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| <div class="section" id="cassandra-rackdc-properties-file"> |
| <span id="cassandra-rackdc"></span><h1>cassandra-rackdc.properties file<a class="headerlink" href="#cassandra-rackdc-properties-file" title="Permalink to this headline">¶</a></h1> |
| <p>Several <span class="xref std std-term">snitch</span> options use the <code class="docutils literal notranslate"><span class="pre">cassandra-rackdc.properties</span></code> configuration file to determine which <span class="xref std std-term">datacenters</span> and racks cluster nodes belong to. Information about the |
| network topology allows requests to be routed efficiently and to distribute replicas evenly. The following snitches can be configured here:</p> |
| <ul class="simple"> |
| <li>GossipingPropertyFileSnitch</li> |
| <li>AWS EC2 single-region snitch</li> |
| <li>AWS EC2 multi-region snitch</li> |
| </ul> |
| <p>The GossipingPropertyFileSnitch is recommended for production. This snitch uses the datacenter and rack information configured in a local node’s <code class="docutils literal notranslate"><span class="pre">cassandra-rackdc.properties</span></code> |
| file and propagates the information to other nodes using <span class="xref std std-term">gossip</span>. It is the default snitch and the settings in this properties file are enabled.</p> |
| <p>The AWS EC2 snitches are configured for clusters in AWS. This snitch uses the <code class="docutils literal notranslate"><span class="pre">cassandra-rackdc.properties</span></code> options to designate one of two AWS EC2 datacenter and rack naming conventions:</p> |
| <ul> |
| <li><p class="first">legacy: Datacenter name is the part of the availability zone name preceding the last “-” when the zone ends in -1 and includes the number if not -1. Rack name is the portion of the availability zone name following the last “-“.</p> |
| <blockquote> |
| <div><p>Examples: us-west-1a => dc: us-west, rack: 1a; us-west-2b => dc: us-west-2, rack: 2b;</p> |
| </div></blockquote> |
| </li> |
| <li><p class="first">standard: Datacenter name is the standard AWS region name, including the number. Rack name is the region plus the availability zone letter.</p> |
| <blockquote> |
| <div><p>Examples: us-west-1a => dc: us-west-1, rack: us-west-1a; us-west-2b => dc: us-west-2, rack: us-west-2b;</p> |
| </div></blockquote> |
| </li> |
| </ul> |
| <p>Either snitch can set to use the local or internal IP address when multiple datacenters are not communicating.</p> |
| <div class="section" id="gossipingpropertyfilesnitch"> |
| <h2>GossipingPropertyFileSnitch<a class="headerlink" href="#gossipingpropertyfilesnitch" title="Permalink to this headline">¶</a></h2> |
| <div class="section" id="dc"> |
| <h3><code class="docutils literal notranslate"><span class="pre">dc</span></code><a class="headerlink" href="#dc" title="Permalink to this headline">¶</a></h3> |
| <p>Name of the datacenter. The value is case-sensitive.</p> |
| <p><strong>Default value:</strong> DC1</p> |
| </div> |
| <div class="section" id="rack"> |
| <h3><code class="docutils literal notranslate"><span class="pre">rack</span></code><a class="headerlink" href="#rack" title="Permalink to this headline">¶</a></h3> |
| <p>Rack designation. The value is case-sensitive.</p> |
| <p><strong>Default value:</strong> RAC1</p> |
| </div> |
| </div> |
| <div class="section" id="aws-ec2-snitch"> |
| <h2>AWS EC2 snitch<a class="headerlink" href="#aws-ec2-snitch" title="Permalink to this headline">¶</a></h2> |
| <div class="section" id="ec2-naming-scheme"> |
| <h3><code class="docutils literal notranslate"><span class="pre">ec2_naming_scheme</span></code><a class="headerlink" href="#ec2-naming-scheme" title="Permalink to this headline">¶</a></h3> |
| <p>Datacenter and rack naming convention. Options are <code class="docutils literal notranslate"><span class="pre">legacy</span></code> or <code class="docutils literal notranslate"><span class="pre">standard</span></code> (default). <strong>This option is commented out by default.</strong></p> |
| <p><strong>Default value:</strong> standard</p> |
| <div class="admonition note"> |
| <p class="first admonition-title">Note</p> |
| <p class="last">YOU MUST USE THE <code class="docutils literal notranslate"><span class="pre">legacy</span></code> VALUE IF YOU ARE UPGRADING A PRE-4.0 CLUSTER.</p> |
| </div> |
| </div> |
| </div> |
| <div class="section" id="either-snitch"> |
| <h2>Either snitch<a class="headerlink" href="#either-snitch" title="Permalink to this headline">¶</a></h2> |
| <div class="section" id="prefer-local"> |
| <h3><code class="docutils literal notranslate"><span class="pre">prefer_local</span></code><a class="headerlink" href="#prefer-local" title="Permalink to this headline">¶</a></h3> |
| <p>Option to use the local or internal IP address when communication is not across different datacenters. <strong>This option is commented out by default.</strong></p> |
| <p><strong>Default value:</strong> true</p> |
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