| = cassandra-rackdc.properties file |
| |
| Several `snitch` options use the `cassandra-rackdc.properties` |
| configuration file to determine which `datacenters` 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: |
| |
| * GossipingPropertyFileSnitch |
| * AWS EC2 single-region snitch |
| * AWS EC2 multi-region snitch |
| |
| The GossipingPropertyFileSnitch is recommended for production. This |
| snitch uses the datacenter and rack information configured in a local |
| node's `cassandra-rackdc.properties` file and propagates the information |
| to other nodes using `gossip`. It is the default snitch and the settings |
| in this properties file are enabled. |
| |
| The AWS EC2 snitches are configured for clusters in AWS. This snitch |
| uses the `cassandra-rackdc.properties` options to designate one of two |
| AWS EC2 datacenter and rack naming conventions: |
| |
| * 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 "-". |
| + |
| ____ |
| Examples: us-west-1a => dc: us-west, rack: 1a; us-west-2b => dc: |
| us-west-2, rack: 2b; |
| ____ |
| * standard: Datacenter name is the standard AWS region name, including |
| the number. Rack name is the region plus the availability zone letter. |
| + |
| ____ |
| Examples: us-west-1a => dc: us-west-1, rack: us-west-1a; us-west-2b => |
| dc: us-west-2, rack: us-west-2b; |
| ____ |
| |
| Either snitch can set to use the local or internal IP address when |
| multiple datacenters are not communicating. |
| |
| == GossipingPropertyFileSnitch |
| |
| === `dc` |
| |
| Name of the datacenter. The value is case-sensitive. |
| |
| *Default value:* DC1 |
| |
| === `rack` |
| |
| Rack designation. The value is case-sensitive. |
| |
| *Default value:* RAC1 |
| |
| == AWS EC2 snitch |
| |
| === `ec2_naming_scheme` |
| |
| Datacenter and rack naming convention. Options are `legacy` or |
| `standard` (default). *This option is commented out by default.* |
| |
| *Default value:* standard |
| |
| [NOTE] |
| .Note |
| ==== |
| YOU MUST USE THE `legacy` VALUE IF YOU ARE UPGRADING A PRE-4.0 CLUSTER. |
| ==== |
| |
| == Either snitch |
| |
| === `prefer_local` |
| |
| Option to use the local or internal IP address when communication is not |
| across different datacenters. *This option is commented out by default.* |
| |
| *Default value:* true |
