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| <h2 id="how-to-deploy-for-at-least-once-message-delivery">How to deploy for At Least Once Message Delivery?</h2> |
| <p>As introduced in the <a href="../../introduction/message-delivery#what-is-at-least-once-message-delivery">What is At Least Once Message Delivery</a>, Gearpump has a built in KafkaSource. To get at least once message delivery, users should deploy a Kafka cluster as the offset store along with the Gearpump cluster. </p> |
| <p>Here's an example to deploy a local Kafka cluster. </p> |
| <ol> |
| <li> |
| <p>download the latest Kafka from the official website and extract to a local directory (<code>$KAFKA_HOME</code>)</p> |
| </li> |
| <li> |
| <p>Boot up the single-node Zookeeper instance packaged with Kafka. </p> |
| <pre class="codehilite"><code class="language-bash">$KAFKA_HOME/bin/zookeeper-server-start.sh $KAFKA_HOME/config/zookeeper.properties</code></pre> |
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| <p>Start a Kafka broker</p> |
| <pre class="codehilite"><code class="language-bash">$KAFKA_HOME/bin/kafka-server-start.sh $KAFKA_HOME/config/kafka.properties</code></pre> |
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| <p>When creating a offset store for <code>KafkaSource</code>, set the zookeeper connect string to <code>localhost:2181</code> and broker list to <code>localhost:9092</code> in <code>KafkaStorageFactory</code>.</p> |
| <pre class="codehilite"><code class="language-scala">val offsetStorageFactory = new KafkaStorageFactory("localhost:2181", "localhost:9092") |
| val source = new KafkaSource("topic1", "localhost:2181", offsetStorageFactory)</code></pre> |
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| </ol> |
| <h2 id="how-to-deploy-for-exactly-once-message-delivery">How to deploy for Exactly Once Message Delivery?</h2> |
| <p>Exactly Once Message Delivery requires both an offset store and a checkpoint store. For the offset store, a Kafka cluster should be deployed as in the previous section. As for the checkpoint store, Gearpump has built-in support for Hadoop file systems, like HDFS. Hence, users should deploy a HDFS cluster alongside the Gearpump cluster. </p> |
| <p>Here's an example to deploy a local HDFS cluster.</p> |
| <ol> |
| <li> |
| <p>download Hadoop 2.6 from the official website and extracts it to a local directory <code>HADOOP_HOME</code></p> |
| </li> |
| <li> |
| <p>add following configuration to <code>$HADOOP_HOME/etc/core-site.xml</code></p> |
| <pre class="codehilite"><code class="language-xml"><configuration> |
| <property> |
| <name>fs.defaultFS</name> |
| <value>hdfs://localhost:9000</value> |
| </property> |
| </configuration></code></pre> |
| |
| |
| </li> |
| <li> |
| <p>start HDFS</p> |
| <pre class="codehilite"><code class="language-bash">$HADOOP_HOME/sbin/start-dfs.sh</code></pre> |
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| </li> |
| <li> |
| <p>When creating a <code>HadoopCheckpointStore</code>, set the hadoop configuration as in the <code>core-site.xml</code></p> |
| <pre class="codehilite"><code class="language-scala">val hadoopConfig = new Configuration |
| hadoopConfig.set("fs.defaultFS", "hdfs://localhost:9000") |
| val checkpointStoreFactory = new HadoopCheckpointStoreFactory("MessageCount", hadoopConfig, new FileSizeRotation(1000))</code></pre> |
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