mirror of https://github.com/apache/cassandra
49 lines
1.4 KiB
ReStructuredText
49 lines
1.4 KiB
ReStructuredText
.. _cassandra-topology:
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cassandra-topologies.properties file
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================================
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The ``PropertyFileSnitch`` :term:`snitch` option uses the ``cassandra-topologies.properties`` configuration file to determine which :term:`datacenters` and racks cluster nodes belong to. If other snitches are used, the
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: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.
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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.
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The ``cassandra-topologies.properties`` file must be copied identically to every node in the cluster.
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===========================
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Example
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===========================
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This example uses three datacenters:
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.. code-block:: bash
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# datacenter One
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175.56.12.105=DC1:RAC1
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175.50.13.200=DC1:RAC1
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175.54.35.197=DC1:RAC1
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120.53.24.101=DC1:RAC2
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120.55.16.200=DC1:RAC2
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120.57.102.103=DC1:RAC2
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# datacenter Two
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110.56.12.120=DC2:RAC1
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110.50.13.201=DC2:RAC1
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110.54.35.184=DC2:RAC1
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50.33.23.120=DC2:RAC2
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50.45.14.220=DC2:RAC2
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50.17.10.203=DC2:RAC2
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# datacenter Three
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172.106.12.120=DC3:RAC1
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172.106.12.121=DC3:RAC1
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172.106.12.122=DC3:RAC1
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# default for unknown nodes
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default =DC3:RAC1
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