Adding Data Center in Cassandra cluster

Adding Data center:


1) Know how the application is writing/reading. In the sense if it is quorum set to local_quorum or each_quorum

- Datastax Driver - set to DCAwareRoundRobinPolicy

2) If cassandra is started on new nodes, stop it and remove the data, log, saved cache , commit log files.

3) Cassandra.yaml

- auto_bootstrap: false

- -seeds

- endpoint snitch

- listen address

- rpc address

- num tokens

4) Update relevant property file snitch

- cassandra rackdc properties file

5) start now cassandra

6) After all nodes start in the Datacenter

- Set replication factor of keyspace to dc name and number of replicas needed

- Run nodetool rebuild specifying the existing datacenter on all nodes in the new datacenter

- Change to true or remove auto_bootstrap: false in the cassandra.yaml file


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7) We need to update the seed node on all nodes and do a restart

8) nohup nodetool rebuild -dc India_dc1 -ks bypramod >> /tmp/$(date +%Y-%m-%d)_`hostname -i`rebuild.log 2>&1 &

9) remove auto_bootstrap and restart the service on new dc.

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