| /** |
| * 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 junit.framework.TestCase; |
| import java.io.*; |
| |
| /** |
| * This class tests hadoopStreaming in MapReduce local mode by giving |
| * empty input to mapper and the mapper generates nonempty output. Since map() |
| * is not called at all, output thread was not getting created and the mapper |
| * was hanging forever. Now this issue is solved. Similarly reducer is also |
| * checked for task completion with empty input and nonempty output. |
| */ |
| public class TestStreamingEmptyInpNonemptyOut extends TestCase |
| { |
| |
| protected File INPUT_FILE = new File("emptyInputFile.txt"); |
| protected File OUTPUT_DIR = new File("out"); |
| protected File SCRIPT_FILE = new File("perlScript.pl"); |
| |
| protected String map = "perlScript.pl"; |
| protected String reduce = "org.apache.hadoop.mapred.lib.IdentityReducer"; |
| protected String script = "#!/usr/bin/perl\nfor($count = 1500; $count >= 1; $count--) {print \"$count \";}"; |
| |
| private StreamJob job; |
| |
| public TestStreamingEmptyInpNonemptyOut() throws IOException |
| { |
| UtilTest utilTest = new UtilTest(getClass().getName()); |
| utilTest.checkUserDir(); |
| utilTest.redirectIfAntJunit(); |
| } |
| |
| protected void createInputAndScript() throws IOException |
| { |
| DataOutputStream out = new DataOutputStream( |
| new FileOutputStream(INPUT_FILE.getAbsoluteFile())); |
| out.close(); |
| |
| out = new DataOutputStream( |
| new FileOutputStream(SCRIPT_FILE.getAbsoluteFile())); |
| out.write(script.getBytes("UTF-8")); |
| out.close(); |
| } |
| |
| protected String[] genArgs() { |
| return new String[] { |
| "-input", INPUT_FILE.getAbsolutePath(), |
| "-output", OUTPUT_DIR.getAbsolutePath(), |
| "-mapper", map, |
| "-reducer", reduce, |
| //"-verbose", |
| //"-jobconf", "stream.debug=set" |
| "-jobconf", "mapreduce.task.files.preserve.failedtasks=true", |
| "-jobconf", "stream.tmpdir="+System.getProperty("test.build.data","/tmp") |
| }; |
| } |
| |
| public void testEmptyInputNonemptyOutput() throws IOException |
| { |
| try { |
| try { |
| OUTPUT_DIR.getAbsoluteFile().delete(); |
| } catch (Exception e) { |
| } |
| |
| createInputAndScript(); |
| boolean mayExit = false; |
| |
| // During tests, the default Configuration will use a local mapred |
| // So don't specify -config or -cluster. |
| // First let us test if mapper doesn't hang for empty i/p and nonempty o/p |
| job = new StreamJob(genArgs(), mayExit); |
| job.go(); |
| File outFile = new File(OUTPUT_DIR, "part-00000").getAbsoluteFile(); |
| outFile.delete(); |
| |
| // Now let us test if reducer doesn't hang for empty i/p and nonempty o/p |
| map = "org.apache.hadoop.mapred.lib.IdentityMapper"; |
| reduce = "perlScript.pl"; |
| job = new StreamJob(genArgs(), mayExit); |
| job.go(); |
| outFile = new File(OUTPUT_DIR, "part-00000").getAbsoluteFile(); |
| outFile.delete(); |
| } finally { |
| File outFileCRC = new File(OUTPUT_DIR, ".part-00000.crc").getAbsoluteFile(); |
| INPUT_FILE.delete(); |
| SCRIPT_FILE.delete(); |
| outFileCRC.delete(); |
| OUTPUT_DIR.getAbsoluteFile().delete(); |
| } |
| } |
| |
| public static void main(String[]args) throws Exception |
| { |
| new TestStreaming().testCommandLine(); |
| } |
| |
| } |