Initializing a multiple node cluster (multiple datacenters)

This example describes installing a six node cluster spanning two datacenters. Each node is configured to use the GossipingPropertyFileSnitch (multiple rack aware) and 256 virtual nodes (vnodes).

In Cassandra, "datacenter" is synonymous with "replication group". Both terms refer to a set of nodes configured as a group for replication purposes.

ubuntu-c-4-8gib-blr1-01             159.65.157.45 (seed1)
cassandra_cluster_monitoring_001    34.227.26.121
cassandra_cluster_monitoring_002    34.239.132.58
cassandra_cluster_monitoring_003    34.226.139.41 (seed2)
cassandra_cluster_monitoring_004    52.90.90.172

Stop the service and clear the data

Doing this removes the default cluster_name (Test Cluster) from the system table. All nodes must use the same cluster name.

sudo service cassandra stop
sudo rm -rf /var/lib/cassandra/data/system/*

Set the properties in the cassandra.yaml file for each node

sudo vim /etc/cassandra/cassandra.yaml

cluster_name: 'MyCassandraCluster'

seed_provider:
  - class_name: org.apache.cassandra.locator.SimpleSeedProvider
    parameters:
        - seeds: "159.65.157.45,34.226.139.41"

listen_address: private_ip
broadcast_address: public_ip
rpc_address: public_ip

endpoint_snitch: GossipingPropertyFileSnitch

Note: Include at least one node from each datacenter in the seeds list.

Assign the datacenter and rack names in cassandra-rackdc.properties

sudo vim /etc/cassandra/cassandra-rackdc.properties

Nodes 0 to 2

dc=DC1
rack=RAC1

Nodes 3 to 4

dc=DC2
rack=RAC1

Remove cassandra-topology.properties from each node

The GossipingPropertyFileSnitch always loads cassandra-topology.properties when that file is present. Remove the file from each node on any new cluster or any cluster migrated from the PropertyFileSnitch

sudo rm /etc/cassandra/cassandra-topology.properties

Start Cassandra on the nodes

DataStax recommends starting the seed nodes one at a time, and then starting the rest of the nodes

sudo service cassandra start

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