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| |
| <h1 id="apache-druid-incubating-extensions">Apache Druid (incubating) extensions</h1> |
| |
| <p>Druid implements an extension system that allows for adding functionality at runtime. Extensions |
| are commonly used to add support for deep storages (like HDFS and S3), metadata stores (like MySQL |
| and PostgreSQL), new aggregators, new input formats, and so on.</p> |
| |
| <p>Production clusters will generally use at least two extensions; one for deep storage and one for a |
| metadata store. Many clusters will also use additional extensions.</p> |
| |
| <h2 id="including-extensions">Including extensions</h2> |
| |
| <p>Please see <a href="../operations/including-extensions.html">here</a>.</p> |
| |
| <h2 id="core-extensions">Core extensions</h2> |
| |
| <p>Core extensions are maintained by Druid committers.</p> |
| |
| <table><thead> |
| <tr> |
| <th>Name</th> |
| <th>Description</th> |
| <th>Docs</th> |
| </tr> |
| </thead><tbody> |
| <tr> |
| <td>druid-avro-extensions</td> |
| <td>Support for data in Apache Avro data format.</td> |
| <td><a href="../development/extensions-core/avro.html">link</a></td> |
| </tr> |
| <tr> |
| <td>druid-basic-security</td> |
| <td>Support for Basic HTTP authentication and role-based access control.</td> |
| <td><a href="../development/extensions-core/druid-basic-security.html">link</a></td> |
| </tr> |
| <tr> |
| <td>druid-bloom-filter</td> |
| <td>Support for providing Bloom filters in druid queries.</td> |
| <td><a href="../development/extensions-core/bloom-filter.html">link</a></td> |
| </tr> |
| <tr> |
| <td>druid-caffeine-cache</td> |
| <td>A local cache implementation backed by Caffeine.</td> |
| <td><a href="../configuration/index.html#cache-configuration">link</a></td> |
| </tr> |
| <tr> |
| <td>druid-datasketches</td> |
| <td>Support for approximate counts and set operations with <a href="http://datasketches.github.io/">DataSketches</a>.</td> |
| <td><a href="../development/extensions-core/datasketches-extension.html">link</a></td> |
| </tr> |
| <tr> |
| <td>druid-hdfs-storage</td> |
| <td>HDFS deep storage.</td> |
| <td><a href="../development/extensions-core/hdfs.html">link</a></td> |
| </tr> |
| <tr> |
| <td>druid-histogram</td> |
| <td>Approximate histograms and quantiles aggregator. Deprecated, please use the <a href="../development/extensions-core/datasketches-quantiles.html">DataSketches quantiles aggregator</a> from the <code>druid-datasketches</code> extension instead.</td> |
| <td><a href="../development/extensions-core/approximate-histograms.html">link</a></td> |
| </tr> |
| <tr> |
| <td>druid-kafka-eight</td> |
| <td>Kafka ingest firehose (high level consumer) for realtime nodes(deprecated).</td> |
| <td><a href="../development/extensions-core/kafka-eight-firehose.html">link</a></td> |
| </tr> |
| <tr> |
| <td>druid-kafka-extraction-namespace</td> |
| <td>Kafka-based namespaced lookup. Requires namespace lookup extension.</td> |
| <td><a href="../development/extensions-core/kafka-extraction-namespace.html">link</a></td> |
| </tr> |
| <tr> |
| <td>druid-kafka-indexing-service</td> |
| <td>Supervised exactly-once Kafka ingestion for the indexing service.</td> |
| <td><a href="../development/extensions-core/kafka-ingestion.html">link</a></td> |
| </tr> |
| <tr> |
| <td>druid-kinesis-indexing-service</td> |
| <td>Supervised exactly-once Kinesis ingestion for the indexing service.</td> |
| <td><a href="../development/extensions-core/kinesis-ingestion.html">link</a></td> |
| </tr> |
| <tr> |
| <td>druid-kerberos</td> |
| <td>Kerberos authentication for druid processes.</td> |
| <td><a href="../development/extensions-core/druid-kerberos.html">link</a></td> |
| </tr> |
| <tr> |
| <td>druid-lookups-cached-global</td> |
| <td>A module for <a href="../querying/lookups.html">lookups</a> providing a jvm-global eager caching for lookups. It provides JDBC and URI implementations for fetching lookup data.</td> |
| <td><a href="../development/extensions-core/lookups-cached-global.html">link</a></td> |
| </tr> |
| <tr> |
| <td>druid-lookups-cached-single</td> |
| <td>Per lookup caching module to support the use cases where a lookup need to be isolated from the global pool of lookups</td> |
| <td><a href="../development/extensions-core/druid-lookups.html">link</a></td> |
| </tr> |
| <tr> |
| <td>druid-orc-extensions</td> |
| <td>Support for data in Apache Orc data format.</td> |
| <td><a href="../development/extensions-core/orc.html">link</a></td> |
| </tr> |
| <tr> |
| <td>druid-parquet-extensions</td> |
| <td>Support for data in Apache Parquet data format. Requires druid-avro-extensions to be loaded.</td> |
| <td><a href="../development/extensions-core/parquet.html">link</a></td> |
| </tr> |
| <tr> |
| <td>druid-protobuf-extensions</td> |
| <td>Support for data in Protobuf data format.</td> |
| <td><a href="../development/extensions-core/protobuf.html">link</a></td> |
| </tr> |
| <tr> |
| <td>druid-s3-extensions</td> |
| <td>Interfacing with data in AWS S3, and using S3 as deep storage.</td> |
| <td><a href="../development/extensions-core/s3.html">link</a></td> |
| </tr> |
| <tr> |
| <td>druid-ec2-extensions</td> |
| <td>Interfacing with AWS EC2 for autoscaling middle managers</td> |
| <td>UNDOCUMENTED</td> |
| </tr> |
| <tr> |
| <td>druid-stats</td> |
| <td>Statistics related module including variance and standard deviation.</td> |
| <td><a href="../development/extensions-core/stats.html">link</a></td> |
| </tr> |
| <tr> |
| <td>mysql-metadata-storage</td> |
| <td>MySQL metadata store.</td> |
| <td><a href="../development/extensions-core/mysql.html">link</a></td> |
| </tr> |
| <tr> |
| <td>postgresql-metadata-storage</td> |
| <td>PostgreSQL metadata store.</td> |
| <td><a href="../development/extensions-core/postgresql.html">link</a></td> |
| </tr> |
| <tr> |
| <td>simple-client-sslcontext</td> |
| <td>Simple SSLContext provider module to be used by Druid's internal HttpClient when talking to other Druid processes over HTTPS.</td> |
| <td><a href="../development/extensions-core/simple-client-sslcontext.html">link</a></td> |
| </tr> |
| </tbody></table> |
| |
| <h1 id="community-extensions">Community Extensions</h1> |
| |
| <div class="note caution"> |
| Community extensions are not maintained by Druid committers, although we accept patches from community members using these extensions. They may not have been as extensively tested as the core extensions. |
| </div> |
| |
| <p>A number of community members have contributed their own extensions to Druid that are not packaged with the default Druid tarball. |
| If you'd like to take on maintenance for a community extension, please post on <a href="https://lists.apache.org/list.html?dev@druid.apache.org">dev@druid.apache.org</a> to let us know!</p> |
| |
| <p>All of these community extensions can be downloaded using <em>pull-deps</em> with the coordinate org.apache.druid.extensions.contrib:EXTENSION_NAME:LATEST_DRUID_STABLE_VERSION.</p> |
| |
| <table><thead> |
| <tr> |
| <th>Name</th> |
| <th>Description</th> |
| <th>Docs</th> |
| </tr> |
| </thead><tbody> |
| <tr> |
| <td>ambari-metrics-emitter</td> |
| <td>Ambari Metrics Emitter</td> |
| <td><a href="../development/extensions-contrib/ambari-metrics-emitter.html">link</a></td> |
| </tr> |
| <tr> |
| <td>druid-azure-extensions</td> |
| <td>Microsoft Azure deep storage.</td> |
| <td><a href="../development/extensions-contrib/azure.html">link</a></td> |
| </tr> |
| <tr> |
| <td>druid-cassandra-storage</td> |
| <td>Apache Cassandra deep storage.</td> |
| <td><a href="../development/extensions-contrib/cassandra.html">link</a></td> |
| </tr> |
| <tr> |
| <td>druid-cloudfiles-extensions</td> |
| <td>Rackspace Cloudfiles deep storage and firehose.</td> |
| <td><a href="../development/extensions-contrib/cloudfiles.html">link</a></td> |
| </tr> |
| <tr> |
| <td>druid-distinctcount</td> |
| <td>DistinctCount aggregator</td> |
| <td><a href="../development/extensions-contrib/distinctcount.html">link</a></td> |
| </tr> |
| <tr> |
| <td>druid-kafka-eight-simpleConsumer</td> |
| <td>Kafka ingest firehose (low level consumer)(deprecated).</td> |
| <td><a href="../development/extensions-contrib/kafka-simple.html">link</a></td> |
| </tr> |
| <tr> |
| <td>druid-rabbitmq</td> |
| <td>RabbitMQ firehose.</td> |
| <td><a href="../development/extensions-contrib/rabbitmq.html">link</a></td> |
| </tr> |
| <tr> |
| <td>druid-redis-cache</td> |
| <td>A cache implementation for Druid based on Redis.</td> |
| <td><a href="../development/extensions-contrib/redis-cache.html">link</a></td> |
| </tr> |
| <tr> |
| <td>druid-rocketmq</td> |
| <td>RocketMQ firehose.</td> |
| <td><a href="../development/extensions-contrib/rocketmq.html">link</a></td> |
| </tr> |
| <tr> |
| <td>druid-time-min-max</td> |
| <td>Min/Max aggregator for timestamp.</td> |
| <td><a href="../development/extensions-contrib/time-min-max.html">link</a></td> |
| </tr> |
| <tr> |
| <td>druid-google-extensions</td> |
| <td>Google Cloud Storage deep storage.</td> |
| <td><a href="../development/extensions-contrib/google.html">link</a></td> |
| </tr> |
| <tr> |
| <td>sqlserver-metadata-storage</td> |
| <td>Microsoft SqlServer deep storage.</td> |
| <td><a href="../development/extensions-contrib/sqlserver.html">link</a></td> |
| </tr> |
| <tr> |
| <td>graphite-emitter</td> |
| <td>Graphite metrics emitter</td> |
| <td><a href="../development/extensions-contrib/graphite.html">link</a></td> |
| </tr> |
| <tr> |
| <td>statsd-emitter</td> |
| <td>StatsD metrics emitter</td> |
| <td><a href="../development/extensions-contrib/statsd.html">link</a></td> |
| </tr> |
| <tr> |
| <td>kafka-emitter</td> |
| <td>Kafka metrics emitter</td> |
| <td><a href="../development/extensions-contrib/kafka-emitter.html">link</a></td> |
| </tr> |
| <tr> |
| <td>druid-thrift-extensions</td> |
| <td>Support thrift ingestion</td> |
| <td><a href="../development/extensions-contrib/thrift.html">link</a></td> |
| </tr> |
| <tr> |
| <td>druid-opentsdb-emitter</td> |
| <td>OpenTSDB metrics emitter</td> |
| <td><a href="../development/extensions-contrib/opentsdb-emitter.html">link</a></td> |
| </tr> |
| <tr> |
| <td>druid-moving-average-query</td> |
| <td>Support for <a href="https://en.wikipedia.org/wiki/Moving_average">Moving Average</a> and other Aggregate <a href="https://en.wikibooks.org/wiki/Structured_Query_Language/Window_functions">Window Functions</a> in Druid queries.</td> |
| <td><a href="../development/extensions-contrib/moving-average-query.html">link</a></td> |
| </tr> |
| </tbody></table> |
| |
| <h2 id="promoting-community-extension-to-core-extension">Promoting Community Extension to Core Extension</h2> |
| |
| <p>Please post on <a href="https://lists.apache.org/list.html?dev@druid.apache.org">dev@druid.apache.org</a> if you'd like an extension to be promoted to core. |
| If we see a community extension actively supported by the community, we can promote it to core based on community feedback.</p> |
| |
| <h1 id="creating-your-own-extensions">Creating your own Extensions</h1> |
| |
| <p>For information how to create your own extension, please see <a href="../development/modules.html">here</a>.</p> |
| |
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