Posted: 3 Jan 2019 4:50 EST Last activity: 7 Feb 2019 10:00 EST
Cassandra - Multi Data Center configurations
Does 7.3.1 supports multi data center configurations or is it feasible only in 7.4 and later versions.
Also, is it feasible to manually configure the changes in 7.3.1 environment to support dual/multi data centers (or) functional changes are also required that are only present in 7.4 environment or later.
We have gone through below link and it says few of the multi data center issues are fixed in 7.4 version.
Please see responses below from the Decisioning product team.
Does 7.3.1 supports multi data center configurations
Yes, with Hfix-41762 (Notes on adding a second DSM center have previously bee shared with you)
Without DC awareness, is it feasible to do node repair
— not sure what is the question about, I'd say yes —
What is the Consistency level to be configured
By default Pega use consistency level ONE, there is no need to modify it.
Is it always required to define multiple racks?
If we have replication factor as 3 and we have multiple data centres, what is the Replication factor that we need to configure on each data centre?
When replication factor is set to 3 and instruction above is followed, it is set to 3 for each datacenter. If one needs to restrict a keyspace to only one datacenter, it can be set using prconfig: dnode/cassandra_local_datacenter_keyspaces. In 7.3.1 by default only ADM keyspace is set as local.