Thanks Eric. So do you advise copying tokens in such cases ? What procedure is advisable ?
Latency increased on target cluster. I’d double check on storage disks but it should be same. — Ankit On Thu, Feb 6, 2020 at 9:07 PM Erick Ramirez <flightc...@gmail.com> wrote: > I didn’t copy tokens since it’s an identical cluster and we have RF as 3 >> on 3 node cluster. Is it still needed , why? >> > > In C*, same number of nodes alone isn't enough. Clusters aren't really > identical unless token assignments are the same. In your case though since > each node has a full copy of the data (RF = N nodes), they "appear" > identical. > > I recently migrated Cassandra keyspace data from one Azure cluster (3 >> Nodes) to another (3 nodes different region) using simple sstable copy. >> Post this , we are observing overall response time has increased and >> timeouts every 20 mins. >> > > You mean the response time on the source cluster increased? Or the > destination cluster? I can't see how the copy could affect latency unless > you're using premium storage disks and you've maxed out the throughput on > them. For example, P30 disks are capped at 200MB/s. > > Do I need to copy anything from system* > > > No, system tables are local to a node. Only ever copy the application > keyspaces. Cheers! > -- *Thanks & Regards,* *Ankit Gadhiya*
