/
EsOutputFormat.java
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/
EsOutputFormat.java
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/*
* 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.Collections;
import java.util.List;
import java.util.Map;
import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;
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.mapred.TaskAttemptID;
import org.apache.hadoop.mapreduce.JobContext;
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.cfg.InternalConfigurationOptions;
import org.elasticsearch.hadoop.cfg.Settings;
import org.elasticsearch.hadoop.cfg.SettingsManager;
import org.elasticsearch.hadoop.rest.InitializationUtils;
import org.elasticsearch.hadoop.rest.RestRepository;
import org.elasticsearch.hadoop.rest.dto.Node;
import org.elasticsearch.hadoop.rest.dto.Shard;
import org.elasticsearch.hadoop.serialization.field.MapWritableFieldExtractor;
import org.elasticsearch.hadoop.util.Assert;
import org.elasticsearch.hadoop.util.SettingsUtils;
import org.elasticsearch.hadoop.util.StringUtils;
import static org.elasticsearch.hadoop.cfg.ConfigurationOptions.*;
/**
* ElasticSearch {@link OutputFormat} (old and new API) for adding data to an index inside ElasticSearch.
*/
@SuppressWarnings("rawtypes")
// since this class implements two generic interfaces, to avoid dealing with 4 types in every declaration, we force raw types...
public class EsOutputFormat extends OutputFormat implements org.apache.hadoop.mapred.OutputFormat {
private static Log log = LogFactory.getLog(EsOutputFormat.class);
// don't use mapred.OutputCommitter as it performs mandatory casts to old API resulting in CCE
public static class ESOutputCommitter extends org.apache.hadoop.mapreduce.OutputCommitter {
@Override
public void setupJob(JobContext jobContext) throws IOException {}
// compatibility check with Hadoop 0.20.2
@Deprecated
public void cleanupJob(JobContext jobContext) throws IOException {}
@Override
public void setupTask(TaskAttemptContext taskContext) throws IOException {
//no-op
}
@Override
public boolean needsTaskCommit(TaskAttemptContext taskContext) throws IOException {
//no-op
return false;
}
@Override
public void commitTask(TaskAttemptContext taskContext) throws IOException {
//no-op
}
@Override
public void abortTask(TaskAttemptContext taskContext) throws IOException {
//no-op
}
}
public static class ESOldAPIOutputCommitter extends org.apache.hadoop.mapred.OutputCommitter {
@Override
public void setupJob(org.apache.hadoop.mapred.JobContext jobContext) throws IOException {
//no-op
}
@Override
public void setupTask(org.apache.hadoop.mapred.TaskAttemptContext taskContext) throws IOException {
//no-op
}
@Override
public boolean needsTaskCommit(org.apache.hadoop.mapred.TaskAttemptContext taskContext) throws IOException {
//no-op
return false;
}
@Override
public void commitTask(org.apache.hadoop.mapred.TaskAttemptContext taskContext) throws IOException {
//no-op
}
@Override
public void abortTask(org.apache.hadoop.mapred.TaskAttemptContext taskContext) throws IOException {
//no-op
}
@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)
}
}
protected static class ESRecordWriter extends RecordWriter implements org.apache.hadoop.mapred.RecordWriter {
protected final Configuration cfg;
protected boolean initialized = false;
protected RestRepository client;
private String uri, resource;
public ESRecordWriter(Configuration cfg) {
this.cfg = cfg;
}
@Override
public void write(Object key, Object value) throws IOException {
if (!initialized) {
initialized = true;
init();
}
client.writeToIndex(value);
}
protected void init() throws IOException {
//int instances = detectNumberOfInstances(cfg);
int currentInstance = detectCurrentInstance(cfg);
if (log.isTraceEnabled()) {
log.trace(String.format("ESRecordWriter instance [%s] initiating discovery of target shard...", currentInstance));
}
Settings settings = SettingsManager.loadFrom(cfg);
InitializationUtils.setValueWriterIfNotSet(settings, WritableValueWriter.class, log);
InitializationUtils.setFieldExtractorIfNotSet(settings, MapWritableFieldExtractor.class, log);
InitializationUtils.discoverNodesIfNeeded(settings, log);
// pick the host based on id
List<String> nodes = SettingsUtils.nodes(settings);
Collections.rotate(nodes, -currentInstance);
settings.setProperty(InternalConfigurationOptions.INTERNAL_ES_HOSTS, StringUtils.concatenate(nodes, ","));
client = new RestRepository(settings);
resource = settings.getTargetResource();
// create the index if needed
if (client.touch()) {
if (client.waitForYellow()) {
log.warn(String.format("Timed out waiting for index [%s] to reach yellow health", resource));
}
}
Map<Shard, Node> targetShards = client.getTargetPrimaryShards();
client.close();
List<Shard> orderedShards = new ArrayList<Shard>(targetShards.keySet());
// make sure the order is strict
Collections.sort(orderedShards);
if (log.isTraceEnabled()) {
log.trace(String.format("ESRecordWriter instance [%s] discovered %s primary shards %s", currentInstance, orderedShards.size(), orderedShards));
}
//int min = Math.min(instances, targetShards.size());
int bucket = currentInstance % targetShards.size();
Shard chosenShard = orderedShards.get(bucket);
Node targetNode = targetShards.get(chosenShard);
// override the global settings to communicate directly with the target node
settings.cleanHosts().setHosts(targetNode.getIpAddress()).setPort(targetNode.getHttpPort());
client = new RestRepository(settings);
uri = settings.getTargetHosts();
if (log.isDebugEnabled()) {
log.debug(String.format("ESRecordWriter instance [%s] assigned to primary shard [%s] at address [%s]", currentInstance, chosenShard.getName(), uri));
}
}
private int detectCurrentInstance(Configuration conf) {
TaskAttemptID attempt = TaskAttemptID.forName(HadoopCfgUtils.getTaskAttemptId(conf));
Assert.notNull(attempt,
"Unable to determine task id - please report your distro/setting through the issue tracker");
return attempt.getTaskID().getId();
}
@Override
public void close(TaskAttemptContext context) throws IOException {
close((Reporter) null);
}
@Override
public void close(Reporter reporter) throws IOException {
if (log.isTraceEnabled()) {
log.trace(String.format("Closing RecordWriter [%s][%s]", uri, resource));
}
if (client != null) {
client.close();
}
initialized = false;
}
}
//
// new API - just delegates to the Old API
//
@Override
public org.apache.hadoop.mapreduce.RecordWriter getRecordWriter(TaskAttemptContext context) {
return (org.apache.hadoop.mapreduce.RecordWriter) getRecordWriter(null, (JobConf) context.getConfiguration(), null, context);
}
@Override
public void checkOutputSpecs(JobContext context) throws IOException {
// careful as it seems the info here saved by in the config is discarded
init(context.getConfiguration());
}
@Override
public org.apache.hadoop.mapreduce.OutputCommitter getOutputCommitter(TaskAttemptContext context) {
return new ESOutputCommitter();
}
//
// old API
//
@Override
public org.apache.hadoop.mapred.RecordWriter getRecordWriter(FileSystem ignored, JobConf job, String name, Progressable progress) {
return new ESRecordWriter(job);
}
@Override
public void checkOutputSpecs(FileSystem ignored, JobConf cfg) throws IOException {
init(cfg);
}
// NB: all changes to the config objects are discarded before the job is submitted if _the old MR api_ is used
private void init(Configuration cfg) throws IOException {
Settings settings = SettingsManager.loadFrom(cfg);
Assert.hasText(settings.getTargetResource(),
String.format("No resource ['%s'] (index/query/location) specified", ES_RESOURCE));
// lazy-init
RestRepository client = null;
InitializationUtils.checkIdForOperation(settings);
InitializationUtils.checkIndexExistence(settings, client);
if (HadoopCfgUtils.getReduceTasks(cfg) != null) {
if (HadoopCfgUtils.getSpeculativeReduce(cfg)) {
log.warn("Speculative execution enabled for reducer - consider disabling it to prevent data corruption");
}
}
else {
if (HadoopCfgUtils.getSpeculativeMap(cfg)) {
log.warn("Speculative execution enabled for mapper - consider disabling it to prevent data corruption");
}
}
//log.info(String.format("Starting to write/index to [%s][%s]", settings.getTargetUri(), settings.getTargetResource()));
}
}