for subclasses |
| * that use HDFS to override the test directory to the form "/tmp/<test name>" |
| * so that on Windows, tests won't attempt to use paths containing a ':' from |
| * the drive specifier. The ':' character is considered invalid by HDFS. |
| * |
| * @param testDir File to set |
| */ |
| protected void setTestDir(File testDir) { |
| TEST_DIR = testDir; |
| OUTPUT_DIR = new File(testDir, "out"); |
| INPUT_FILE = new File(testDir, "input.txt"); |
| } |
| |
| @Before |
| public void setUp() throws IOException { |
| UtilTest.recursiveDelete(TEST_DIR); |
| assertTrue("Creating " + TEST_DIR, TEST_DIR.mkdirs()); |
| args.clear(); |
| } |
| |
| @After |
| public void tearDown() { |
| UtilTest.recursiveDelete(TEST_DIR); |
| } |
| |
| protected String getInputData() { |
| return input; |
| } |
| |
| protected void createInput() throws IOException |
| { |
| DataOutputStream out = getFileSystem().create(new Path( |
| INPUT_FILE.getPath())); |
| out.write(getInputData().getBytes("UTF-8")); |
| out.close(); |
| } |
| |
| protected void setInputOutput() { |
| inputFile = INPUT_FILE.getPath(); |
| outDir = OUTPUT_DIR.getPath(); |
| } |
| |
| protected String[] genArgs() { |
| args.add("-input");args.add(inputFile); |
| args.add("-output");args.add(outDir); |
| args.add("-mapper");args.add(map); |
| args.add("-reducer");args.add(reduce); |
| args.add("-jobconf"); |
| args.add("mapreduce.task.files.preserve.failedtasks=true"); |
| args.add("-jobconf"); |
| args.add("stream.tmpdir="+System.getProperty("test.build.data","/tmp")); |
| |
| String str[] = new String [args.size()]; |
| args.toArray(str); |
| return str; |
| } |
| |
| protected Configuration getConf() { |
| return new Configuration(); |
| } |
| |
| protected FileSystem getFileSystem() throws IOException { |
| return FileSystem.get(getConf()); |
| } |
| |
| protected String getExpectedOutput() { |
| return outputExpect; |
| } |
| |
| protected void checkOutput() throws IOException { |
| Path outPath = new Path(OUTPUT_DIR.getPath(), "part-00000"); |
| FileSystem fs = getFileSystem(); |
| String output = StreamUtil.slurpHadoop(outPath, fs); |
| fs.delete(outPath, true); |
| System.err.println("outEx1=" + getExpectedOutput()); |
| System.err.println(" out1=" + output); |
| assertOutput(getExpectedOutput(), output); |
| } |
| |
| protected void assertOutput(String expectedOutput, String output) throws IOException { |
| String[] words = expectedOutput.split("\t\n"); |
| Set<String> expectedWords = new HashSet<String>(Arrays.asList(words)); |
| words = output.split("\t\n"); |
| Set<String> returnedWords = new HashSet<String>(Arrays.asList(words)); |
| // PrintWriter writer = new PrintWriter(new OutputStreamWriter(new FileOutputStream(new File("/tmp/tucu.txt"), true)), true); |
| // writer.println("** Expected: " + expectedOutput); |
| // writer.println("** Output : " + output); |
| assertTrue(returnedWords.containsAll(expectedWords)); |
| } |
| |
| /** |
| * Runs a streaming job with the given arguments |
| * @return the streaming job return status |
| * @throws IOException |
| */ |
| protected int runStreamJob() throws IOException { |
| setInputOutput(); |
| 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); |
| return job.go(); |
| } |
| |
| @Test |
| public void testCommandLine() throws Exception |
| { |
| int ret = runStreamJob(); |
| assertEquals(0, ret); |
| checkOutput(); |
| } |
| } |