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| <h1 id="kafka-simple-consumer">Kafka Simple Consumer</h1> |
| |
| <p>To use this Apache Druid (incubating) extension, make sure to <a href="../../operations/including-extensions.html">include</a> <code>druid-kafka-eight-simpleConsumer</code> extension.</p> |
| |
| <h2 id="firehose">Firehose</h2> |
| |
| <p>This is an experimental firehose to ingest data from Apache Kafka using the Kafka simple consumer api. Currently, this firehose would only work inside standalone realtime processes. |
| The configuration for KafkaSimpleConsumerFirehose is similar to the Kafka Eight Firehose , except <code>firehose</code> should be replaced with <code>firehoseV2</code> like this:</p> |
| <div class="highlight"><pre><code class="language-json" data-lang="json"><span></span><span class="s2">"firehoseV2"</span><span class="err">:</span> <span class="p">{</span> |
| <span class="nt">"type"</span> <span class="p">:</span> <span class="s2">"kafka-0.8-v2"</span><span class="p">,</span> |
| <span class="nt">"brokerList"</span> <span class="p">:</span> <span class="p">[</span><span class="s2">"localhost:4443"</span><span class="p">],</span> |
| <span class="nt">"queueBufferLength"</span><span class="p">:</span><span class="mi">10001</span><span class="p">,</span> |
| <span class="nt">"resetOffsetToEarliest"</span><span class="p">:</span><span class="s2">"true"</span><span class="p">,</span> |
| <span class="nt">"partitionIdList"</span> <span class="p">:</span> <span class="p">[</span><span class="s2">"0"</span><span class="p">],</span> |
| <span class="nt">"clientId"</span> <span class="p">:</span> <span class="s2">"localclient"</span><span class="p">,</span> |
| <span class="nt">"feed"</span><span class="p">:</span> <span class="s2">"wikipedia"</span> |
| <span class="p">}</span> |
| </code></pre></div> |
| <table><thead> |
| <tr> |
| <th>property</th> |
| <th>description</th> |
| <th>required?</th> |
| </tr> |
| </thead><tbody> |
| <tr> |
| <td>type</td> |
| <td>kafka-0.8-v2</td> |
| <td>yes</td> |
| </tr> |
| <tr> |
| <td>brokerList</td> |
| <td>list of the kafka brokers</td> |
| <td>yes</td> |
| </tr> |
| <tr> |
| <td>queueBufferLength</td> |
| <td>the buffer length for kafka message queue</td> |
| <td>no default(20000)</td> |
| </tr> |
| <tr> |
| <td>resetOffsetToEarliest</td> |
| <td>in case of kafkaOffsetOutOfRange error happens, consumer should starts from the earliest or latest message available</td> |
| <td>true</td> |
| </tr> |
| <tr> |
| <td>partitionIdList</td> |
| <td>list of kafka partition ids</td> |
| <td>yes</td> |
| </tr> |
| <tr> |
| <td>clientId</td> |
| <td>the clientId for kafka SimpleConsumer</td> |
| <td>yes</td> |
| </tr> |
| <tr> |
| <td>feed</td> |
| <td>kafka topic</td> |
| <td>yes</td> |
| </tr> |
| </tbody></table> |
| |
| <p>For using this firehose at scale and possibly in production, it is recommended to set replication factor to at least three, which means at least three Kafka brokers in the <code>brokerList</code>. For a 1*10^4 events per second kafka topic, keeping one partition can work properly, but more partitions could be added if higher throughput is required.</p> |
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