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Elasticsearch Hadoop Map/Reduce
/*
* Licensed to Elasticsearch under one or more contributor
* license agreements. See the NOTICE file distributed with
* this work for additional information regarding copyright
* ownership. Elasticsearch 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.elasticsearch.hadoop.mr;
import java.io.IOException;
import java.util.ArrayList;
import java.util.Collection;
import java.util.List;
import org.apache.hadoop.conf.Configuration;
import org.apache.hadoop.fs.FileSystem;
import org.apache.hadoop.mapred.JobConf;
import org.apache.hadoop.mapred.Reporter;
import org.apache.hadoop.mapreduce.JobContext;
import org.apache.hadoop.mapreduce.OutputCommitter;
import org.apache.hadoop.mapreduce.OutputFormat;
import org.apache.hadoop.mapreduce.RecordWriter;
import org.apache.hadoop.mapreduce.TaskAttemptContext;
import org.apache.hadoop.util.Progressable;
import org.elasticsearch.hadoop.mr.compat.CompatHandler;
import org.elasticsearch.hadoop.util.StringUtils;
public class MultiOutputFormat extends OutputFormat implements org.apache.hadoop.mapred.OutputFormat {
private static class MultiNewRecordWriter extends RecordWriter {
private final List writers;
public MultiNewRecordWriter(List writers) {
this.writers = writers;
}
@Override
public void write(Object key, Object value) throws IOException, InterruptedException {
for (RecordWriter writer : writers) {
writer.write(key, value);
}
}
@Override
public void close(TaskAttemptContext context) throws IOException, InterruptedException {
for (RecordWriter writer : writers) {
writer.close(context);
}
}
}
private static class MultiOldRecordWriter implements org.apache.hadoop.mapred.RecordWriter {
private final List writers;
public MultiOldRecordWriter(List writers) {
this.writers = writers;
}
@Override
public void close(Reporter reporter) throws IOException {
for (org.apache.hadoop.mapred.RecordWriter writer : writers) {
writer.close(reporter);
}
}
@Override
public void write(Object key, Object value) throws IOException {
for (org.apache.hadoop.mapred.RecordWriter writer : writers) {
writer.write(key, value);
}
}
}
private static class MultiNewOutputCommitter extends org.apache.hadoop.mapreduce.OutputCommitter {
private final List committers;
MultiNewOutputCommitter(List committers) {
this.committers = committers;
}
@Override
public void setupJob(JobContext jobContext) throws IOException {
for (OutputCommitter committer : committers) {
committer.setupJob(jobContext);
}
}
@Override
public void setupTask(TaskAttemptContext taskContext) throws IOException {
for (OutputCommitter committer : committers) {
committer.setupTask(taskContext);
}
}
@Override
public boolean needsTaskCommit(TaskAttemptContext taskContext) throws IOException {
boolean result = false;
for (OutputCommitter committer : committers) {
result |= committer.needsTaskCommit(taskContext);
}
return result;
}
@Override
public void commitTask(TaskAttemptContext taskContext) throws IOException {
for (OutputCommitter committer : committers) {
committer.commitTask(taskContext);
}
}
@Override
public void abortTask(TaskAttemptContext taskContext) throws IOException {
for (OutputCommitter committer : committers) {
committer.abortTask(taskContext);
}
}
}
private static class MultiOldOutputCommitter extends org.apache.hadoop.mapred.OutputCommitter {
private final List committers;
MultiOldOutputCommitter(List committers) {
this.committers = committers;
}
@Override
public void setupJob(org.apache.hadoop.mapred.JobContext jobContext) throws IOException {
for (OutputCommitter committer : committers) {
committer.setupJob(jobContext);
}
}
@Override
public void setupTask(org.apache.hadoop.mapred.TaskAttemptContext taskContext) throws IOException {
for (OutputCommitter committer : committers) {
committer.setupTask(taskContext);
}
}
@Override
public boolean needsTaskCommit(org.apache.hadoop.mapred.TaskAttemptContext taskContext) throws IOException {
boolean result = false;
for (OutputCommitter committer : committers) {
result |= committer.needsTaskCommit(taskContext);
}
return result;
}
@Override
public void commitTask(org.apache.hadoop.mapred.TaskAttemptContext taskContext) throws IOException {
for (OutputCommitter committer : committers) {
committer.commitTask(taskContext);
}
}
@Override
public void abortTask(org.apache.hadoop.mapred.TaskAttemptContext taskContext) throws IOException {
for (OutputCommitter committer : committers) {
committer.abortTask(taskContext);
}
}
@Override
@Deprecated
public void cleanupJob(org.apache.hadoop.mapred.JobContext context) throws IOException {
// no-op
// added for compatibility with hadoop 0.20.x (used by old tools, such as Cascalog)
for (OutputCommitter committer : committers) {
committer.cleanupJob(context);
}
}
}
public static final String CFG_FIELD = "es.hadoop.multi.of";
private transient List newApiFormat = null;
private transient List oldApiFormat = null;
//
// Old API
//
@Override
public org.apache.hadoop.mapred.RecordWriter getRecordWriter(FileSystem ignored, JobConf job, String name, Progressable progress)
throws IOException {
List formats = getOldApiFormats(job);
List writers = new ArrayList();
for (org.apache.hadoop.mapred.OutputFormat format : formats) {
writers.add(format.getRecordWriter(ignored, job, name, progress));
}
return new MultiOldRecordWriter(writers);
}
@Override
public void checkOutputSpecs(FileSystem ignored, JobConf job) throws IOException {
List formats = getOldApiFormats(job);
for (org.apache.hadoop.mapred.OutputFormat format : formats) {
format.checkOutputSpecs(ignored, job);
}
}
//
// new API
//
@Override
public RecordWriter getRecordWriter(TaskAttemptContext context) throws IOException, InterruptedException {
List formats = getNewApiFormats(CompatHandler.taskAttemptContext(context).getConfiguration());
List writers = new ArrayList();
for (OutputFormat format : formats) {
writers.add(format.getRecordWriter(context));
}
return new MultiNewRecordWriter(writers);
}
@Override
public void checkOutputSpecs(JobContext context) throws IOException, InterruptedException {
List formats = getNewApiFormats(CompatHandler.jobContext(context).getConfiguration());
for (OutputFormat format : formats) {
format.checkOutputSpecs(context);
}
}
@Override
public OutputCommitter getOutputCommitter(TaskAttemptContext context) throws IOException, InterruptedException {
List formats = getNewApiFormats(CompatHandler.taskAttemptContext(context).getConfiguration());
List committers = new ArrayList();
for (OutputFormat format : formats) {
committers.add(format.getOutputCommitter(context));
}
return new MultiNewOutputCommitter(committers);
}
public static void addOutputFormat(Configuration cfg, Class... formats) {
Collection of = cfg.getStringCollection(CFG_FIELD);
for (Class format : formats) {
of.add(format.getName());
}
cfg.setStrings(CFG_FIELD, StringUtils.concatenate(of, ","));
}
private List getNewApiFormats(Configuration cfg) {
if (newApiFormat == null) {
newApiFormat = cfg.getInstances(CFG_FIELD, OutputFormat.class);
}
return newApiFormat;
}
private List getOldApiFormats(Configuration cfg) {
if (oldApiFormat == null) {
oldApiFormat = cfg.getInstances(CFG_FIELD, org.apache.hadoop.mapred.OutputFormat.class);
}
return oldApiFormat;
}
}