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MAPREDUCE-3711. Fixed MR AM recovery so that only single selected task output is recovered and thus reduce the unnecessarily bloated recovery time. Contributed by Robert Joseph Evans. 

svn merge --ignore-ancestry -c 1240413 ../../trunk/


git-svn-id: https://svn.apache.org/repos/asf/hadoop/common/branches/branch-0.23@1240414 13f79535-47bb-0310-9956-ffa450edef68
This commit is contained in:
Vinod Kumar Vavilapalli 2012-02-04 00:06:24 +00:00
parent 2c20d0a547
commit 4affe6d979
15 changed files with 754 additions and 604 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

4
hadoop-mapreduce-project/CHANGES.txt
View File

@ -628,6 +628,10 @@ Release 0.23.1 - Unreleased
MAPREDUCE-3727. jobtoken location property in jobconf refers to wrong
jobtoken file (tucu)
MAPREDUCE-3711. Fixed MR AM recovery so that only single selected task
output is recovered and thus reduce the unnecessarily bloated recovery
time. (Robert Joseph Evans via vinodkv)
Release 0.23.0 - 2011-11-01
INCOMPATIBLE CHANGES

1
hadoop-mapreduce-project/hadoop-mapreduce-client/hadoop-mapreduce-client-app/src/main/java/org/apache/hadoop/mapreduce/v2/app/job/impl/TaskImpl.java
View File

@ -559,6 +559,7 @@ public abstract class TaskImpl implements Task, EventHandler<TaskEvent> {
}
private void internalError(TaskEventType type) {
LOG.error("Invalid event " + type + " on Task " + this.taskId);
eventHandler.handle(new JobDiagnosticsUpdateEvent(
this.taskId.getJobId(), "Invalid event " + type +
" on Task " + this.taskId));

1
hadoop-mapreduce-project/hadoop-mapreduce-client/hadoop-mapreduce-client-app/src/main/java/org/apache/hadoop/mapreduce/v2/app/local/LocalContainerAllocator.java
View File

@ -103,6 +103,7 @@ public class LocalContainerAllocator extends RMCommunicator
// This can happen when the connection to the RM has gone down. Keep
// re-trying until the retryInterval has expired.
if (System.currentTimeMillis() - retrystartTime >= retryInterval) {
LOG.error("Could not contact RM after " + retryInterval + " milliseconds.");
eventHandler.handle(new JobEvent(this.getJob().getID(),
JobEventType.INTERNAL_ERROR));
throw new YarnException("Could not contact RM after " +

12
hadoop-mapreduce-project/hadoop-mapreduce-client/hadoop-mapreduce-client-app/src/main/java/org/apache/hadoop/mapreduce/v2/app/recover/RecoveryService.java
View File

@ -32,8 +32,10 @@ import org.apache.hadoop.conf.Configuration;
import org.apache.hadoop.fs.FSDataInputStream;
import org.apache.hadoop.fs.FileContext;
import org.apache.hadoop.fs.Path;
import org.apache.hadoop.mapreduce.MRJobConfig;
import org.apache.hadoop.mapreduce.OutputCommitter;
import org.apache.hadoop.mapreduce.TaskAttemptContext;
import org.apache.hadoop.mapreduce.TaskType;
import org.apache.hadoop.mapreduce.TypeConverter;
import org.apache.hadoop.mapreduce.jobhistory.JobHistoryParser;
import org.apache.hadoop.mapreduce.jobhistory.JobHistoryParser.JobInfo;
@ -359,15 +361,23 @@ public class RecoveryService extends CompositeService implements Recovery {
TaskAttemptContext taskContext = new TaskAttemptContextImpl(getConfig(),
attInfo.getAttemptId());
try {
TaskType type = taskContext.getTaskAttemptID().getTaskID().getTaskType();
int numReducers = taskContext.getConfiguration().getInt(MRJobConfig.NUM_REDUCES, 1);
if(type == TaskType.REDUCE || (type == TaskType.MAP && numReducers <= 0)) {
committer.recoverTask(taskContext);
LOG.info("Recovered output from task attempt " + attInfo.getAttemptId());
} else {
LOG.info("Will not try to recover output for "
+ taskContext.getTaskAttemptID());
}
} catch (IOException e) {
LOG.error("Caught an exception while trying to recover task "+aId, e);
actualHandler.handle(new JobDiagnosticsUpdateEvent(
aId.getTaskId().getJobId(), "Error in recovering task output " +
e.getMessage()));
actualHandler.handle(new JobEvent(aId.getTaskId().getJobId(),
JobEventType.INTERNAL_ERROR));
}
LOG.info("Recovered output from task attempt " + attInfo.getAttemptId());
// send the done event
LOG.info("Sending done event to " + aId);

1
hadoop-mapreduce-project/hadoop-mapreduce-client/hadoop-mapreduce-client-app/src/main/java/org/apache/hadoop/mapreduce/v2/app/rm/RMContainerAllocator.java
View File

@ -543,6 +543,7 @@ public class RMContainerAllocator extends RMContainerRequestor
// This can happen when the connection to the RM has gone down. Keep
// re-trying until the retryInterval has expired.
if (System.currentTimeMillis() - retrystartTime >= retryInterval) {
LOG.error("Could not contact RM after " + retryInterval + " milliseconds.");
eventHandler.handle(new JobEvent(this.getJob().getID(),
JobEventType.INTERNAL_ERROR));
throw new YarnException("Could not contact RM after " +

146
hadoop-mapreduce-project/hadoop-mapreduce-client/hadoop-mapreduce-client-app/src/test/java/org/apache/hadoop/mapreduce/v2/app/TestRecovery.java
View File

@ -61,6 +61,7 @@ import org.apache.hadoop.yarn.event.Dispatcher;
import org.apache.hadoop.yarn.event.EventHandler;
import org.junit.Test;
@SuppressWarnings({"unchecked", "rawtypes"})
public class TestRecovery {
private static final Log LOG = LogFactory.getLog(TestRecovery.class);
@ -349,6 +350,151 @@ public class TestRecovery {
validateOutput();
}
@Test
public void testOutputRecoveryMapsOnly() throws Exception {
int runCount = 0;
MRApp app = new MRAppWithHistory(2, 1, false, this.getClass().getName(),
true, ++runCount);
Configuration conf = new Configuration();
conf.setBoolean("mapred.mapper.new-api", true);
conf.setBoolean("mapred.reducer.new-api", true);
conf.setBoolean(MRJobConfig.JOB_UBERTASK_ENABLE, false);
conf.set(FileOutputFormat.OUTDIR, outputDir.toString());
Job job = app.submit(conf);
app.waitForState(job, JobState.RUNNING);
Assert.assertEquals("No of tasks not correct",
3, job.getTasks().size());
Iterator<Task> it = job.getTasks().values().iterator();
Task mapTask1 = it.next();
Task mapTask2 = it.next();
Task reduceTask1 = it.next();
// all maps must be running
app.waitForState(mapTask1, TaskState.RUNNING);
TaskAttempt task1Attempt1 = mapTask1.getAttempts().values().iterator()
.next();
//before sending the TA_DONE, event make sure attempt has come to
//RUNNING state
app.waitForState(task1Attempt1, TaskAttemptState.RUNNING);
// write output corresponding to map1 (This is just to validate that it is
//no included in the output)
writeBadOutput(task1Attempt1, conf);
//send the done signal to the map
app.getContext().getEventHandler().handle(
new TaskAttemptEvent(
task1Attempt1.getID(),
TaskAttemptEventType.TA_DONE));
//wait for map task to complete
app.waitForState(mapTask1, TaskState.SUCCEEDED);
// Verify the shuffle-port
Assert.assertEquals(5467, task1Attempt1.getShufflePort());
//stop the app before the job completes.
app.stop();
//rerun
//in rerun the map will be recovered from previous run
app = new MRAppWithHistory(2, 1, false, this.getClass().getName(), false,
++runCount);
conf = new Configuration();
conf.setBoolean(MRJobConfig.MR_AM_JOB_RECOVERY_ENABLE, true);
conf.setBoolean("mapred.mapper.new-api", true);
conf.setBoolean("mapred.reducer.new-api", true);
conf.set(FileOutputFormat.OUTDIR, outputDir.toString());
conf.setBoolean(MRJobConfig.JOB_UBERTASK_ENABLE, false);
job = app.submit(conf);
app.waitForState(job, JobState.RUNNING);
Assert.assertEquals("No of tasks not correct",
3, job.getTasks().size());
it = job.getTasks().values().iterator();
mapTask1 = it.next();
mapTask2 = it.next();
reduceTask1 = it.next();
// map will be recovered, no need to send done
app.waitForState(mapTask1, TaskState.SUCCEEDED);
// Verify the shuffle-port after recovery
task1Attempt1 = mapTask1.getAttempts().values().iterator().next();
Assert.assertEquals(5467, task1Attempt1.getShufflePort());
app.waitForState(mapTask2, TaskState.RUNNING);
TaskAttempt task2Attempt1 = mapTask2.getAttempts().values().iterator()
.next();
//before sending the TA_DONE, event make sure attempt has come to
//RUNNING state
app.waitForState(task2Attempt1, TaskAttemptState.RUNNING);
//send the done signal to the map
app.getContext().getEventHandler().handle(
new TaskAttemptEvent(
task2Attempt1.getID(),
TaskAttemptEventType.TA_DONE));
//wait for map task to complete
app.waitForState(mapTask2, TaskState.SUCCEEDED);
// Verify the shuffle-port
Assert.assertEquals(5467, task2Attempt1.getShufflePort());
app.waitForState(reduceTask1, TaskState.RUNNING);
TaskAttempt reduce1Attempt1 = reduceTask1.getAttempts().values().iterator().next();
// write output corresponding to reduce1
writeOutput(reduce1Attempt1, conf);
//send the done signal to the 1st reduce
app.getContext().getEventHandler().handle(
new TaskAttemptEvent(
reduce1Attempt1.getID(),
TaskAttemptEventType.TA_DONE));
//wait for first reduce task to complete
app.waitForState(reduceTask1, TaskState.SUCCEEDED);
app.waitForState(job, JobState.SUCCEEDED);
app.verifyCompleted();
validateOutput();
}
private void writeBadOutput(TaskAttempt attempt, Configuration conf)
throws Exception {
TaskAttemptContext tContext = new TaskAttemptContextImpl(conf,
TypeConverter.fromYarn(attempt.getID()));
TextOutputFormat<?, ?> theOutputFormat = new TextOutputFormat();
RecordWriter theRecordWriter = theOutputFormat
.getRecordWriter(tContext);
NullWritable nullWritable = NullWritable.get();
try {
theRecordWriter.write(key2, val2);
theRecordWriter.write(null, nullWritable);
theRecordWriter.write(null, val2);
theRecordWriter.write(nullWritable, val1);
theRecordWriter.write(key1, nullWritable);
theRecordWriter.write(key2, null);
theRecordWriter.write(null, null);
theRecordWriter.write(key1, val1);
} finally {
theRecordWriter.close(tContext);
}
OutputFormat outputFormat = ReflectionUtils.newInstance(
tContext.getOutputFormatClass(), conf);
OutputCommitter committer = outputFormat.getOutputCommitter(tContext);
committer.commitTask(tContext);
}
private void writeOutput(TaskAttempt attempt, Configuration conf)
throws Exception {
TaskAttemptContext tContext = new TaskAttemptContextImpl(conf,

406
hadoop-mapreduce-project/hadoop-mapreduce-client/hadoop-mapreduce-client-core/src/main/java/org/apache/hadoop/mapred/FileOutputCommitter.java
View File

@ -19,14 +19,12 @@
package org.apache.hadoop.mapred;
import java.io.IOException;
import java.net.URI;
import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;
import org.apache.hadoop.classification.InterfaceAudience;
import org.apache.hadoop.classification.InterfaceAudience.Private;
import org.apache.hadoop.classification.InterfaceStability;
import org.apache.hadoop.fs.FileStatus;
import org.apache.hadoop.fs.FileSystem;
import org.apache.hadoop.fs.Path;
/** An {@link OutputCommitter} that commits files specified
@ -42,280 +40,140 @@ public class FileOutputCommitter extends OutputCommitter {
/**
* Temporary directory name
*/
public static final String TEMP_DIR_NAME = "_temporary";
public static final String SUCCEEDED_FILE_NAME = "_SUCCESS";
public static final String TEMP_DIR_NAME =
org.apache.hadoop.mapreduce.lib.output.FileOutputCommitter.PENDING_DIR_NAME;
public static final String SUCCEEDED_FILE_NAME =
org.apache.hadoop.mapreduce.lib.output.FileOutputCommitter.SUCCEEDED_FILE_NAME;
static final String SUCCESSFUL_JOB_OUTPUT_DIR_MARKER =
"mapreduce.fileoutputcommitter.marksuccessfuljobs";
org.apache.hadoop.mapreduce.lib.output.FileOutputCommitter.SUCCESSFUL_JOB_OUTPUT_DIR_MARKER;
private static Path getOutputPath(JobContext context) {
JobConf conf = context.getJobConf();
return FileOutputFormat.getOutputPath(conf);
}
private static Path getOutputPath(TaskAttemptContext context) {
JobConf conf = context.getJobConf();
return FileOutputFormat.getOutputPath(conf);
}
private org.apache.hadoop.mapreduce.lib.output.FileOutputCommitter wrapped = null;
private org.apache.hadoop.mapreduce.lib.output.FileOutputCommitter
getWrapped(JobContext context) throws IOException {
if(wrapped == null) {
wrapped = new org.apache.hadoop.mapreduce.lib.output.FileOutputCommitter(
getOutputPath(context), context);
}
return wrapped;
}
private org.apache.hadoop.mapreduce.lib.output.FileOutputCommitter
getWrapped(TaskAttemptContext context) throws IOException {
if(wrapped == null) {
wrapped = new org.apache.hadoop.mapreduce.lib.output.FileOutputCommitter(
getOutputPath(context), context);
}
return wrapped;
}
/**
* Compute the path where the output of a given job attempt will be placed.
* @param context the context of the job. This is used to get the
* application attempt id.
* @return the path to store job attempt data.
*/
@Private
Path getJobAttemptPath(JobContext context) {
return org.apache.hadoop.mapreduce.lib.output.FileOutputCommitter
.getJobAttemptPath(context, getOutputPath(context));
}
@Private
Path getTaskAttemptPath(TaskAttemptContext context) throws IOException {
return getTaskAttemptPath(context, getOutputPath(context));
}
private Path getTaskAttemptPath(TaskAttemptContext context, Path out) throws IOException {
Path workPath = FileOutputFormat.getWorkOutputPath(context.getJobConf());
if(workPath == null) {
return org.apache.hadoop.mapreduce.lib.output.FileOutputCommitter
.getTaskAttemptPath(context, out);
}
return workPath;
}
/**
* Compute the path where the output of a committed task is stored until
* the entire job is committed.
* @param context the context of the task attempt
* @return the path where the output of a committed task is stored until
* the entire job is committed.
*/
Path getCommittedTaskPath(TaskAttemptContext context) {
return org.apache.hadoop.mapreduce.lib.output.FileOutputCommitter
.getCommittedTaskPath(context, getOutputPath(context));
}
public Path getWorkPath(TaskAttemptContext context, Path outputPath)
throws IOException {
return getTaskAttemptPath(context, outputPath);
}
@Override
public void setupJob(JobContext context) throws IOException {
JobConf conf = context.getJobConf();
Path outputPath = FileOutputFormat.getOutputPath(conf);
if (outputPath != null) {
Path tmpDir =
new Path(outputPath, getJobAttemptBaseDirName(context) +
Path.SEPARATOR + FileOutputCommitter.TEMP_DIR_NAME);
FileSystem fileSys = tmpDir.getFileSystem(conf);
if (!fileSys.mkdirs(tmpDir)) {
LOG.error("Mkdirs failed to create " + tmpDir.toString());
}
}
}
// True if the job requires output.dir marked on successful job.
// Note that by default it is set to true.
private boolean shouldMarkOutputDir(JobConf conf) {
return conf.getBoolean(SUCCESSFUL_JOB_OUTPUT_DIR_MARKER, true);
getWrapped(context).setupJob(context);
}
@Override
public void commitJob(JobContext context) throws IOException {
//delete the task temp directory from the current jobtempdir
JobConf conf = context.getJobConf();
Path outputPath = FileOutputFormat.getOutputPath(conf);
if (outputPath != null) {
FileSystem outputFileSystem = outputPath.getFileSystem(conf);
Path tmpDir = new Path(outputPath, getJobAttemptBaseDirName(context) +
Path.SEPARATOR + FileOutputCommitter.TEMP_DIR_NAME);
FileSystem fileSys = tmpDir.getFileSystem(context.getConfiguration());
if (fileSys.exists(tmpDir)) {
fileSys.delete(tmpDir, true);
} else {
LOG.warn("Task temp dir could not be deleted " + tmpDir);
}
//move the job output to final place
Path jobOutputPath =
new Path(outputPath, getJobAttemptBaseDirName(context));
moveJobOutputs(outputFileSystem,
jobOutputPath, outputPath, jobOutputPath);
// delete the _temporary folder in the output folder
cleanupJob(context);
// check if the output-dir marking is required
if (shouldMarkOutputDir(context.getJobConf())) {
// create a _success file in the output folder
markOutputDirSuccessful(context);
}
}
}
// Create a _success file in the job's output folder
private void markOutputDirSuccessful(JobContext context) throws IOException {
JobConf conf = context.getJobConf();
// get the o/p path
Path outputPath = FileOutputFormat.getOutputPath(conf);
if (outputPath != null) {
// get the filesys
FileSystem fileSys = outputPath.getFileSystem(conf);
// create a file in the output folder to mark the job completion
Path filePath = new Path(outputPath, SUCCEEDED_FILE_NAME);
fileSys.create(filePath).close();
}
}
private void moveJobOutputs(FileSystem fs, final Path origJobOutputPath,
Path finalOutputDir, Path jobOutput) throws IOException {
LOG.debug("Told to move job output from " + jobOutput
+ " to " + finalOutputDir +
" and orig job output path is " + origJobOutputPath);
if (fs.isFile(jobOutput)) {
Path finalOutputPath =
getFinalPath(fs, finalOutputDir, jobOutput, origJobOutputPath);
if (!fs.rename(jobOutput, finalOutputPath)) {
if (!fs.delete(finalOutputPath, true)) {
throw new IOException("Failed to delete earlier output of job");
}
if (!fs.rename(jobOutput, finalOutputPath)) {
throw new IOException("Failed to save output of job");
}
}
LOG.debug("Moved job output file from " + jobOutput + " to " +
finalOutputPath);
} else if (fs.getFileStatus(jobOutput).isDirectory()) {
LOG.debug("Job output file " + jobOutput + " is a dir");
FileStatus[] paths = fs.listStatus(jobOutput);
Path finalOutputPath =
getFinalPath(fs, finalOutputDir, jobOutput, origJobOutputPath);
fs.mkdirs(finalOutputPath);
LOG.debug("Creating dirs along job output path " + finalOutputPath);
if (paths != null) {
for (FileStatus path : paths) {
moveJobOutputs(fs, origJobOutputPath, finalOutputDir, path.getPath());
}
}
}
getWrapped(context).commitJob(context);
}
@Override
@Deprecated
public void cleanupJob(JobContext context) throws IOException {
JobConf conf = context.getJobConf();
// do the clean up of temporary directory
Path outputPath = FileOutputFormat.getOutputPath(conf);
if (outputPath != null) {
Path tmpDir = new Path(outputPath, FileOutputCommitter.TEMP_DIR_NAME);
FileSystem fileSys = tmpDir.getFileSystem(conf);
context.getProgressible().progress();
if (fileSys.exists(tmpDir)) {
fileSys.delete(tmpDir, true);
} else {
LOG.warn("Output Path is Null in cleanup");
}
}
getWrapped(context).cleanupJob(context);
}
@Override
public void abortJob(JobContext context, int runState)
throws IOException {
// simply delete the _temporary dir from the o/p folder of the job
cleanupJob(context);
JobStatus.State state;
if(runState == JobStatus.State.RUNNING.getValue()) {
state = JobStatus.State.RUNNING;
} else if(runState == JobStatus.State.SUCCEEDED.getValue()) {
state = JobStatus.State.SUCCEEDED;
} else if(runState == JobStatus.State.FAILED.getValue()) {
state = JobStatus.State.FAILED;
} else if(runState == JobStatus.State.PREP.getValue()) {
state = JobStatus.State.PREP;
} else if(runState == JobStatus.State.KILLED.getValue()) {
state = JobStatus.State.KILLED;
} else {
throw new IllegalArgumentException(runState+" is not a valid runState.");
}
getWrapped(context).abortJob(context, state);
}
public void setupTask(TaskAttemptContext context) throws IOException {
// FileOutputCommitter's setupTask doesn't do anything. Because the
// temporary task directory is created on demand when the
// task is writing.
getWrapped(context).setupTask(context);
}
public void commitTask(TaskAttemptContext context)
throws IOException {
Path taskOutputPath = getTempTaskOutputPath(context);
TaskAttemptID attemptId = context.getTaskAttemptID();
JobConf job = context.getJobConf();
if (taskOutputPath != null) {
FileSystem fs = taskOutputPath.getFileSystem(job);
context.getProgressible().progress();
if (fs.exists(taskOutputPath)) {
// Move the task outputs to the current job attempt output dir
JobConf conf = context.getJobConf();
Path outputPath = FileOutputFormat.getOutputPath(conf);
FileSystem outputFileSystem = outputPath.getFileSystem(conf);
Path jobOutputPath = new Path(outputPath, getJobTempDirName(context));
moveTaskOutputs(context, outputFileSystem, jobOutputPath,
taskOutputPath);
// Delete the temporary task-specific output directory
if (!fs.delete(taskOutputPath, true)) {
LOG.info("Failed to delete the temporary output" +
" directory of task: " + attemptId + " - " + taskOutputPath);
}
LOG.info("Saved output of task '" + attemptId + "' to " +
jobOutputPath);
}
}
}
private void moveTaskOutputs(TaskAttemptContext context,
FileSystem fs,
Path jobOutputDir,
Path taskOutput)
throws IOException {
TaskAttemptID attemptId = context.getTaskAttemptID();
context.getProgressible().progress();
LOG.debug("Told to move taskoutput from " + taskOutput
+ " to " + jobOutputDir);
if (fs.isFile(taskOutput)) {
Path finalOutputPath = getFinalPath(fs, jobOutputDir, taskOutput,
getTempTaskOutputPath(context));
if (!fs.rename(taskOutput, finalOutputPath)) {
if (!fs.delete(finalOutputPath, true)) {
throw new IOException("Failed to delete earlier output of task: " +
attemptId);
}
if (!fs.rename(taskOutput, finalOutputPath)) {
throw new IOException("Failed to save output of task: " +
attemptId);
}
}
LOG.debug("Moved " + taskOutput + " to " + finalOutputPath);
} else if(fs.getFileStatus(taskOutput).isDirectory()) {
LOG.debug("Taskoutput " + taskOutput + " is a dir");
FileStatus[] paths = fs.listStatus(taskOutput);
Path finalOutputPath = getFinalPath(fs, jobOutputDir, taskOutput,
getTempTaskOutputPath(context));
fs.mkdirs(finalOutputPath);
LOG.debug("Creating dirs along path " + finalOutputPath);
if (paths != null) {
for (FileStatus path : paths) {
moveTaskOutputs(context, fs, jobOutputDir, path.getPath());
}
}
}
@Override
public void commitTask(TaskAttemptContext context) throws IOException {
getWrapped(context).commitTask(context, getTaskAttemptPath(context));
}
@Override
public void abortTask(TaskAttemptContext context) throws IOException {
Path taskOutputPath = getTempTaskOutputPath(context);
if (taskOutputPath != null) {
FileSystem fs = taskOutputPath.getFileSystem(context.getJobConf());
context.getProgressible().progress();
fs.delete(taskOutputPath, true);
}
}
@SuppressWarnings("deprecation")
private Path getFinalPath(FileSystem fs, Path jobOutputDir, Path taskOutput,
Path taskOutputPath) throws IOException {
URI taskOutputUri = taskOutput.makeQualified(fs).toUri();
URI taskOutputPathUri = taskOutputPath.makeQualified(fs).toUri();
URI relativePath = taskOutputPathUri.relativize(taskOutputUri);
if (taskOutputUri == relativePath) {
//taskOutputPath is not a parent of taskOutput
throw new IOException("Can not get the relative path: base = " +
taskOutputPathUri + " child = " + taskOutputUri);
}
if (relativePath.getPath().length() > 0) {
return new Path(jobOutputDir, relativePath.getPath());
} else {
return jobOutputDir;
}
getWrapped(context).abortTask(context, getTaskAttemptPath(context));
}
@Override
public boolean needsTaskCommit(TaskAttemptContext context)
throws IOException {
Path taskOutputPath = getTempTaskOutputPath(context);
if (taskOutputPath != null) {
context.getProgressible().progress();
// Get the file-system for the task output directory
FileSystem fs = taskOutputPath.getFileSystem(context.getJobConf());
// since task output path is created on demand,
// if it exists, task needs a commit
if (fs.exists(taskOutputPath)) {
return true;
}
}
return false;
}
Path getTempTaskOutputPath(TaskAttemptContext taskContext)
throws IOException {
JobConf conf = taskContext.getJobConf();
Path outputPath = FileOutputFormat.getOutputPath(conf);
if (outputPath != null) {
Path p = new Path(outputPath,
(FileOutputCommitter.TEMP_DIR_NAME + Path.SEPARATOR +
"_" + taskContext.getTaskAttemptID().toString()));
FileSystem fs = p.getFileSystem(conf);
return p.makeQualified(fs);
}
return null;
}
Path getWorkPath(TaskAttemptContext taskContext, Path basePath)
throws IOException {
// ${mapred.out.dir}/_temporary
Path jobTmpDir = new Path(basePath, FileOutputCommitter.TEMP_DIR_NAME);
FileSystem fs = jobTmpDir.getFileSystem(taskContext.getJobConf());
if (!fs.exists(jobTmpDir)) {
throw new IOException("The temporary job-output directory " +
jobTmpDir.toString() + " doesn't exist!");
}
// ${mapred.out.dir}/_temporary/_${taskid}
String taskid = taskContext.getTaskAttemptID().toString();
Path taskTmpDir = new Path(jobTmpDir, "_" + taskid);
if (!fs.mkdirs(taskTmpDir)) {
throw new IOException("Mkdirs failed to create "
+ taskTmpDir.toString());
}
return taskTmpDir;
return getWrapped(context).needsTaskCommit(context, getTaskAttemptPath(context));
}
@Override
@ -326,54 +184,6 @@ public class FileOutputCommitter extends OutputCommitter {
@Override
public void recoverTask(TaskAttemptContext context)
throws IOException {
Path outputPath = FileOutputFormat.getOutputPath(context.getJobConf());
context.progress();
Path jobOutputPath = new Path(outputPath, getJobTempDirName(context));
int previousAttempt =
context.getConfiguration().getInt(
MRConstants.APPLICATION_ATTEMPT_ID, 0) - 1;
if (previousAttempt < 0) {
LOG.warn("Cannot recover task output for first attempt...");
return;
}
FileSystem outputFileSystem =
outputPath.getFileSystem(context.getJobConf());
Path pathToRecover =
new Path(outputPath, getJobAttemptBaseDirName(previousAttempt));
if (outputFileSystem.exists(pathToRecover)) {
// Move the task outputs to their final place
LOG.debug("Trying to recover task from " + pathToRecover
+ " into " + jobOutputPath);
moveJobOutputs(outputFileSystem,
pathToRecover, jobOutputPath, pathToRecover);
LOG.info("Saved output of job to " + jobOutputPath);
}
}
protected static String getJobAttemptBaseDirName(JobContext context) {
int appAttemptId =
context.getJobConf().getInt(
MRConstants.APPLICATION_ATTEMPT_ID, 0);
return getJobAttemptBaseDirName(appAttemptId);
}
protected static String getJobTempDirName(TaskAttemptContext context) {
int appAttemptId =
context.getJobConf().getInt(
MRConstants.APPLICATION_ATTEMPT_ID, 0);
return getJobAttemptBaseDirName(appAttemptId);
}
protected static String getJobAttemptBaseDirName(int appAttemptId) {
return FileOutputCommitter.TEMP_DIR_NAME + Path.SEPARATOR +
+ appAttemptId;
}
protected static String getTaskAttemptBaseDirName(
TaskAttemptContext context) {
return getJobTempDirName(context) + Path.SEPARATOR +
FileOutputCommitter.TEMP_DIR_NAME + Path.SEPARATOR +
"_" + context.getTaskAttemptID().toString();
getWrapped(context).recoverTask(context);
}
}

2
hadoop-mapreduce-project/hadoop-mapreduce-client/hadoop-mapreduce-client-core/src/main/java/org/apache/hadoop/mapred/Task.java
View File

@ -525,7 +525,7 @@ abstract public class Task implements Writable, Configurable {
if (outputPath != null) {
if ((committer instanceof FileOutputCommitter)) {
FileOutputFormat.setWorkOutputPath(conf,
((FileOutputCommitter)committer).getTempTaskOutputPath(taskContext));
((FileOutputCommitter)committer).getTaskAttemptPath(taskContext));
} else {
FileOutputFormat.setWorkOutputPath(conf, outputPath);
}

44
hadoop-mapreduce-project/hadoop-mapreduce-client/hadoop-mapreduce-client-core/src/main/java/org/apache/hadoop/mapreduce/OutputCommitter.java
View File

@ -51,17 +51,21 @@ import org.apache.hadoop.classification.InterfaceStability;
* Discard the task commit.
* </li>
* </ol>
* The methods in this class can be called from several different processes and
* from several different contexts. It is important to know which process and
* which context each is called from. Each method should be marked accordingly
* in its documentation.
*
* @see org.apache.hadoop.mapreduce.lib.output.FileOutputCommitter
* @see JobContext
* @see TaskAttemptContext
*
*/
@InterfaceAudience.Public
@InterfaceStability.Stable
public abstract class OutputCommitter {
/**
* For the framework to setup the job output during initialization
* For the framework to setup the job output during initialization. This is
* called from the application master process for the entire job.
*
* @param jobContext Context of the job whose output is being written.
* @throws IOException if temporary output could not be created
@ -69,11 +73,12 @@ public abstract class OutputCommitter {
public abstract void setupJob(JobContext jobContext) throws IOException;
/**
* For cleaning up the job's output after job completion
* For cleaning up the job's output after job completion. This is called
* from the application master process for the entire job.
*
* @param jobContext Context of the job whose output is being written.
* @throws IOException
* @deprecated Use {@link #commitJob(JobContext)} or
* @deprecated Use {@link #commitJob(JobContext)} and
* {@link #abortJob(JobContext, JobStatus.State)} instead.
*/
@Deprecated
@ -81,7 +86,8 @@ public abstract class OutputCommitter {
/**
* For committing job's output after successful job completion. Note that this
* is invoked for jobs with final runstate as SUCCESSFUL.
* is invoked for jobs with final runstate as SUCCESSFUL. This is called
* from the application master process for the entire job.
*
* @param jobContext Context of the job whose output is being written.
* @throws IOException
@ -94,7 +100,8 @@ public abstract class OutputCommitter {
/**
* For aborting an unsuccessful job's output. Note that this is invoked for
* jobs with final runstate as {@link JobStatus.State#FAILED} or
* {@link JobStatus.State#KILLED}.
* {@link JobStatus.State#KILLED}. This is called from the application
* master process for the entire job.
*
* @param jobContext Context of the job whose output is being written.
* @param state final runstate of the job
@ -106,7 +113,8 @@ public abstract class OutputCommitter {
}
/**
* Sets up output for the task.
* Sets up output for the task. This is called from each individual task's
* process that will output to HDFS, and it is called just for that task.
*
* @param taskContext Context of the task whose output is being written.
* @throws IOException
@ -115,7 +123,9 @@ public abstract class OutputCommitter {
throws IOException;
/**
* Check whether task needs a commit
* Check whether task needs a commit. This is called from each individual
* task's process that will output to HDFS, and it is called just for that
* task.
*
* @param taskContext
* @return true/false
@ -125,18 +135,23 @@ public abstract class OutputCommitter {
throws IOException;
/**
* To promote the task's temporary output to final output location
*
* The task's output is moved to the job's output directory.
* To promote the task's temporary output to final output location.
* If {@link #needsTaskCommit(TaskAttemptContext)} returns true and this
* task is the task that the AM determines finished first, this method
* is called to commit an individual task's output. This is to mark
* that tasks output as complete, as {@link #commitJob(JobContext)} will
* also be called later on if the entire job finished successfully. This
* is called from a task's process.
*
* @param taskContext Context of the task whose output is being written.
* @throws IOException if commit is not
* @throws IOException if commit is not successful.
*/
public abstract void commitTask(TaskAttemptContext taskContext)
throws IOException;
/**
* Discard the task output
* Discard the task output. This is called from a task's process to clean
* up a single task's output that can not yet been committed.
*
* @param taskContext
* @throws IOException
@ -164,7 +179,8 @@ public abstract class OutputCommitter {
* The retry-count for the job will be passed via the
* {@link MRJobConfig#APPLICATION_ATTEMPT_ID} key in
* {@link TaskAttemptContext#getConfiguration()} for the
* <code>OutputCommitter</code>.
* <code>OutputCommitter</code>. This is called from the application master
* process, but it is called individually for each task.
*
* If an exception is thrown the task will be attempted again.
*

556
hadoop-mapreduce-project/hadoop-mapreduce-client/hadoop-mapreduce-client-core/src/main/java/org/apache/hadoop/mapreduce/lib/output/FileOutputCommitter.java
View File

@ -19,16 +19,16 @@
package org.apache.hadoop.mapreduce.lib.output;
import java.io.IOException;
import java.net.URI;
import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;
import org.apache.hadoop.classification.InterfaceAudience;
import org.apache.hadoop.classification.InterfaceAudience.Private;
import org.apache.hadoop.classification.InterfaceStability;
import org.apache.hadoop.conf.Configuration;
import org.apache.hadoop.fs.FileStatus;
import org.apache.hadoop.fs.FileSystem;
import org.apache.hadoop.fs.Path;
import org.apache.hadoop.fs.PathFilter;
import org.apache.hadoop.mapreduce.JobContext;
import org.apache.hadoop.mapreduce.JobStatus;
import org.apache.hadoop.mapreduce.MRJobConfig;
@ -42,137 +42,323 @@ import org.apache.hadoop.mapreduce.TaskAttemptID;
@InterfaceAudience.Public
@InterfaceStability.Stable
public class FileOutputCommitter extends OutputCommitter {
private static final Log LOG = LogFactory.getLog(FileOutputCommitter.class);
/**
* Temporary directory name
* Name of directory where pending data is placed. Data that has not been
* committed yet.
*/
protected static final String TEMP_DIR_NAME = "_temporary";
public static final String PENDING_DIR_NAME = "_temporary";
public static final String SUCCEEDED_FILE_NAME = "_SUCCESS";
static final String SUCCESSFUL_JOB_OUTPUT_DIR_MARKER =
public static final String SUCCESSFUL_JOB_OUTPUT_DIR_MARKER =
"mapreduce.fileoutputcommitter.marksuccessfuljobs";
private FileSystem outputFileSystem = null;
private Path outputPath = null;
private Path workPath = null;
/**
* Create a file output committer
* @param outputPath the job's output path
* @param outputPath the job's output path, or null if you want the output
* committer to act as a noop.
* @param context the task's context
* @throws IOException
*/
public FileOutputCommitter(Path outputPath,
TaskAttemptContext context) throws IOException {
this(outputPath, (JobContext)context);
if (outputPath != null) {
this.outputPath = outputPath;
outputFileSystem = outputPath.getFileSystem(context.getConfiguration());
workPath = new Path(outputPath,
getTaskAttemptBaseDirName(context))
.makeQualified(outputFileSystem);
workPath = getTaskAttemptPath(context, outputPath);
}
}
/**
* Create a file output committer
* @param outputPath the job's output path, or null if you want the output
* committer to act as a noop.
* @param context the task's context
* @throws IOException
*/
@Private
public FileOutputCommitter(Path outputPath,
JobContext context) throws IOException {
if (outputPath != null) {
FileSystem fs = outputPath.getFileSystem(context.getConfiguration());
this.outputPath = fs.makeQualified(outputPath);
}
}
/**
* @return the path where final output of the job should be placed. This
* could also be considered the committed application attempt path.
*/
private Path getOutputPath() {
return this.outputPath;
}
/**
* @return true if we have an output path set, else false.
*/
private boolean hasOutputPath() {
return this.outputPath != null;
}
/**
* @return the path where the output of pending job attempts are
* stored.
*/
private Path getPendingJobAttemptsPath() {
return getPendingJobAttemptsPath(getOutputPath());
}
/**
* Get the location of pending job attempts.
* @param out the base output directory.
* @return the location of pending job attempts.
*/
private static Path getPendingJobAttemptsPath(Path out) {
return new Path(out, PENDING_DIR_NAME);
}
/**
* Get the Application Attempt Id for this job
* @param context the context to look in
* @return the Application Attempt Id for a given job.
*/
private static int getAppAttemptId(JobContext context) {
return context.getConfiguration().getInt(
MRJobConfig.APPLICATION_ATTEMPT_ID, 0);
}
/**
* Compute the path where the output of a given job attempt will be placed.
* @param context the context of the job. This is used to get the
* application attempt id.
* @return the path to store job attempt data.
*/
public Path getJobAttemptPath(JobContext context) {
return getJobAttemptPath(context, getOutputPath());
}
/**
* Compute the path where the output of a given job attempt will be placed.
* @param context the context of the job. This is used to get the
* application attempt id.
* @param out the output path to place these in.
* @return the path to store job attempt data.
*/
public static Path getJobAttemptPath(JobContext context, Path out) {
return getJobAttemptPath(getAppAttemptId(context), out);
}
/**
* Compute the path where the output of a given job attempt will be placed.
* @param appAttemptId the ID of the application attempt for this job.
* @return the path to store job attempt data.
*/
private Path getJobAttemptPath(int appAttemptId) {
return getJobAttemptPath(appAttemptId, getOutputPath());
}
/**
* Compute the path where the output of a given job attempt will be placed.
* @param appAttemptId the ID of the application attempt for this job.
* @return the path to store job attempt data.
*/
private static Path getJobAttemptPath(int appAttemptId, Path out) {
return new Path(getPendingJobAttemptsPath(out), String.valueOf(appAttemptId));
}
/**
* Compute the path where the output of pending task attempts are stored.
* @param context the context of the job with pending tasks.
* @return the path where the output of pending task attempts are stored.
*/
private Path getPendingTaskAttemptsPath(JobContext context) {
return getPendingTaskAttemptsPath(context, getOutputPath());
}
/**
* Compute the path where the output of pending task attempts are stored.
* @param context the context of the job with pending tasks.
* @return the path where the output of pending task attempts are stored.
*/
private static Path getPendingTaskAttemptsPath(JobContext context, Path out) {
return new Path(getJobAttemptPath(context, out), PENDING_DIR_NAME);
}
/**
* Compute the path where the output of a task attempt is stored until
* that task is committed.
*
* @param context the context of the task attempt.
* @return the path where a task attempt should be stored.
*/
public Path getTaskAttemptPath(TaskAttemptContext context) {
return new Path(getPendingTaskAttemptsPath(context),
String.valueOf(context.getTaskAttemptID()));
}
/**
* Compute the path where the output of a task attempt is stored until
* that task is committed.
*
* @param context the context of the task attempt.
* @param out The output path to put things in.
* @return the path where a task attempt should be stored.
*/
public static Path getTaskAttemptPath(TaskAttemptContext context, Path out) {
return new Path(getPendingTaskAttemptsPath(context, out),
String.valueOf(context.getTaskAttemptID()));
}
/**
* Compute the path where the output of a committed task is stored until
* the entire job is committed.
* @param context the context of the task attempt
* @return the path where the output of a committed task is stored until
* the entire job is committed.
*/
public Path getCommittedTaskPath(TaskAttemptContext context) {
return getCommittedTaskPath(getAppAttemptId(context), context);
}
public static Path getCommittedTaskPath(TaskAttemptContext context, Path out) {
return getCommittedTaskPath(getAppAttemptId(context), context, out);
}
/**
* Compute the path where the output of a committed task is stored until the
* entire job is committed for a specific application attempt.
* @param appAttemptId the id of the application attempt to use
* @param context the context of any task.
* @return the path where the output of a committed task is stored.
*/
private Path getCommittedTaskPath(int appAttemptId, TaskAttemptContext context) {
return new Path(getJobAttemptPath(appAttemptId),
String.valueOf(context.getTaskAttemptID().getTaskID()));
}
private static Path getCommittedTaskPath(int appAttemptId, TaskAttemptContext context, Path out) {
return new Path(getJobAttemptPath(appAttemptId, out),
String.valueOf(context.getTaskAttemptID().getTaskID()));
}
private static class CommittedTaskFilter implements PathFilter {
@Override
public boolean accept(Path path) {
return !PENDING_DIR_NAME.equals(path.getName());
}
}
/**
* Get a list of all paths where output from committed tasks are stored.
* @param context the context of the current job
* @return the list of these Paths/FileStatuses.
* @throws IOException
*/
private FileStatus[] getAllCommittedTaskPaths(JobContext context)
throws IOException {
Path jobAttemptPath = getJobAttemptPath(context);
FileSystem fs = jobAttemptPath.getFileSystem(context.getConfiguration());
return fs.listStatus(jobAttemptPath, new CommittedTaskFilter());
}
/**
* Get the directory that the task should write results into.
* @return the work directory
* @throws IOException
*/
public Path getWorkPath() throws IOException {
return workPath;
}
/**
* Create the temporary directory that is the root of all of the task
* work directories.
* @param context the job's context
*/
public void setupJob(JobContext context) throws IOException {
if (outputPath != null) {
Path tmpDir = new Path(outputPath, getJobAttemptBaseDirName(context) +
Path.SEPARATOR + FileOutputCommitter.TEMP_DIR_NAME);
FileSystem fileSys = tmpDir.getFileSystem(context.getConfiguration());
if (!fileSys.mkdirs(tmpDir)) {
LOG.error("Mkdirs failed to create " + tmpDir.toString());
if (hasOutputPath()) {
Path pendingJobAttemptsPath = getPendingJobAttemptsPath();
FileSystem fs = pendingJobAttemptsPath.getFileSystem(
context.getConfiguration());
if (!fs.mkdirs(pendingJobAttemptsPath)) {
LOG.error("Mkdirs failed to create " + pendingJobAttemptsPath);
}
}
}
// True if the job requires output.dir marked on successful job.
// Note that by default it is set to true.
private boolean shouldMarkOutputDir(Configuration conf) {
return conf.getBoolean(SUCCESSFUL_JOB_OUTPUT_DIR_MARKER, true);
}
// Create a _success file in the job's output dir
private void markOutputDirSuccessful(MRJobConfig context) throws IOException {
if (outputPath != null) {
// create a file in the output folder to mark the job completion
Path filePath = new Path(outputPath, SUCCEEDED_FILE_NAME);
outputFileSystem.create(filePath).close();
} else {
LOG.warn("Output Path is null in setupJob()");
}
}
/**
* Move all job output to the final place.
* The job has completed so move all committed tasks to the final output dir.
* Delete the temporary directory, including all of the work directories.
* Create a _SUCCESS file to make it as successful.
* @param context the job's context
*/
public void commitJob(JobContext context) throws IOException {
if (outputPath != null) {
//delete the task temp directory from the current jobtempdir
Path tmpDir = new Path(outputPath, getJobAttemptBaseDirName(context) +
Path.SEPARATOR + FileOutputCommitter.TEMP_DIR_NAME);
FileSystem fileSys = tmpDir.getFileSystem(context.getConfiguration());
if (fileSys.exists(tmpDir)) {
fileSys.delete(tmpDir, true);
} else {
LOG.warn("Task temp dir could not be deleted " + tmpDir);
if (hasOutputPath()) {
Path finalOutput = getOutputPath();
FileSystem fs = finalOutput.getFileSystem(context.getConfiguration());
for(FileStatus stat: getAllCommittedTaskPaths(context)) {
mergePaths(fs, stat, finalOutput);
}
//move the job output to final place
Path jobOutputPath =
new Path(outputPath, getJobAttemptBaseDirName(context));
moveJobOutputs(outputFileSystem, jobOutputPath, outputPath, jobOutputPath);
// delete the _temporary folder and create a _done file in the o/p folder
cleanupJob(context);
if (shouldMarkOutputDir(context.getConfiguration())) {
markOutputDirSuccessful(context);
// True if the job requires output.dir marked on successful job.
// Note that by default it is set to true.
if (context.getConfiguration().getBoolean(SUCCESSFUL_JOB_OUTPUT_DIR_MARKER, true)) {
Path markerPath = new Path(outputPath, SUCCEEDED_FILE_NAME);
fs.create(markerPath).close();
}
} else {
LOG.warn("Output Path is null in commitJob()");
}
}
/**
* Move job output to final location
* @param fs Filesystem handle
* @param origJobOutputPath The original location of the job output
* Required to generate the relative path for correct moving of data.
* @param finalOutputDir The final output directory to which the job output
* needs to be moved
* @param jobOutput The current job output directory being moved
* @throws IOException
* Merge two paths together. Anything in from will be moved into to, if there
* are any name conflicts while merging the files or directories in from win.
* @param fs the File System to use
* @param from the path data is coming from.
* @param to the path data is going to.
* @throws IOException on any error
*/
private void moveJobOutputs(FileSystem fs, final Path origJobOutputPath,
Path finalOutputDir, Path jobOutput) throws IOException {
LOG.debug("Told to move job output from " + jobOutput
+ " to " + finalOutputDir +
" and orig job output path is " + origJobOutputPath);
if (fs.isFile(jobOutput)) {
Path finalOutputPath =
getFinalPath(finalOutputDir, jobOutput, origJobOutputPath);
if (!fs.rename(jobOutput, finalOutputPath)) {
if (!fs.delete(finalOutputPath, true)) {
throw new IOException("Failed to delete earlier output of job");
}
if (!fs.rename(jobOutput, finalOutputPath)) {
throw new IOException("Failed to save output of job");
private static void mergePaths(FileSystem fs, final FileStatus from,
final Path to)
throws IOException {
LOG.debug("Merging data from "+from+" to "+to);
if(from.isFile()) {
if(fs.exists(to)) {
if(!fs.delete(to, true)) {
throw new IOException("Failed to delete "+to);
}
}
LOG.debug("Moved job output file from " + jobOutput + " to " +
finalOutputPath);
} else if (fs.getFileStatus(jobOutput).isDirectory()) {
LOG.debug("Job output file " + jobOutput + " is a dir");
FileStatus[] paths = fs.listStatus(jobOutput);
Path finalOutputPath =
getFinalPath(finalOutputDir, jobOutput, origJobOutputPath);
fs.mkdirs(finalOutputPath);
LOG.debug("Creating dirs along job output path " + finalOutputPath);
if (paths != null) {
for (FileStatus path : paths) {
moveJobOutputs(fs, origJobOutputPath, finalOutputDir, path.getPath());
if(!fs.rename(from.getPath(), to)) {
throw new IOException("Failed to rename "+from+" to "+to);
}
} else if(from.isDirectory()) {
if(fs.exists(to)) {
FileStatus toStat = fs.getFileStatus(to);
if(!toStat.isDirectory()) {
if(!fs.delete(to, true)) {
throw new IOException("Failed to delete "+to);
}
if(!fs.rename(from.getPath(), to)) {
throw new IOException("Failed to rename "+from+" to "+to);
}
} else {
//It is a directory so merge everything in the directories
for(FileStatus subFrom: fs.listStatus(from.getPath())) {
Path subTo = new Path(to, subFrom.getPath().getName());
mergePaths(fs, subFrom, subTo);
}
}
} else {
//it does not exist just rename
if(!fs.rename(from.getPath(), to)) {
throw new IOException("Failed to rename "+from+" to "+to);
}
}
}
@ -181,14 +367,13 @@ public class FileOutputCommitter extends OutputCommitter {
@Override
@Deprecated
public void cleanupJob(JobContext context) throws IOException {
if (outputPath != null) {
Path tmpDir = new Path(outputPath, FileOutputCommitter.TEMP_DIR_NAME);
FileSystem fileSys = tmpDir.getFileSystem(context.getConfiguration());
if (fileSys.exists(tmpDir)) {
fileSys.delete(tmpDir, true);
}
if (hasOutputPath()) {
Path pendingJobAttemptsPath = getPendingJobAttemptsPath();
FileSystem fs = pendingJobAttemptsPath
.getFileSystem(context.getConfiguration());
fs.delete(pendingJobAttemptsPath, true);
} else {
LOG.warn("Output Path is null in cleanup");
LOG.warn("Output Path is null in cleanupJob()");
}
}
@ -217,69 +402,40 @@ public class FileOutputCommitter extends OutputCommitter {
* Move the files from the work directory to the job output directory
* @param context the task context
*/
@Override
public void commitTask(TaskAttemptContext context)
throws IOException {
TaskAttemptID attemptId = context.getTaskAttemptID();
if (workPath != null) {
context.progress();
if (outputFileSystem.exists(workPath)) {
// Move the task outputs to the current job attempt output dir
Path jobOutputPath =
new Path(outputPath, getJobAttemptBaseDirName(context));
moveTaskOutputs(context, outputFileSystem, jobOutputPath, workPath);
// Delete the temporary task-specific output directory
if (!outputFileSystem.delete(workPath, true)) {
LOG.warn("Failed to delete the temporary output" +
" directory of task: " + attemptId + " - " + workPath);
}
LOG.info("Saved output of task '" + attemptId + "' to " +
jobOutputPath);
}
}
commitTask(context, null);
}
/**
* Move all of the files from the work directory to the final output
* @param context the task context
* @param fs the output file system
* @param jobOutputDir the final output direcotry
* @param taskOutput the work path
* @throws IOException
*/
private void moveTaskOutputs(TaskAttemptContext context,
FileSystem fs,
Path jobOutputDir,
Path taskOutput)
@Private
public void commitTask(TaskAttemptContext context, Path taskAttemptPath)
throws IOException {
TaskAttemptID attemptId = context.getTaskAttemptID();
if (hasOutputPath()) {
context.progress();
LOG.debug("Told to move taskoutput from " + taskOutput
+ " to " + jobOutputDir);
if (fs.isFile(taskOutput)) {
Path finalOutputPath = getFinalPath(jobOutputDir, taskOutput,
workPath);
if (!fs.rename(taskOutput, finalOutputPath)) {
if (!fs.delete(finalOutputPath, true)) {
throw new IOException("Failed to delete earlier output of task: " +
attemptId);
if(taskAttemptPath == null) {
taskAttemptPath = getTaskAttemptPath(context);
}
if (!fs.rename(taskOutput, finalOutputPath)) {
throw new IOException("Failed to save output of task: " +
attemptId);
Path committedTaskPath = getCommittedTaskPath(context);
FileSystem fs = taskAttemptPath.getFileSystem(context.getConfiguration());
if (fs.exists(taskAttemptPath)) {
if(fs.exists(committedTaskPath)) {
if(!fs.delete(committedTaskPath, true)) {
throw new IOException("Could not delete " + committedTaskPath);
}
}
LOG.debug("Moved " + taskOutput + " to " + finalOutputPath);
} else if(fs.getFileStatus(taskOutput).isDirectory()) {
LOG.debug("Taskoutput " + taskOutput + " is a dir");
FileStatus[] paths = fs.listStatus(taskOutput);
Path finalOutputPath = getFinalPath(jobOutputDir, taskOutput, workPath);
fs.mkdirs(finalOutputPath);
LOG.debug("Creating dirs along path " + finalOutputPath);
if (paths != null) {
for (FileStatus path : paths) {
moveTaskOutputs(context, fs, jobOutputDir, path.getPath());
if(!fs.rename(taskAttemptPath, committedTaskPath)) {
throw new IOException("Could not rename " + taskAttemptPath + " to "
+ committedTaskPath);
}
LOG.info("Saved output of task '" + attemptId + "' to " +
committedTaskPath);
} else {
LOG.warn("No Output found for " + attemptId);
}
} else {
LOG.warn("Output Path is null in commitTask()");
}
}
@ -289,38 +445,22 @@ public class FileOutputCommitter extends OutputCommitter {
*/
@Override
public void abortTask(TaskAttemptContext context) throws IOException {
if (workPath != null) {
context.progress();
outputFileSystem.delete(workPath, true);
}
abortTask(context, null);
}
/**
* Find the final name of a given output file, given the job output directory
* and the work directory.
* @param jobOutputDir the job's output directory
* @param taskOutput the specific task output file
* @param taskOutputPath the job's work directory
* @return the final path for the specific output file
* @throws IOException
*/
private Path getFinalPath(Path jobOutputDir, Path taskOutput,
Path taskOutputPath) throws IOException {
URI taskOutputUri = taskOutput.makeQualified(outputFileSystem.getUri(),
outputFileSystem.getWorkingDirectory()).toUri();
URI taskOutputPathUri =
taskOutputPath.makeQualified(
outputFileSystem.getUri(),
outputFileSystem.getWorkingDirectory()).toUri();
URI relativePath = taskOutputPathUri.relativize(taskOutputUri);
if (taskOutputUri == relativePath) {
throw new IOException("Can not get the relative path: base = " +
taskOutputPathUri + " child = " + taskOutputUri);
@Private
public void abortTask(TaskAttemptContext context, Path taskAttemptPath) throws IOException {
if (hasOutputPath()) {
context.progress();
if(taskAttemptPath == null) {
taskAttemptPath = getTaskAttemptPath(context);
}
FileSystem fs = taskAttemptPath.getFileSystem(context.getConfiguration());
if(!fs.delete(taskAttemptPath, true)) {
LOG.warn("Could not delete "+taskAttemptPath);
}
if (relativePath.getPath().length() > 0) {
return new Path(jobOutputDir, relativePath.getPath());
} else {
return jobOutputDir;
LOG.warn("Output Path is null in abortTask()");
}
}
@ -331,16 +471,20 @@ public class FileOutputCommitter extends OutputCommitter {
@Override
public boolean needsTaskCommit(TaskAttemptContext context
) throws IOException {
return workPath != null && outputFileSystem.exists(workPath);
return needsTaskCommit(context, null);
}
/**
* Get the directory that the task should write results into
* @return the work directory
* @throws IOException
*/
public Path getWorkPath() throws IOException {
return workPath;
@Private
public boolean needsTaskCommit(TaskAttemptContext context, Path taskAttemptPath
) throws IOException {
if(hasOutputPath()) {
if(taskAttemptPath == null) {
taskAttemptPath = getTaskAttemptPath(context);
}
FileSystem fs = taskAttemptPath.getFileSystem(context.getConfiguration());
return fs.exists(taskAttemptPath);
}
return false;
}
@Override
@ -352,43 +496,35 @@ public class FileOutputCommitter extends OutputCommitter {
public void recoverTask(TaskAttemptContext context)
throws IOException {
context.progress();
Path jobOutputPath =
new Path(outputPath, getJobAttemptBaseDirName(context));
int previousAttempt =
context.getConfiguration().getInt(
MRJobConfig.APPLICATION_ATTEMPT_ID, 0) - 1;
TaskAttemptID attemptId = context.getTaskAttemptID();
int previousAttempt = getAppAttemptId(context) - 1;
if (previousAttempt < 0) {
throw new IOException ("Cannot recover task output for first attempt...");
}
Path pathToRecover =
new Path(outputPath, getJobAttemptBaseDirName(previousAttempt));
LOG.debug("Trying to recover task from " + pathToRecover
+ " into " + jobOutputPath);
if (outputFileSystem.exists(pathToRecover)) {
// Move the task outputs to their final place
moveJobOutputs(outputFileSystem,
pathToRecover, jobOutputPath, pathToRecover);
LOG.info("Saved output of job to " + jobOutputPath);
}
}
Path committedTaskPath = getCommittedTaskPath(context);
Path previousCommittedTaskPath = getCommittedTaskPath(
previousAttempt, context);
FileSystem fs = committedTaskPath.getFileSystem(context.getConfiguration());
protected static String getJobAttemptBaseDirName(JobContext context) {
int appAttemptId =
context.getConfiguration().getInt(
MRJobConfig.APPLICATION_ATTEMPT_ID, 0);
return getJobAttemptBaseDirName(appAttemptId);
LOG.debug("Trying to recover task from " + previousCommittedTaskPath
+ " into " + committedTaskPath);
if (fs.exists(previousCommittedTaskPath)) {
if(fs.exists(committedTaskPath)) {
if(!fs.delete(committedTaskPath, true)) {
throw new IOException("Could not delete "+committedTaskPath);
}
protected static String getJobAttemptBaseDirName(int appAttemptId) {
return FileOutputCommitter.TEMP_DIR_NAME + Path.SEPARATOR +
+ appAttemptId;
}
protected static String getTaskAttemptBaseDirName(
TaskAttemptContext context) {
return getJobAttemptBaseDirName(context) + Path.SEPARATOR +
FileOutputCommitter.TEMP_DIR_NAME + Path.SEPARATOR +
"_" + context.getTaskAttemptID().toString();
//Rename can fail if the parent directory does not yet exist.
Path committedParent = committedTaskPath.getParent();
fs.mkdirs(committedParent);
if(!fs.rename(previousCommittedTaskPath, committedTaskPath)) {
throw new IOException("Could not rename " + previousCommittedTaskPath +
" to " + committedTaskPath);
}
LOG.info("Saved output of " + attemptId + " to " + committedTaskPath);
} else {
LOG.warn(attemptId+" had no output to recover.");
}
}
}

38
hadoop-mapreduce-project/hadoop-mapreduce-client/hadoop-mapreduce-client-core/src/test/java/org/apache/hadoop/mapred/TestFileOutputCommitter.java
View File

@ -105,10 +105,9 @@ public class TestFileOutputCommitter extends TestCase {
// do commit
committer.commitTask(tContext);
Path jobTempDir1 = new Path(outDir,
FileOutputCommitter.getJobAttemptBaseDirName(
conf.getInt(MRConstants.APPLICATION_ATTEMPT_ID, 0)));
assertTrue((new File(jobTempDir1.toString()).exists()));
Path jobTempDir1 = committer.getCommittedTaskPath(tContext);
File jtd1 = new File(jobTempDir1.toUri().getPath());
assertTrue(jtd1.exists());
validateContent(jobTempDir1);
//now while running the second app attempt,
@ -119,14 +118,12 @@ public class TestFileOutputCommitter extends TestCase {
JobContext jContext2 = new JobContextImpl(conf2, taskID.getJobID());
TaskAttemptContext tContext2 = new TaskAttemptContextImpl(conf2, taskID);
FileOutputCommitter committer2 = new FileOutputCommitter();
committer.setupJob(jContext2);
Path jobTempDir2 = new Path(outDir,
FileOutputCommitter.getJobAttemptBaseDirName(
conf2.getInt(MRConstants.APPLICATION_ATTEMPT_ID, 0)));
assertTrue((new File(jobTempDir2.toString()).exists()));
committer2.setupJob(jContext2);
Path jobTempDir2 = committer2.getCommittedTaskPath(tContext2);
tContext2.getConfiguration().setInt(MRConstants.APPLICATION_ATTEMPT_ID, 2);
committer2.recoverTask(tContext2);
File jtd2 = new File(jobTempDir2.toUri().getPath());
assertTrue(jtd2.exists());
validateContent(jobTempDir2);
committer2.commitJob(jContext2);
@ -135,7 +132,8 @@ public class TestFileOutputCommitter extends TestCase {
}
private void validateContent(Path dir) throws IOException {
File expectedFile = new File(new Path(dir, partFile).toString());
File fdir = new File(dir.toUri().getPath());
File expectedFile = new File(fdir, partFile);
StringBuffer expectedOutput = new StringBuffer();
expectedOutput.append(key1).append('\t').append(val1).append("\n");
expectedOutput.append(val1).append("\n");
@ -244,21 +242,17 @@ public class TestFileOutputCommitter extends TestCase {
// do abort
committer.abortTask(tContext);
FileSystem outputFileSystem = outDir.getFileSystem(conf);
Path workPath = new Path(outDir,
committer.getTaskAttemptBaseDirName(tContext))
.makeQualified(outputFileSystem);
File expectedFile = new File(new Path(workPath, partFile)
.toString());
File out = new File(outDir.toUri().getPath());
Path workPath = committer.getWorkPath(tContext, outDir);
File wp = new File(workPath.toUri().getPath());
File expectedFile = new File(wp, partFile);
assertFalse("task temp dir still exists", expectedFile.exists());
committer.abortJob(jContext, JobStatus.State.FAILED);
expectedFile = new File(new Path(outDir, FileOutputCommitter.TEMP_DIR_NAME)
.toString());
expectedFile = new File(out, FileOutputCommitter.TEMP_DIR_NAME);
assertFalse("job temp dir still exists", expectedFile.exists());
assertEquals("Output directory not empty", 0, new File(outDir.toString())
.listFiles().length);
FileUtil.fullyDelete(new File(outDir.toString()));
assertEquals("Output directory not empty", 0, out.listFiles().length);
FileUtil.fullyDelete(out);
}
public static class FakeFileSystem extends RawLocalFileSystem {

56
hadoop-mapreduce-project/hadoop-mapreduce-client/hadoop-mapreduce-client-core/src/test/java/org/apache/hadoop/mapreduce/lib/output/TestFileOutputCommitter.java
View File

@ -60,6 +60,22 @@ public class TestFileOutputCommitter extends TestCase {
private Text val2 = new Text("val2");
private static void cleanup() throws IOException {
Configuration conf = new Configuration();
FileSystem fs = outDir.getFileSystem(conf);
fs.delete(outDir, true);
}
@Override
public void setUp() throws IOException {
cleanup();
}
@Override
public void tearDown() throws IOException {
cleanup();
}
private void writeOutput(RecordWriter theRecordWriter,
TaskAttemptContext context) throws IOException, InterruptedException {
NullWritable nullWritable = NullWritable.get();
@ -114,11 +130,10 @@ public class TestFileOutputCommitter extends TestCase {
// do commit
committer.commitTask(tContext);
Path jobTempDir1 = new Path(outDir,
FileOutputCommitter.getJobAttemptBaseDirName(
conf.getInt(MRJobConfig.APPLICATION_ATTEMPT_ID, 0)));
assertTrue((new File(jobTempDir1.toString()).exists()));
validateContent(jobTempDir1);
Path jobTempDir1 = committer.getCommittedTaskPath(tContext);
File jtd = new File(jobTempDir1.toUri().getPath());
assertTrue(jtd.exists());
validateContent(jtd);
//now while running the second app attempt,
//recover the task output from first attempt
@ -128,15 +143,13 @@ public class TestFileOutputCommitter extends TestCase {
JobContext jContext2 = new JobContextImpl(conf2, taskID.getJobID());
TaskAttemptContext tContext2 = new TaskAttemptContextImpl(conf2, taskID);
FileOutputCommitter committer2 = new FileOutputCommitter(outDir, tContext2);
committer.setupJob(tContext2);
Path jobTempDir2 = new Path(outDir,
FileOutputCommitter.getJobAttemptBaseDirName(
conf2.getInt(MRJobConfig.APPLICATION_ATTEMPT_ID, 0)));
assertTrue((new File(jobTempDir2.toString()).exists()));
committer2.setupJob(tContext2);
Path jobTempDir2 = committer2.getCommittedTaskPath(tContext2);
File jtd2 = new File(jobTempDir2.toUri().getPath());
tContext2.getConfiguration().setInt(MRJobConfig.APPLICATION_ATTEMPT_ID, 2);
committer2.recoverTask(tContext2);
validateContent(jobTempDir2);
assertTrue(jtd2.exists());
validateContent(jtd2);
committer2.commitJob(jContext2);
validateContent(outDir);
@ -144,7 +157,12 @@ public class TestFileOutputCommitter extends TestCase {
}
private void validateContent(Path dir) throws IOException {
File expectedFile = new File(new Path(dir, partFile).toString());
validateContent(new File(dir.toUri().getPath()));
}
private void validateContent(File dir) throws IOException {
File expectedFile = new File(dir, partFile);
assertTrue("Could not find "+expectedFile, expectedFile.exists());
StringBuffer expectedOutput = new StringBuffer();
expectedOutput.append(key1).append('\t').append(val1).append("\n");
expectedOutput.append(val1).append("\n");
@ -259,7 +277,7 @@ public class TestFileOutputCommitter extends TestCase {
assertFalse("task temp dir still exists", expectedFile.exists());
committer.abortJob(jContext, JobStatus.State.FAILED);
expectedFile = new File(new Path(outDir, FileOutputCommitter.TEMP_DIR_NAME)
expectedFile = new File(new Path(outDir, FileOutputCommitter.PENDING_DIR_NAME)
.toString());
assertFalse("job temp dir still exists", expectedFile.exists());
assertEquals("Output directory not empty", 0, new File(outDir.toString())
@ -315,12 +333,10 @@ public class TestFileOutputCommitter extends TestCase {
assertNotNull(th);
assertTrue(th instanceof IOException);
assertTrue(th.getMessage().contains("fake delete failed"));
File jobTmpDir = new File(new Path(outDir,
FileOutputCommitter.TEMP_DIR_NAME + Path.SEPARATOR +
conf.getInt(MRJobConfig.APPLICATION_ATTEMPT_ID, 0) +
Path.SEPARATOR +
FileOutputCommitter.TEMP_DIR_NAME).toString());
File taskTmpDir = new File(jobTmpDir, "_" + taskID);
Path jtd = committer.getJobAttemptPath(jContext);
File jobTmpDir = new File(jtd.toUri().getPath());
Path ttd = committer.getTaskAttemptPath(tContext);
File taskTmpDir = new File(ttd.toUri().getPath());
File expectedFile = new File(taskTmpDir, partFile);
assertTrue(expectedFile + " does not exists", expectedFile.exists());

15
hadoop-mapreduce-project/hadoop-mapreduce-client/hadoop-mapreduce-client-jobclient/src/test/java/org/apache/hadoop/mapred/TestFileOutputCommitter.java
View File

@ -74,7 +74,7 @@ public class TestFileOutputCommitter extends TestCase {
TaskAttemptContext tContext = new TaskAttemptContextImpl(job, taskID);
FileOutputCommitter committer = new FileOutputCommitter();
FileOutputFormat.setWorkOutputPath(job,
committer.getTempTaskOutputPath(tContext));
committer.getTaskAttemptPath(tContext));
committer.setupJob(jContext);
committer.setupTask(tContext);
@ -115,7 +115,7 @@ public class TestFileOutputCommitter extends TestCase {
TaskAttemptContext tContext = new TaskAttemptContextImpl(job, taskID);
FileOutputCommitter committer = new FileOutputCommitter();
FileOutputFormat.setWorkOutputPath(job, committer
.getTempTaskOutputPath(tContext));
.getTaskAttemptPath(tContext));
// do setup
committer.setupJob(jContext);
@ -134,13 +134,13 @@ public class TestFileOutputCommitter extends TestCase {
// do abort
committer.abortTask(tContext);
File expectedFile = new File(new Path(committer
.getTempTaskOutputPath(tContext), file).toString());
.getTaskAttemptPath(tContext), file).toString());
assertFalse("task temp dir still exists", expectedFile.exists());
committer.abortJob(jContext, JobStatus.State.FAILED);
expectedFile = new File(new Path(outDir, FileOutputCommitter.TEMP_DIR_NAME)
.toString());
assertFalse("job temp dir still exists", expectedFile.exists());
assertFalse("job temp dir "+expectedFile+" still exists", expectedFile.exists());
assertEquals("Output directory not empty", 0, new File(outDir.toString())
.listFiles().length);
FileUtil.fullyDelete(new File(outDir.toString()));
@ -170,16 +170,15 @@ public class TestFileOutputCommitter extends TestCase {
TaskAttemptContext tContext = new TaskAttemptContextImpl(job, taskID);
FileOutputCommitter committer = new FileOutputCommitter();
FileOutputFormat.setWorkOutputPath(job, committer
.getTempTaskOutputPath(tContext));
.getTaskAttemptPath(tContext));
// do setup
committer.setupJob(jContext);
committer.setupTask(tContext);
String file = "test.txt";
String taskBaseDirName = committer.getTaskAttemptBaseDirName(tContext);
File jobTmpDir = new File(outDir.toString(), committer.getJobAttemptBaseDirName(jContext));
File taskTmpDir = new File(outDir.toString(), taskBaseDirName);
File jobTmpDir = new File(committer.getJobAttemptPath(jContext).toUri().getPath());
File taskTmpDir = new File(committer.getTaskAttemptPath(tContext).toUri().getPath());
File expectedFile = new File(taskTmpDir, file);
// A reporter that does nothing

2
hadoop-mapreduce-project/hadoop-mapreduce-client/hadoop-mapreduce-client-jobclient/src/test/java/org/apache/hadoop/mapred/TestTaskCommit.java
View File

@ -34,7 +34,7 @@ public class TestTaskCommit extends HadoopTestCase {
static class CommitterWithCommitFail extends FileOutputCommitter {
public void commitTask(TaskAttemptContext context) throws IOException {
Path taskOutputPath = getTempTaskOutputPath(context);
Path taskOutputPath = getTaskAttemptPath(context);
TaskAttemptID attemptId = context.getTaskAttemptID();
JobConf job = context.getJobConf();
if (taskOutputPath != null) {

24
hadoop-mapreduce-project/hadoop-mapreduce-client/hadoop-mapreduce-client-jobclient/src/test/java/org/apache/hadoop/mapreduce/lib/output/TestFileOutputCommitter.java
View File

@ -70,6 +70,22 @@ public class TestFileOutputCommitter extends TestCase {
}
}
private static void cleanup() throws IOException {
Configuration conf = new Configuration();
FileSystem fs = outDir.getFileSystem(conf);
fs.delete(outDir, true);
}
@Override
public void setUp() throws IOException {
cleanup();
}
@Override
public void tearDown() throws IOException {
cleanup();
}
@SuppressWarnings("unchecked")
public void testCommitter() throws Exception {
Job job = Job.getInstance();
@ -133,7 +149,7 @@ public class TestFileOutputCommitter extends TestCase {
assertFalse("task temp dir still exists", expectedFile.exists());
committer.abortJob(jContext, JobStatus.State.FAILED);
expectedFile = new File(new Path(outDir, FileOutputCommitter.TEMP_DIR_NAME)
expectedFile = new File(new Path(outDir, FileOutputCommitter.PENDING_DIR_NAME)
.toString());
assertFalse("job temp dir still exists", expectedFile.exists());
assertEquals("Output directory not empty", 0, new File(outDir.toString())
@ -188,9 +204,9 @@ public class TestFileOutputCommitter extends TestCase {
assertNotNull(th);
assertTrue(th instanceof IOException);
assertTrue(th.getMessage().contains("fake delete failed"));
String taskBaseDirName = committer.getTaskAttemptBaseDirName(tContext);
File jobTmpDir = new File(outDir.toString(), committer.getJobAttemptBaseDirName(jContext));
File taskTmpDir = new File(outDir.toString(), taskBaseDirName);
//Path taskBaseDirName = committer.getTaskAttemptBaseDirName(tContext);
File jobTmpDir = new File(committer.getJobAttemptPath(jContext).toUri().getPath());
File taskTmpDir = new File(committer.getTaskAttemptPath(tContext).toUri().getPath());
File expectedFile = new File(taskTmpDir, partFile);
assertTrue(expectedFile + " does not exists", expectedFile.exists());