Ec2Snitch
The location of the cassandra-rackdc.properties depends on the type of installation:
| Installation Type | Location |
|---|---|
Package installations + Installer-Services installations |
|
Tarball installations + Installer-No Services |
|
Use the Ec2Snitch for simple cluster deployments on Amazon EC2 where all nodes in the cluster are within a single region.
In EC2 deployments, the region name is treated as the datacenter name and availability zones are treated as racks within a datacenter.
For example, if a node is in the us-east-1 region, us-east is the datacenter name and 1 is the rack location.
(Racks are important for distributing replicas, but not for datacenter naming.) Because private IPs are used, this snitch does not work across multiple regions.
If you are using only a single datacenter, you do not need to specify any properties.
If you need multiple datacenters, set the dc_suffix options in the cassandra-rackdc.properties file.
Any other lines are ignored.
For example, for each node within the us-eastregion, specify the datacenter in its cassandra-rackdc.properties file:
|
Datacenter names are case-sensitive. |
-
node0
dc_suffix=_1_cassandra -
node1
dc_suffix=_1_cassandra -
node2
dc_suffix=_1_cassandra -
node3
dc_suffix=_1_cassandra -
node4
dc_suffix=_1_analytics -
node5
dc_suffix=_1_search
This results in three datacenters for the region:
us-east_1_cassandra
us-east_1_analytics
us-east_1_search|
The datacenter naming convention in this example is based on the workload. You can use other conventions, such as DC1, DC2 or 100, 200. |
Keyspace strategy options
When defining your keyspace strategy options, use the EC2 region name, such as us-east, as your datacenter name.
