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<h1 class="title">Gearpump Cluster Requirement</h1>
<h3 id="pre-requisite">Pre-requisite</h3>
<p>Gearpump cluster can be installed on Windows OS and Linux.</p>
<p>Before installation, you need to decide how many machines are used to run this cluster.</p>
<p>For each machine, the requirements are listed in table below.</p>
<p>** Table: Environment requirement on single machine**</p>
<table>
<thead>
<tr>
<th>Resource</th>
<th>Requirements</th>
</tr>
</thead>
<tbody>
<tr>
<td>Memory</td>
<td>2GB free memory is required to run the cluster. For any production system, 32GB memory is recommended.</td>
</tr>
<tr>
<td>Java</td>
<td>JRE 6 or above</td>
</tr>
<tr>
<td>User permission</td>
<td>Root permission is not required</td>
</tr>
<tr>
<td>Network Ethernet</td>
<td>(TCP/IP)</td>
</tr>
<tr>
<td>CPU</td>
<td>Nothing special</td>
</tr>
<tr>
<td>HDFS installation</td>
<td>Default is not required. You only need to install it when you want to store the application jars in HDFS.</td>
</tr>
<tr>
<td>Kafka installation</td>
<td>Default is not required. You need to install Kafka when you want the at-least once message delivery feature. Currently, the only supported data source for this feature is Kafka</td>
</tr>
</tbody>
</table>
<p>** Table: The default port used in Gearpump:**</p>
<table>
<thead>
<tr>
<th>usage</th>
<th>Port</th>
<th>Description</th>
</tr>
</thead>
<tbody>
<tr>
<td>Dashboard UI</td>
<td>8090</td>
<td>Web UI.</td>
</tr>
<tr>
<td>Dashboard web socket service</td>
<td>8091</td>
<td>UI backend web socket service for long connection.</td>
</tr>
<tr>
<td>Master port</td>
<td>3000</td>
<td>Every other role like worker, appmaster, executor, user use this port to communicate with Master.</td>
</tr>
</tbody>
</table>
<p>You need to ensure that your firewall has not banned these ports to ensure Gearpump can work correctly.
And you can modify the port configuration. Check <a href="deployment-configuration.html">Configuration</a> section for details.</p>
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