cassandra-topologies.properties file

The PropertyFileSnitch snitch option uses the cassandra-topologies.properties configuration file to determine which datacenters and racks cluster nodes belong to. If other snitches are used, the cassandra-rackdc.properties 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.

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.

The cassandra-topologies.properties file must be copied identically to every node in the cluster.

Example

This example uses three datacenters:

  1. # datacenter One
  3. 175.56.12.105=DC1:RAC1
  4. 175.50.13.200=DC1:RAC1
  5. 175.54.35.197=DC1:RAC1
  7. 120.53.24.101=DC1:RAC2
  8. 120.55.16.200=DC1:RAC2
  9. 120.57.102.103=DC1:RAC2
  11. # datacenter Two
  13. 110.56.12.120=DC2:RAC1
  14. 110.50.13.201=DC2:RAC1
  15. 110.54.35.184=DC2:RAC1
  17. 50.33.23.120=DC2:RAC2
  18. 50.45.14.220=DC2:RAC2
  19. 50.17.10.203=DC2:RAC2
  21. # datacenter Three
  23. 172.106.12.120=DC3:RAC1
  24. 172.106.12.121=DC3:RAC1
  25. 172.106.12.122=DC3:RAC1
  27. # default for unknown nodes
  28. default =DC3:RAC1