TestMiniMRMapRedDebugScript.java
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上传日期:2018-01-08
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文件大小:8k
源码类别:
网格计算
开发平台:
Java
- /**
- * 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.DataOutputStream;
- import java.io.IOException;
- import java.io.InputStream;
- import java.net.URI;
- import junit.framework.TestCase;
- import org.apache.commons.logging.Log;
- import org.apache.commons.logging.LogFactory;
- import org.apache.hadoop.conf.Configuration;
- import org.apache.hadoop.hdfs.MiniDFSCluster;
- import org.apache.hadoop.filecache.DistributedCache;
- import org.apache.hadoop.fs.FileSystem;
- import org.apache.hadoop.fs.Path;
- import org.apache.hadoop.io.IntWritable;
- import org.apache.hadoop.io.LongWritable;
- import org.apache.hadoop.io.Text;
- import org.apache.hadoop.mapred.lib.IdentityReducer;
- /**
- * Class to test mapred debug Script
- */
- public class TestMiniMRMapRedDebugScript extends TestCase {
- private static final Log LOG =
- LogFactory.getLog(TestMiniMRMapRedDebugScript.class.getName());
- private MiniMRCluster mr;
- private MiniDFSCluster dfs;
- private FileSystem fileSys;
- /**
- * Fail map class
- */
- public static class MapClass extends MapReduceBase
- implements Mapper<LongWritable, Text, Text, IntWritable> {
- public void map (LongWritable key, Text value,
- OutputCollector<Text, IntWritable> output,
- Reporter reporter) throws IOException {
- System.err.println("Bailing out");
- throw new IOException();
- }
- }
- /**
- * Reads tasklog and returns it as string after trimming it.
- * @param filter Task log filter; can be STDOUT, STDERR,
- * SYSLOG, DEBUGOUT, DEBUGERR
- * @param taskId The task id for which the log has to collected
- * @param isCleanup whether the task is a cleanup attempt or not.
- * @return task log as string
- * @throws IOException
- */
- public static String readTaskLog(TaskLog.LogName filter,
- TaskAttemptID taskId,
- boolean isCleanup)
- throws IOException {
- // string buffer to store task log
- StringBuffer result = new StringBuffer();
- int res;
- // reads the whole tasklog into inputstream
- InputStream taskLogReader = new TaskLog.Reader(taskId, filter, 0, -1, isCleanup);
- // construct string log from inputstream.
- byte[] b = new byte[65536];
- while (true) {
- res = taskLogReader.read(b);
- if (res > 0) {
- result.append(new String(b));
- } else {
- break;
- }
- }
- taskLogReader.close();
- // trim the string and return it
- String str = result.toString();
- str = str.trim();
- return str;
- }
- /**
- * Launches failed map task and debugs the failed task
- * @param conf configuration for the mapred job
- * @param inDir input path
- * @param outDir output path
- * @param debugDir debug directory where script is present
- * @param debugCommand The command to execute script
- * @param input Input text
- * @return the output of debug script
- * @throws IOException
- */
- public String launchFailMapAndDebug(JobConf conf,
- Path inDir,
- Path outDir,
- Path debugDir,
- String debugScript,
- 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 for failing map task.
- conf.setJobName("failmap");
- conf.setMapperClass(MapClass.class);
- conf.setReducerClass(IdentityReducer.class);
- conf.setNumMapTasks(1);
- conf.setNumReduceTasks(0);
- conf.setMapDebugScript(debugScript);
- 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);
- // copy debug script to cache from local file system.
- FileSystem debugFs = debugDir.getFileSystem(conf);
- Path scriptPath = new Path(debugDir,"testscript.txt");
- Path cachePath = new Path("/cacheDir");
- if (!debugFs.mkdirs(cachePath)) {
- throw new IOException("Mkdirs failed to create " + cachePath.toString());
- }
- debugFs.copyFromLocalFile(scriptPath,cachePath);
- URI uri = debugFs.getUri().resolve(cachePath+"/testscript.txt#testscript");
- DistributedCache.createSymlink(conf);
- DistributedCache.addCacheFile(uri, conf);
- RunningJob job =null;
- // run the job. It will fail with IOException.
- try {
- job = new JobClient(conf).submitJob(conf);
- } catch (IOException e) {
- LOG.info("Running Job failed", e);
- }
- JobID jobId = job.getID();
- // construct the task id of first map task of failmap
- TaskAttemptID taskId = new TaskAttemptID(new TaskID(jobId,true, 0), 0);
- // wait for the job to finish.
- while (!job.isComplete()) ;
- // return the output of debugout log.
- return readTaskLog(TaskLog.LogName.DEBUGOUT,taskId, false);
- }
- /**
- * Tests Map task's debug script
- *
- * In this test, we launch a mapreduce program which
- * writes 'Bailing out' to stderr and throws an exception.
- * We will run the script when tsk fails and validate
- * the output of debug out log.
- *
- */
- public void testMapDebugScript() throws Exception {
- try {
- // create configuration, dfs, file system and mapred cluster
- Configuration cnf = new Configuration();
- dfs = new MiniDFSCluster(cnf, 1, true, null);
- fileSys = dfs.getFileSystem();
- mr = new MiniMRCluster(2, fileSys.getName(), 1);
- JobConf conf = mr.createJobConf();
- // intialize input, output and debug directories
- final Path debugDir = new Path("build/test/debug");
- Path inDir = new Path("testing/wc/input");
- Path outDir = new Path("testing/wc/output");
- // initialize debug command and input text
- String debugScript = "./testscript";
- String input = "The input";
- // Launch failed map task and run debug script
- String result = launchFailMapAndDebug(conf,inDir,
- outDir,debugDir, debugScript, input);
- // Assert the output of debug script.
- assertEquals("Test ScriptnBailing out", result);
- } finally {
- // 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.getMessage(), ioe);
- }
- }
- }
- public static void main(String args[]){
- TestMiniMRMapRedDebugScript tmds = new TestMiniMRMapRedDebugScript();
- try {
- tmds.testMapDebugScript();
- } catch (Exception e) {
- LOG.error("Exception in test: "+e.getMessage(), e);
- }
- }
- }