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| <div class="section" id="cassandra-topologies-properties-file"> |
| <span id="cassandra-topology"></span><h1>cassandra-topologies.properties file<a class="headerlink" href="#cassandra-topologies-properties-file" title="Permalink to this headline">¶</a></h1> |
| <p>The <code class="docutils literal notranslate"><span class="pre">PropertyFileSnitch</span></code> <span class="xref std std-term">snitch</span> option uses the <code class="docutils literal notranslate"><span class="pre">cassandra-topologies.properties</span></code> configuration file to determine which <span class="xref std std-term">datacenters</span> and racks cluster nodes belong to. If other snitches are used, the |
| :ref:cassandra_rackdc must be used. The snitch determines network topology (proximity by rack and datacenter) so that requests are routed efficiently and allows the database to distribute replicas evenly.</p> |
| <p>Include every node in the cluster in the properties file, defining your datacenter names as in the keyspace definition. The datacenter and rack names are case-sensitive.</p> |
| <p>The <code class="docutils literal notranslate"><span class="pre">cassandra-topologies.properties</span></code> file must be copied identically to every node in the cluster.</p> |
| <div class="section" id="example"> |
| <h2>Example<a class="headerlink" href="#example" title="Permalink to this headline">¶</a></h2> |
| <p>This example uses three datacenters:</p> |
| <div class="highlight-bash notranslate"><div class="highlight"><pre><span></span><span class="c1"># datacenter One</span> |
| |
| <span class="m">175</span>.56.12.105<span class="o">=</span>DC1:RAC1 |
| <span class="m">175</span>.50.13.200<span class="o">=</span>DC1:RAC1 |
| <span class="m">175</span>.54.35.197<span class="o">=</span>DC1:RAC1 |
| |
| <span class="m">120</span>.53.24.101<span class="o">=</span>DC1:RAC2 |
| <span class="m">120</span>.55.16.200<span class="o">=</span>DC1:RAC2 |
| <span class="m">120</span>.57.102.103<span class="o">=</span>DC1:RAC2 |
| |
| <span class="c1"># datacenter Two</span> |
| |
| <span class="m">110</span>.56.12.120<span class="o">=</span>DC2:RAC1 |
| <span class="m">110</span>.50.13.201<span class="o">=</span>DC2:RAC1 |
| <span class="m">110</span>.54.35.184<span class="o">=</span>DC2:RAC1 |
| |
| <span class="m">50</span>.33.23.120<span class="o">=</span>DC2:RAC2 |
| <span class="m">50</span>.45.14.220<span class="o">=</span>DC2:RAC2 |
| <span class="m">50</span>.17.10.203<span class="o">=</span>DC2:RAC2 |
| |
| <span class="c1"># datacenter Three</span> |
| |
| <span class="m">172</span>.106.12.120<span class="o">=</span>DC3:RAC1 |
| <span class="m">172</span>.106.12.121<span class="o">=</span>DC3:RAC1 |
| <span class="m">172</span>.106.12.122<span class="o">=</span>DC3:RAC1 |
| |
| <span class="c1"># default for unknown nodes</span> |
| <span class="nv">default</span> <span class="o">=</span>DC3:RAC1 |
| </pre></div> |
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