Ec2Snitch

The location of the cassandra-rackdc.properties depends on the type of installation:

Installation Type Location

Package installations + Installer-Services installations

/etc/dse/cassandra/cassandra-rackdc.properties

Tarball installations + Installer-No Services

installation_location/resources/cassandra/conf/cassandra-rackdc.properties

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.

Was this helpful?

Give Feedback

How can we improve the documentation?

© 2024 DataStax | Privacy policy | Terms of use

Apache, Apache Cassandra, Cassandra, Apache Tomcat, Tomcat, Apache Lucene, Apache Solr, Apache Hadoop, Hadoop, Apache Pulsar, Pulsar, Apache Spark, Spark, Apache TinkerPop, TinkerPop, Apache Kafka and Kafka are either registered trademarks or trademarks of the Apache Software Foundation or its subsidiaries in Canada, the United States and/or other countries. Kubernetes is the registered trademark of the Linux Foundation.

General Inquiries: +1 (650) 389-6000, info@datastax.com