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| <h1 id="kafka-emitter">Kafka Emitter</h1> |
| |
| <p>To use this Apache Druid (incubating) extension, make sure to <a href="../../operations/including-extensions.html">include</a> <code>kafka-emitter</code> extension.</p> |
| |
| <h2 id="introduction">Introduction</h2> |
| |
| <p>This extension emits Druid metrics to <a href="https://kafka.apache.org">Apache Kafka</a> directly with JSON format.<br> |
| Currently, Kafka has not only their nice ecosystem but also consumer API readily available. |
| So, If you currently use Kafka, It's easy to integrate various tool or UI |
| to monitor the status of your Druid cluster with this extension.</p> |
| |
| <h2 id="configuration">Configuration</h2> |
| |
| <p>All the configuration parameters for the Kafka emitter are under <code>druid.emitter.kafka</code>.</p> |
| |
| <table><thead> |
| <tr> |
| <th>property</th> |
| <th>description</th> |
| <th>required?</th> |
| <th>default</th> |
| </tr> |
| </thead><tbody> |
| <tr> |
| <td><code>druid.emitter.kafka.bootstrap.servers</code></td> |
| <td>Comma-separated Kafka broker. (<code>[hostname:port],[hostname:port]...</code>)</td> |
| <td>yes</td> |
| <td>none</td> |
| </tr> |
| <tr> |
| <td><code>druid.emitter.kafka.metric.topic</code></td> |
| <td>Kafka topic name for emitter's target to emit service metric.</td> |
| <td>yes</td> |
| <td>none</td> |
| </tr> |
| <tr> |
| <td><code>druid.emitter.kafka.alert.topic</code></td> |
| <td>Kafka topic name for emitter's target to emit alert.</td> |
| <td>yes</td> |
| <td>none</td> |
| </tr> |
| <tr> |
| <td><code>druid.emitter.kafka.producer.config</code></td> |
| <td>JSON formatted configuration which user want to set additional properties to Kafka producer.</td> |
| <td>no</td> |
| <td>none</td> |
| </tr> |
| <tr> |
| <td><code>druid.emitter.kafka.clusterName</code></td> |
| <td>Optional value to specify name of your druid cluster. It can help make groups in your monitoring environment.</td> |
| <td>no</td> |
| <td>none</td> |
| </tr> |
| </tbody></table> |
| |
| <h3 id="example">Example</h3> |
| <div class="highlight"><pre><code class="language-text" data-lang="text"><span></span>druid.emitter.kafka.bootstrap.servers=hostname1:9092,hostname2:9092 |
| druid.emitter.kafka.metric.topic=druid-metric |
| druid.emitter.kafka.alert.topic=druid-alert |
| druid.emitter.kafka.producer.config={"max.block.ms":10000} |
| </code></pre></div> |
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