package org.apache.blur.mapreduce.lib;
/**
* 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.
*/
import java.io.IOException;
import org.apache.blur.log.Log;
import org.apache.blur.log.LogFactory;
import org.apache.blur.thrift.generated.TableDescriptor;
import org.apache.blur.utils.BlurConstants;
import org.apache.blur.utils.BlurUtil;
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.State;
import org.apache.hadoop.mapreduce.OutputCommitter;
import org.apache.hadoop.mapreduce.TaskAttemptContext;
import org.apache.hadoop.mapreduce.TaskAttemptID;
import org.apache.hadoop.mapreduce.TaskType;
public class BlurOutputCommitter extends OutputCommitter {
private static final Log LOG = LogFactory.getLog(BlurOutputCommitter.class);
@Override
public void setupJob(JobContext jobContext) throws IOException {
LOG.info("Running setup job.");
}
@Override
public void commitJob(JobContext jobContext) throws IOException {
// look through all the shards for attempts that need to be cleaned up.
// also find all the attempts that are finished
// then rename all the attempts jobs to commits
LOG.info("Commiting Job [{0}]", jobContext.getJobID());
Configuration configuration = jobContext.getConfiguration();
Path tableOutput = BlurOutputFormat.getOutputPath(configuration);
LOG.info("TableOutput path [{0}]", tableOutput);
makeSureNoEmptyShards(configuration, tableOutput);
FileSystem fileSystem = tableOutput.getFileSystem(configuration);
for (FileStatus fileStatus : fileSystem.listStatus(tableOutput)) {
LOG.info("Checking file status [{0}] with path [{1}]", fileStatus, fileStatus.getPath());
if (isShard(fileStatus)) {
commitOrAbortJob(jobContext, fileStatus.getPath(), true);
}
}
LOG.info("Commiting Complete [{0}]", jobContext.getJobID());
}
private void makeSureNoEmptyShards(Configuration configuration, Path tableOutput) throws IOException {
FileSystem fileSystem = tableOutput.getFileSystem(configuration);
TableDescriptor tableDescriptor = BlurOutputFormat.getTableDescriptor(configuration);
int shardCount = tableDescriptor.getShardCount();
for (int i = 0; i < shardCount; i++) {
String shardName = BlurUtil.getShardName(i);
fileSystem.mkdirs(new Path(tableOutput, shardName));
}
}
private void commitOrAbortJob(JobContext jobContext, Path shardPath, boolean commit) throws IOException {
LOG.info("CommitOrAbort [{0}] path [{1}]", commit, shardPath);
FileSystem fileSystem = shardPath.getFileSystem(jobContext.getConfiguration());
FileStatus[] listStatus = fileSystem.listStatus(shardPath, new PathFilter() {
@Override
public boolean accept(Path path) {
LOG.info("Checking path [{0}]", path);
if (path.getName().endsWith(".task_complete")) {
return true;
}
return false;
}
});
for (FileStatus fileStatus : listStatus) {
Path path = fileStatus.getPath();
LOG.info("Trying to commitOrAbort [{0}]", path);
String name = path.getName();
boolean taskComplete = name.endsWith(".task_complete");
if (fileStatus.isDirectory()) {
String taskAttemptName = getTaskAttemptName(name);
if (taskAttemptName == null) {
LOG.info("Dir name [{0}] not task attempt", name);
continue;
}
TaskAttemptID taskAttemptID = TaskAttemptID.forName(taskAttemptName);
if (taskAttemptID.getJobID().equals(jobContext.getJobID())) {
if (commit) {
if (taskComplete) {
fileSystem.rename(path, new Path(shardPath, taskAttemptName + ".commit"));
LOG.info("Committing [{0}] in path [{1}]", taskAttemptID, path);
} else {
fileSystem.delete(path, true);
LOG.info("Deleteing tmp dir [{0}] in path [{1}]", taskAttemptID, path);
}
} else {
fileSystem.delete(path, true);
LOG.info("Deleteing aborted job dir [{0}] in path [{1}]", taskAttemptID, path);
}
} else {
LOG.warn("TaskAttempt JobID [{0}] does not match JobContext JobId [{1}]", taskAttemptID.getJobID(),
jobContext.getJobID());
}
}
}
}
private String getTaskAttemptName(String name) {
int lastIndexOf = name.lastIndexOf('.');
if (lastIndexOf < 0) {
return null;
}
return name.substring(0, lastIndexOf);
}
private boolean isShard(FileStatus fileStatus) {
return isShard(fileStatus.getPath());
}
private boolean isShard(Path path) {
return path.getName().startsWith(BlurConstants.SHARD_PREFIX);
}
@Override
public void abortJob(JobContext jobContext, State state) throws IOException {
LOG.info("Abort Job [{0}]", jobContext.getJobID());
Configuration configuration = jobContext.getConfiguration();
Path tableOutput = BlurOutputFormat.getOutputPath(configuration);
makeSureNoEmptyShards(configuration, tableOutput);
FileSystem fileSystem = tableOutput.getFileSystem(configuration);
for (FileStatus fileStatus : fileSystem.listStatus(tableOutput)) {
if (isShard(fileStatus)) {
commitOrAbortJob(jobContext, fileStatus.getPath(), false);
}
}
}
@Override
public void cleanupJob(JobContext context) throws IOException {
LOG.info("Running job cleanup.");
}
@Override
public boolean needsTaskCommit(TaskAttemptContext context) throws IOException {
TaskAttemptID taskAttemptID = context.getTaskAttemptID();
TaskType taskType = taskAttemptID.getTaskType();
if (taskType == TaskType.MAP && context.getNumReduceTasks() != 0) {
return false;
} else {
return true;
}
}
@Override
public void setupTask(TaskAttemptContext context) throws IOException {
LOG.info("Running task setup.");
}
private static class Conf {
Path _newIndex;
Configuration _configuration;
TaskAttemptID _taskAttemptID;
Path _indexPath;
TableDescriptor _tableDescriptor;
}
@Override
public void commitTask(TaskAttemptContext context) throws IOException {
LOG.info("Running commit task.");
Conf conf = setup(context);
FileSystem fileSystem = conf._newIndex.getFileSystem(conf._configuration);
if (fileSystem.exists(conf._newIndex) && !fileSystem.isFile(conf._newIndex)) {
Path dst = new Path(conf._indexPath, conf._taskAttemptID.toString() + ".task_complete");
LOG.info("Committing [{0}] to [{1}]", conf._newIndex, dst);
fileSystem.rename(conf._newIndex, dst);
} else {
throw new IOException("Path [" + conf._newIndex + "] does not exist, can not commit.");
}
}
@Override
public void abortTask(TaskAttemptContext context) throws IOException {
LOG.info("Running abort task.");
Conf conf = setup(context);
FileSystem fileSystem = conf._newIndex.getFileSystem(conf._configuration);
LOG.info("abortTask - Deleting [{0}]", conf._newIndex);
fileSystem.delete(conf._newIndex, true);
}
private Conf setup(TaskAttemptContext context) throws IOException {
LOG.info("Setting up committer with task attempt [{0}]", context.getTaskAttemptID().toString());
Conf conf = new Conf();
conf._configuration = context.getConfiguration();
conf._tableDescriptor = BlurOutputFormat.getTableDescriptor(conf._configuration);
int shardCount = conf._tableDescriptor.getShardCount();
int attemptId = context.getTaskAttemptID().getTaskID().getId();
int shardId = attemptId % shardCount;
conf._taskAttemptID = context.getTaskAttemptID();
Path tableOutput = BlurOutputFormat.getOutputPath(conf._configuration);
String shardName = BlurUtil.getShardName(BlurConstants.SHARD_PREFIX, shardId);
conf._indexPath = new Path(tableOutput, shardName);
conf._newIndex = new Path(conf._indexPath, conf._taskAttemptID.toString() + ".tmp");
return conf;
}
}