How is replication handled in a DMS Cassandra cluster spanning regional data centers; synchronously or asynchronously ?
Marieke Goethals [SLC] [DevOps Catalyst] Selected answer as best 18th July 2023
Hi Wale,
You will need to configure the cassandra-topologies.properties file (used by the snitch) to provide information towards Cassandra on the setup. Once Cassandra is aware of the network topology you can configure your keyspaces to make use of the NetworkTopologyStrategy. With this strategy, you can configure a different replication factor on the different datacenters.
Let me know if you have additional questions.
Marieke Goethals [SLC] [DevOps Catalyst] Selected answer as best 18th July 2023
Hi Michiel,
For sake of completeness I would like to point out that in case you design a multi datacenter cluster in Cassandra, its highly recommended to switch to a different snitch –> GossipingPropertyFileSnitch instead of the SimpleSnitch. When making use of the GossipingPropertyFileSnitch it will read out the datacenter topology information from a different properties file –> cassandra-rackdc.properties file.
More information on this can be found on the datastax website:
https://docs.datastax.com/en/cassandra-oss/3.0/cassandra/architecture/archsnitchGossipPF.html