/**
* 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 java.util.*;
import org.apache.commons.logging.*;
import org.apache.hadoop.fs.*;
import org.apache.hadoop.conf.*;
import org.apache.hadoop.mapred.JobTracker.JobTrackerMetrics;
/** Implements MapReduce locally, in-process, for debugging. */
class LocalJobRunner implements JobSubmissionProtocol {
public static final Log LOG =
LogFactory.getLog("org.apache.hadoop.mapred.LocalJobRunner");
private FileSystem fs;
private HashMap jobs = new HashMap();
private Configuration conf;
private int map_tasks = 0;
private int reduce_tasks = 0;
private JobTrackerMetrics myMetrics = null;
public long getProtocolVersion(String protocol, long clientVersion) {
return JobSubmissionProtocol.versionID;
}
private class Job extends Thread
implements TaskUmbilicalProtocol {
private String file;
private String id;
private JobConf job;
private Random random = new Random();
private JobStatus status;
private ArrayList mapIds = new ArrayList();
private MapOutputFile mapoutputFile;
private JobProfile profile;
private Path localFile;
private FileSystem localFs;
public long getProtocolVersion(String protocol, long clientVersion) {
return TaskUmbilicalProtocol.versionID;
}
public Job(String file, Configuration conf) throws IOException {
this.file = file;
this.id = "job_" + newId();
this.mapoutputFile = new MapOutputFile();
this.mapoutputFile.setConf(conf);
this.localFile = new JobConf(conf).getLocalPath("localRunner/"+id+".xml");
this.localFs = FileSystem.getLocal(conf);
fs.copyToLocalFile(new Path(file), localFile);
this.job = new JobConf(localFile);
profile = new JobProfile(job.getUser(), id, file,
"http://localhost:8080/", job.getJobName());
status = new JobStatus(id, 0.0f, 0.0f, JobStatus.RUNNING);
jobs.put(id, this);
this.start();
}
JobProfile getProfile() {
return profile;
}
public void run() {
try {
// split input into minimum number of splits
InputSplit[] splits;
splits = job.getInputFormat().getSplits(job, 1);
String jobId = profile.getJobId();
// run a map task for each split
job.setNumReduceTasks(1); // force a single reduce task
for (int i = 0; i < splits.length; i++) {
String mapId = "map_" + newId() ;
mapIds.add(mapId);
MapTask map = new MapTask(jobId, file, "tip_m_" + mapId,
mapId, i,
splits[i]);
JobConf localConf = new JobConf(job);
map.localizeConfiguration(localConf);
map.setConf(localConf);
map_tasks += 1;
myMetrics.launchMap();
map.run(localConf, this);
myMetrics.completeMap();
map_tasks -= 1;
}
// move map output to reduce input
String reduceId = "reduce_" + newId();
for (int i = 0; i < mapIds.size(); i++) {
String mapId = (String)mapIds.get(i);
Path mapOut = this.mapoutputFile.getOutputFile(mapId);
Path reduceIn = this.mapoutputFile.getInputFile(i, reduceId);
if (!localFs.mkdirs(reduceIn.getParent())) {
throw new IOException("Mkdirs failed to create " +
reduceIn.getParent().toString());
}
if (!localFs.rename(mapOut, reduceIn))
throw new IOException("Couldn't rename " + mapOut);
this.mapoutputFile.removeAll(mapId);
}
{
ReduceTask reduce = new ReduceTask(jobId, file,
"tip_r_0001", reduceId, 0, mapIds.size());
JobConf localConf = new JobConf(job);
reduce.localizeConfiguration(localConf);
reduce.setConf(localConf);
reduce_tasks += 1;
myMetrics.launchReduce();
reduce.run(localConf, this);
myMetrics.completeReduce();
reduce_tasks -= 1;
}
this.mapoutputFile.removeAll(reduceId);
this.status.setRunState(JobStatus.SUCCEEDED);
} catch (Throwable t) {
this.status.setRunState(JobStatus.FAILED);
LOG.warn(id, t);
} finally {
try {
fs.delete(new Path(file).getParent()); // delete submit dir
localFs.delete(localFile); // delete local copy
} catch (IOException e) {
LOG.warn("Error cleaning up "+id+": "+e);
}
}
}
private String newId() {
return Integer.toString(Math.abs(random.nextInt()),36);
}
// TaskUmbilicalProtocol methods
public Task getTask(String taskid) { return null; }
public void progress(String taskId, float progress, String state,
TaskStatus.Phase phase) {
LOG.info(state);
float taskIndex = mapIds.indexOf(taskId);
if (taskIndex >= 0) { // mapping
float numTasks = mapIds.size();
status.setMapProgress(taskIndex/numTasks + progress/numTasks);
} else {
status.setReduceProgress(progress);
}
// ignore phase
}
public void reportDiagnosticInfo(String taskid, String trace) {
// Ignore for now
}
public boolean ping(String taskid) throws IOException {
return true;
}
public void done(String taskId) throws IOException {
int taskIndex = mapIds.indexOf(taskId);
if (taskIndex >= 0) { // mapping
status.setMapProgress(1.0f);
} else {
status.setReduceProgress(1.0f);
}
}
public synchronized void fsError(String message) throws IOException {
LOG.fatal("FSError: "+ message);
}
}
public LocalJobRunner(Configuration conf) throws IOException {
this.fs = FileSystem.get(conf);
this.conf = conf;
myMetrics = new JobTrackerMetrics();
}
// JobSubmissionProtocol methods
public JobStatus submitJob(String jobFile) throws IOException {
return new Job(jobFile, this.conf).status;
}
public void killJob(String id) {
((Thread)jobs.get(id)).stop();
}
public JobProfile getJobProfile(String id) {
Job job = (Job)jobs.get(id);
return job.getProfile();
}
public TaskReport[] getMapTaskReports(String id) {
return new TaskReport[0];
}
public TaskReport[] getReduceTaskReports(String id) {
return new TaskReport[0];
}
public JobStatus getJobStatus(String id) {
Job job = (Job)jobs.get(id);
return job.status;
}
public String getFilesystemName() throws IOException {
return fs.getName();
}
public ClusterStatus getClusterStatus() {
return new ClusterStatus(1, map_tasks, reduce_tasks, 1);
}
public JobStatus[] jobsToComplete() {return null;}
public TaskCompletionEvent[] getTaskCompletionEvents(
String jobid, int fromEventId) throws IOException{
return TaskCompletionEvent.EMPTY_ARRAY;
}
}