Cassandra scales very easily, and with zero downtime. This is one of the reasons why it is chosen over many other contenders. The steps are pretty straightforward and simple:
You need to set up Cassandra on the nodes to be added. Don't start the Cassandra process yet; first, follow these steps:
Update the seed nodes in
Cassandra.yamlunderseed_provider.Make sure the
tmpfolders are clean.Add
auto_bootstraptoCassandra.yamland set it totrue.Update
cluster_nameinCassandra.yaml.Update
listen_address/broadcast_addressinCassandra.yaml.
Start all the new nodes one by one, pausing for at least 5 minutes between two consecutive starts.
Once the node is started, it will proclaim its share of data based on the token range it owns and start streaming that in. This could be verified using the
nodetoolnetstatcommand, as shown in the following code:mydomain@my-cass1:/home/ubuntu$ /usr/local/cassandra/apache- cassandra-1.1.6/bin/nodetool -h 10.3.12.29...