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Elasticsearch real-time search and analytics natively integrated with Hadoop

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README.md

Elasticsearch Hadoop Build Status

Elasticsearch real-time search and analytics natively integrated with Hadoop. Supports MapReduce, Cascading, Hive and Pig.

See the official project page and documentation for more, in-depth information.

Requirements

Elasticsearch (0.9X series or 1.0.0 or higher) cluster accessible through REST. That's it! Significant effort has been invested to create a small, dependency-free, self-contained jar that can be downloaded and put to use without any dependencies. Simply make it available to your job classpath and you're set. For a certain library, see the dedicated chapter.

Installation

Release 1.3.0 M3

Available through any Maven-compatible tool:

<dependency>
  <groupId>org.elasticsearch</groupId>
  <artifactId>elasticsearch-hadoop</artifactId>
  <version>1.3.0.M3</version>
</dependency>

or as a stand-alone ZIP.

Development Snapshot

Grab the latest nightly build from the repository again through Maven:

<dependency>
  <groupId>org.elasticsearch</groupId>
  <artifactId>elasticsearch-hadoop</artifactId>
  <version>1.3.0.BUILD-SNAPSHOT</version>
</dependency>
<repositories>
  <repository>
    <id>sonatype-oss</id>
    <url>http://oss.sonatype.org/content/repositories/snapshots</url>
    <snapshots><enabled>true</enabled></snapshots>
  </repository>
</repositories>

or build the project yourself.

We do build and test the code on each commit.

Hadoop 2.0/YARN build

It does not matter if you are using Hadoop 1.x or 2.x, the same jar works across both Hadoop environments (since 1.3 M3). More information in this section.

Feedback / Q&A

We're interested in your feedback! You can find us on the User mailing list - please append [Hadoop] to the post subject to filter it out. For more details, see the community page.

Usage

Configuration Properties

All configuration properties start with es prefix. Note that the es.internal namespace is reserved for the library internal use and should not be used by the user at any point. The properties are read mainly from the Hadoop configuration but the user can specify (some of) them directly depending on the library used.

Required

es.resource=<ES resource location, relative to the host/port specified above>

Essential

es.query=<uri or query dsl query>              # defaults to {"query":{"match_all":{}}}
es.nodes=<ES host address>                     # defaults to localhost
es.port=<ES REST port>                         # defaults to 9200

The full list is available here

MapReduce

For basic, low-level or performance-sensitive environments, ES-Hadoop provides dedicated InputFormat and OutputFormat that read and write data to Elasticsearch. To use them, add the es-hadoop jar to your job classpath (either by bundling the library along - it's ~300kB and there are no-dependencies), using the DistributedCache or by provisioning the cluster manually.

Note that es-hadoop supports both the so-called 'old' and the 'new' API through its EsInputFormat and EsOutputFormat classes.

'Old' (org.apache.hadoop.mapred) API

Reading

To read data from ES, configure the EsInputFormat on your job configuration along with the relevant properties:

JobConf conf = new JobConf();
conf.setInputFormat(EsInputFormat.class);
conf.set("es.resource", "radio/artists"); 
conf.set("es.query", "?q=me*");             // replace this with the relevant query
...
JobClient.runJob(conf);

Writing

Same configuration template can be used for writing but using EsOuputFormat:

JobConf conf = new JobConf();
conf.setOutputFormat(EsOutputFormat.class);
conf.set("es.resource", "radio/artists"); // index or indices used for storing data
...
JobClient.runJob(conf);

'New' (org.apache.hadoop.mapreduce) API

Reading

Configuration conf = new Configuration();
conf.set("es.resource", "radio/artists"); 
conf.set("es.query", "?q=me*");             // replace this with the relevant query
Job job = new Job(conf)
job.setInputFormat(EsInputFormat.class);
...
job.waitForCompletion(true);

Writing

Configuration conf = new Configuration();
conf.set("es.resource", "radio/artists"); // index or indices used for storing data
Job job = new Job(conf)
job.setOutputFormat(EsOutputFormat.class);
...
job.waitForCompletion(true);

Hive

ES-Hadoop provides a Hive storage handler for Elasticsearch, meaning one can define an external table on top of ES.

Add es-hadoop-.jar to hive.aux.jars.path or register it manually in your Hive script (recommended):

ADD JAR /path_to_jar/es-hadoop-<version>.jar;

Reading

To read data from ES, define a table backed by the desired index:

CREATE EXTERNAL TABLE artists (
    id      BIGINT,
    name    STRING,
    links   STRUCT<url:STRING, picture:STRING>)
STORED BY 'org.elasticsearch.hadoop.hive.EsStorageHandler'
TBLPROPERTIES('es.resource' = 'radio/artists', 'es.query' = '?q=me*');

The fields defined in the table are mapped to the JSON when communicating with Elasticsearch. Notice the use of TBLPROPERTIES to define the location, that is the query used for reading from this table:

SELECT FROM artists;

Writing

To write data, a similar definition is used but with a different es.resource:

CREATE EXTERNAL TABLE artists (
    id      BIGINT,
    name    STRING,
    links   STRUCT<url:STRING, picture:STRING>)
STORED BY 'org.elasticsearch.hadoop.hive.EsStorageHandler'
TBLPROPERTIES('es.resource' = 'radio/artists');

Any data passed to the table is then passed down to Elasticsearch; for example considering a table s, mapped to a TSV/CSV file, one can index it to Elasticsearch like this:

INSERT OVERWRITE TABLE artists 
    SELECT NULL, s.name, named_struct('url', s.url, 'picture', s.picture) FROM source s;

As one can note, currently the reading and writing are treated separately but we're working on unifying the two and automatically translating HiveQL to Elasticsearch queries.

Pig

ES-Hadoop provides both read and write functions for Pig so you can access Elasticsearch from Pig scripts.

Register ES-Hadoop jar into your script or add it to your Pig classpath:

REGISTER /path_to_jar/es-hadoop-<version>.jar;

Additionally one can define an alias to save some chars:

%define ESSTORAGE org.elasticsearch.hadoop.pig.EsStorage()

and use $ESSTORAGE for storage definition.

Reading

To read data from ES, use EsStorage and specify the query through the LOAD function:

A = LOAD 'radio/artists' USING org.elasticsearch.hadoop.pig.EsStorage('es.query=?q=me*');
DUMP A;

Writing

Use the same Storage to write data to Elasticsearch:

A = LOAD 'src/artists.dat' USING PigStorage() AS (id:long, name, url:chararray, picture: chararray);
B = FOREACH A GENERATE name, TOTUPLE(url, picture) AS links;
STORE B INTO 'radio/artists' USING org.elasticsearch.hadoop.pig.EsStorage();

Cascading

ES-Hadoop offers a dedicate Elasticsearch Tap, EsTap that can be used both as a sink or a source. Note that EsTap can be used in both local (LocalFlowConnector) and Hadoop (HadoopFlowConnector) flows:

Reading

Tap in = new EsTap("radio/artists", "?q=me*");
Tap out = new StdOut(new TextLine());
new LocalFlowConnector().connect(in, out, new Pipe("read-from-ES")).complete();

Writing

Tap in = Lfs(new TextDelimited(new Fields("id", "name", "url", "picture")), "src/test/resources/artists.dat");
Tap out = new EsTap("radio/artists", new Fields("name", "url", "picture"));
new HadoopFlowConnector().connect(in, out, new Pipe("write-to-ES")).complete();

Building the source

Elasticsearch Hadoop uses Gradle for its build system and it is not required to have it installed on your machine. By default, it automatically runs unit tests. For integration testing, use the integrationTests task. See gradlew tasks for more information.

To create a distributable jar, run gradlew distZip from the command line; once completed you will find the jar in build/libs.

License

This project is released under version 2.0 of the Apache License

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.
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