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| <p>To support HA, we allow to start master on multiple nodes. They will form a quorum to decide consistency. For example, if we start master on 5 nodes and 2 nodes are down, then the cluster is still consistent and functional.</p> |
| <p>Here are the steps to enable the HA mode:</p> |
| <h3 id="1-configure">1. Configure.</h3> |
| <h4 id="select-master-machines">Select master machines</h4> |
| <p>Distribute the package to all nodes. Modify <code>conf/gear.conf</code> on all nodes. You MUST configure</p> |
| <pre class="codehilite"><code class="language-bash">gearpump.hostname</code></pre> |
| |
| |
| <p>to make it point to your hostname(or ip), and</p> |
| <pre class="codehilite"><code class="language-bash">gearpump.cluster.masters</code></pre> |
| |
| |
| <p>to a list of master nodes. For example, if I have 3 master nodes (node1, node2, and node3), then the <code>gearpump.cluster.masters</code> can be set as</p> |
| <pre class="codehilite"><code class="language-bash">gearpump.cluster { |
| masters = ["node1:3000", "node2:3000", "node3:3000"] |
| }</code></pre> |
| |
| |
| <h4 id="configure-distributed-storage-to-store-application-jars">Configure distributed storage to store application jars.</h4> |
| <p>In <code>conf/gear.conf</code>, For entry <code>gearpump.jarstore.rootpath</code>, please choose the storage folder for application jars. You need to make sure this jar storage is highly available. We support two storage systems:</p> |
| <p>1). HDFS</p> |
| <p>You need to configure the <code>gearpump.jarstore.rootpath</code> like this</p> |
| <pre class="codehilite"><code class="language-bash">hdfs://host:port/path/</code></pre> |
| |
| |
| <p>For HDFS HA,</p> |
| <pre class="codehilite"><code class="language-bash"></code></pre> |
| |
| |
| <p>hdfs://namespace/path/</p> |
| <p>2). Shared NFS folder</p> |
| <p>First you need to map the NFS directory to local directory(same path) on all machines of master nodes. |
| Then you need to set the <code>gearpump.jarstore.rootpath</code> like this:</p> |
| <pre class="codehilite"><code class="language-bash">file:///your_nfs_mapping_directory</code></pre> |
| |
| |
| <p>3). If you don't set this value, we will use the local directory of master node. |
| NOTE! There is no HA guarantee in this case, which means we are unable to recover running applications when master goes down.</p> |
| <h3 id="2-start-daemon">2. Start Daemon.</h3> |
| <p>On node1, node2, node3, Start Master</p> |
| <pre class="codehilite"><code class="language-bash">## on node1 |
| bin/master -ip node1 -port 3000 |
| |
| ## on node2 |
| bin/master -ip node2 -port 3000 |
| |
| ## on node3 |
| bin/master -ip node3 -port 3000</code></pre> |
| |
| |
| <h3 id="3-done">3. Done!</h3> |
| <p>Now you have a highly available HA cluster. You can kill any node, the master HA will take effect.</p> |
| <p><strong>NOTE</strong>: It can take up to 15 seconds for master node to fail-over. You can change the fail-over timeout time by adding config in <code>gear.conf</code> <code>gearpump-master.akka.cluster.auto-down-unreachable-after=10s</code> or set it to a smaller value</p> |
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