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| <h1 id="tutorial-load-streaming-data-from-kafka">Tutorial: Load streaming data from Kafka</h1> |
| |
| <h2 id="getting-started">Getting started</h2> |
| |
| <p>This tutorial demonstrates how to load data from a Kafka stream, using the Druid Kafka indexing service.</p> |
| |
| <p>For this tutorial, we'll assume you've already downloaded Druid as described in |
| the <a href="index.html">single-machine quickstart</a> and have it running on your local machine. You |
| don't need to have loaded any data yet.</p> |
| |
| <h2 id="download-and-start-kafka">Download and start Kafka</h2> |
| |
| <p><a href="http://kafka.apache.org/">Apache Kafka</a> is a high throughput message bus that works well with |
| Druid. For this tutorial, we will use Kafka 0.10.2.0. To download Kafka, issue the following |
| commands in your terminal:</p> |
| <div class="highlight"><pre><code class="language-bash" data-lang="bash"><span></span>curl -O https://archive.apache.org/dist/kafka/0.10.2.0/kafka_2.11-0.10.2.0.tgz |
| tar -xzf kafka_2.11-0.10.2.0.tgz |
| <span class="nb">cd</span> kafka_2.11-0.10.2.0 |
| </code></pre></div> |
| <p>Start a Kafka broker by running the following command in a new terminal:</p> |
| <div class="highlight"><pre><code class="language-bash" data-lang="bash"><span></span>./bin/kafka-server-start.sh config/server.properties |
| </code></pre></div> |
| <p>Run this command to create a Kafka topic called <em>wikipedia</em>, to which we'll send data:</p> |
| <div class="highlight"><pre><code class="language-bash" data-lang="bash"><span></span>./bin/kafka-topics.sh --create --zookeeper localhost:2181 --replication-factor <span class="m">1</span> --partitions <span class="m">1</span> --topic wikipedia |
| </code></pre></div> |
| <h2 id="enable-druid-kafka-ingestion">Enable Druid Kafka ingestion</h2> |
| |
| <p>We will use Druid's Kafka indexing service to ingest messages from our newly created <em>wikipedia</em> topic. To start the |
| service, we will need to submit a supervisor spec to the Druid overlord by running the following from the Druid package root:</p> |
| <div class="highlight"><pre><code class="language-bash" data-lang="bash"><span></span>curl -XPOST -H<span class="s1">'Content-Type: application/json'</span> -d @quickstart/tutorial/wikipedia-kafka-supervisor.json http://localhost:8090/druid/indexer/v1/supervisor |
| </code></pre></div> |
| <p>If the supervisor was successfully created, you will get a response containing the ID of the supervisor; in our case we should see <code>{"id":"wikipedia-kafka"}</code>.</p> |
| |
| <p>For more details about what's going on here, check out the |
| <a href="../development/extensions-core/kafka-ingestion.html">Druid Kafka indexing service documentation</a>.</p> |
| |
| <h2 id="load-data">Load data</h2> |
| |
| <p>Let's launch a console producer for our topic and send some data!</p> |
| |
| <p>In your Druid directory, run the following command:</p> |
| <div class="highlight"><pre><code class="language-bash" data-lang="bash"><span></span><span class="nb">cd</span> quickstart/tutorial |
| gunzip -k wikiticker-2015-09-12-sampled.json.gz |
| </code></pre></div> |
| <p>In your Kafka directory, run the following command, where {PATH_TO_DRUID} is replaced by the path to the Druid directory:</p> |
| <div class="highlight"><pre><code class="language-bash" data-lang="bash"><span></span><span class="nb">export</span> <span class="nv">KAFKA_OPTS</span><span class="o">=</span><span class="s2">"-Dfile.encoding=UTF-8"</span> |
| ./bin/kafka-console-producer.sh --broker-list localhost:9092 --topic wikipedia < <span class="o">{</span>PATH_TO_DRUID<span class="o">}</span>/quickstart/tutorial/wikiticker-2015-09-12-sampled.json |
| </code></pre></div> |
| <p>The previous command posted sample events to the <em>wikipedia</em> Kafka topic which were then ingested into Druid by the Kafka indexing service. You're now ready to run some queries!</p> |
| |
| <h2 id="querying-your-data">Querying your data</h2> |
| |
| <p>After data is sent to the Kafka stream, it is immediately available for querying.</p> |
| |
| <p>Please follow the <a href="../tutorials/tutorial-query.html">query tutorial</a> to run some example queries on the newly loaded data.</p> |
| |
| <h2 id="cleanup">Cleanup</h2> |
| |
| <p>If you wish to go through any of the other ingestion tutorials, you will need to shut down the cluster and reset the cluster state by removing the contents of the <code>var</code> directory under the druid package, as the other tutorials will write to the same "wikipedia" datasource.</p> |
| |
| <h2 id="further-reading">Further reading</h2> |
| |
| <p>For more information on loading data from Kafka streams, please see the <a href="../development/extensions-core/kafka-ingestion.html">Druid Kafka indexing service documentation</a>.</p> |
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