Last active
December 16, 2015 11:39
-
-
Save tzolov/5429016 to your computer and use it in GitHub Desktop.
Example ElasticSerach Crunch Integration (using ElasticSearch-Hadoop) Application reads a sample 'twitter' index from ES, counts the messages per user and writes the result counts to different ES index. This example uses {@link Map} as a mean to represent the data read-from and written-to ES.
Prerequisite: latest Crunch:0.6.0-SNAPSHOT and latest…
This file contains bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that reveals hidden Unicode characters.
Learn more about bidirectional Unicode characters
/* | |
* Copyright 2013 the original author or authors. | |
* | |
* Licensed 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 net.tzolov.es; | |
import java.io.Serializable; | |
import java.util.Map; | |
import org.apache.crunch.MapFn; | |
import org.apache.crunch.Pair; | |
import org.apache.crunch.Pipeline; | |
import org.apache.crunch.impl.mr.MRPipeline; | |
import org.apache.crunch.types.writable.Writables; | |
import org.apache.hadoop.conf.Configuration; | |
import org.apache.hadoop.conf.Configured; | |
import org.apache.hadoop.util.GenericOptionsParser; | |
import org.apache.hadoop.util.Tool; | |
import org.apache.hadoop.util.ToolRunner; | |
import org.elasticsearch.hadoop.crunch.ESTarget; | |
import org.elasticsearch.hadoop.crunch.ESTypedSource; | |
import org.elasticsearch.hadoop.crunch.ESTypes; | |
import com.google.common.collect.Maps; | |
/** | |
* ElasticSerach-Hadoop (via Crunch) Integration. | |
* | |
* Application reads a 'twitter' index from ES, counts the messages per user and writes the result counts to different ES index. | |
* | |
* This example uses {@link Map} as a mean to represent the data read-from and written-to ES. | |
* | |
* Prerequisite: latest Crunch:0.6.0-SNAPSHOT and latest ES-Hadoop. | |
* | |
* Run: hadoop jar target/es-hadoop-integration-1.0-SNAPSHOT-job.jar <ES server name> <ES server port> | |
* | |
* (Christian Tzolov) tzolov@apache.org | |
*/ | |
@SuppressWarnings({ "rawtypes", "unchecked" }) | |
public class ESCrunch extends Configured implements Tool, Serializable { | |
public static void main(String[] args) throws Exception { | |
ToolRunner.run(new Configuration(), new ESCrunch(), args); | |
} | |
public int run(String[] args) throws Exception { | |
if (args.length != 2) { | |
System.err.println("Usage: hadoop jar es-hadoop-integration-1.0-SNAPSHOT-job.jar [generic options] esHost esPort \n"); | |
GenericOptionsParser.printGenericCommandUsage(System.err); | |
return 1; | |
} | |
String esHost = args[0].trim(); | |
Integer esPort = Integer.valueOf(args[1].trim()); | |
Pipeline pipeline = new MRPipeline(ESCrunch.class, getConf()); | |
ESTypedSource<Map> esSource = new ESTypedSource.Builder<Map>("twitter/tweet/_search?q=user:*", Map.class).setHost(esHost).setPort(esPort).build(); | |
ESTarget esTarget = new ESTarget.Builder("statistics/count").setHost(esHost).setPort(esPort).build(); | |
pipeline | |
.read(esSource) // query twitter index from ES | |
.parallelDo("ToUserName", new ExtractField("user"), Writables.strings()) // extract the user names | |
.count() // compute messages per user | |
.parallelDo("ToJavaMap", new ConvertToJavaMap(), ESTypes.map()) // convert counts into java Map | |
.write(esTarget); // create or update the ES 'statistics' index | |
return pipeline.done().succeeded() ? 0 : 1; | |
} | |
static class ExtractField extends MapFn<Map, String> { | |
private String fieldName; | |
public ExtractField(String fieldName) { | |
this.fieldName = fieldName; | |
} | |
public String map(Map tweet) { | |
return tweet.get(fieldName).toString(); | |
} | |
} | |
static class ConvertToJavaMap extends MapFn<Pair<String, Long>, Map> { | |
private Map map = Maps.newHashMap(); | |
public Map map(Pair<String, Long> messageCount) { | |
map.clear(); | |
map.put("userName", messageCount.first()); | |
map.put("tweetCount", messageCount.second()); | |
return map; | |
} | |
} | |
} |
Sign up for free
to join this conversation on GitHub.
Already have an account?
Sign in to comment