/**
* 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.*;
import junit.framework.TestCase;
import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;
import org.apache.hadoop.io.IntWritable;
import org.apache.hadoop.io.LongWritable;
import org.apache.hadoop.io.Text;
import org.apache.hadoop.fs.FileSystem;
import org.apache.hadoop.fs.Path;
import org.apache.hadoop.mapred.lib.IdentityReducer;
import org.apache.hadoop.conf.Configuration;
import org.apache.hadoop.hdfs.MiniDFSCluster;
/**
* Class to test mapred task's temp directory
*/
public class TestMiniMRTaskTempDir extends TestCase {
private static final Log LOG =
LogFactory.getLog(TestMiniMRTaskTempDir.class.getName());
private MiniMRCluster mr;
private MiniDFSCluster dfs;
private FileSystem fileSys;
/**
* Map class which checks whether temp directory exists
* and check the value of java.io.tmpdir
* Creates a tempfile and checks whether that is created in
* temp directory specified.
*/
public static class MapClass extends MapReduceBase
implements Mapper<LongWritable, Text, Text, IntWritable> {
Path tmpDir;
FileSystem localFs;
public void map (LongWritable key, Text value,
OutputCollector<Text, IntWritable> output,
Reporter reporter) throws IOException {
String tmp = null;
if (localFs.exists(tmpDir)) {
tmp = tmpDir.makeQualified(localFs).toString();
assertEquals(tmp, new Path(System.getProperty("java.io.tmpdir")).
makeQualified(localFs).toString());
} else {
fail("Temp directory "+tmpDir +" doesnt exist.");
}
File tmpFile = File.createTempFile("test", ".tmp");
assertEquals(tmp, new Path(tmpFile.getParent()).
makeQualified(localFs).toString());
}
public void configure(JobConf job) {
tmpDir = new Path(job.get("mapred.child.tmp", "./tmp"));
try {
localFs = FileSystem.getLocal(job);
} catch (IOException ioe) {
ioe.printStackTrace();
fail("IOException in getting localFS");
}
}
}
/**
* Launch tests
* @param conf Configuration of the mapreduce job.
* @param inDir input path
* @param outDir output path
* @param input Input text
* @throws IOException
*/
public void launchTest(JobConf conf,
Path inDir,
Path outDir,
String input)
throws IOException {
// set up the input file system and write input text.
FileSystem inFs = inDir.getFileSystem(conf);
FileSystem outFs = outDir.getFileSystem(conf);
outFs.delete(outDir, true);
if (!inFs.mkdirs(inDir)) {
throw new IOException("Mkdirs failed to create " + inDir.toString());
}
{
// write input into input file
DataOutputStream file = inFs.create(new Path(inDir, "part-0"));
file.writeBytes(input);
file.close();
}
// configure the mapred Job which creates a tempfile in map.
conf.setJobName("testmap");
conf.setMapperClass(MapClass.class);
conf.setReducerClass(IdentityReducer.class);
conf.setNumMapTasks(1);
conf.setNumReduceTasks(0);
FileInputFormat.setInputPaths(conf, inDir);
FileOutputFormat.setOutputPath(conf, outDir);
String TEST_ROOT_DIR = new Path(System.getProperty("test.build.data",
"/tmp")).toString().replace(' ', '+');
conf.set("test.build.data", TEST_ROOT_DIR);
// Launch job with default option for temp dir.
// i.e. temp dir is ./tmp
JobClient.runJob(conf);
outFs.delete(outDir, true);
// Launch job by giving relative path to temp dir.
conf.set("mapred.child.tmp", "../temp");
JobClient.runJob(conf);
outFs.delete(outDir, true);
// Launch job by giving absolute path to temp dir
conf.set("mapred.child.tmp", "/tmp");
JobClient.runJob(conf);
outFs.delete(outDir, true);
}
/**
* Tests task's temp directory.
*
* In this test, we give different values to mapred.child.tmp
* both relative and absolute. And check whether the temp directory
* is created. We also check whether java.io.tmpdir value is same as
* the directory specified. We create a temp file and check if is is
* created in the directory specified.
*/
public void testTaskTempDir(){
try {
// create configuration, dfs, file system and mapred cluster
dfs = new MiniDFSCluster(new Configuration(), 1, true, null);
fileSys = dfs.getFileSystem();
mr = new MiniMRCluster(2, fileSys.getUri().toString(), 1);
JobConf conf = mr.createJobConf();
// intialize input, output directories
Path inDir = new Path("testing/wc/input");
Path outDir = new Path("testing/wc/output");
String input = "The input";
launchTest(conf, inDir, outDir, input);
} catch(Exception e) {
e.printStackTrace();
fail("Exception in testing temp dir");
// close file system and shut down dfs and mapred cluster
try {
if (fileSys != null) {
fileSys.close();
}
if (dfs != null) {
dfs.shutdown();
}
if (mr != null) {
mr.shutdown();
}
} catch (IOException ioe) {
LOG.info("IO exception in closing file system)" );
ioe.printStackTrace();
}
}
}
public static void main(String args[]){
TestMiniMRTaskTempDir test = new TestMiniMRTaskTempDir();
test.testTaskTempDir();
}
}