Over the past year we've migrated several clusters from DSE to Apache Cassandra. We've mostly done I place conversions node by node with no downtime. DSE 4.8.X to Apache Cassandra 2.1.x
On Wed, May 29, 2019 at 8:55 PM Goetz, Anthony <anthony_goe...@comcast.com> wrote: > My team migrated from DSE to OSS a few years ago by doing datacenter > switch. You will need to update replication strategy for all keyspaces > that are using Everywhere to NetworkTopologyStrategy before adding any OSS > nodes. As Jonathan mentioned, DSE nodes will revert this change on > restart. To account for this, we modified our init script to call a cql > script that would make sure the keyspaces were set back to > NetworkTopologyStrategy. > > > > High Level Plan: > > - Find DSE Cassandra binary version > - Review config to make sure you are not using any DSE specific > settings > - Update replication strategy on keyspaces using Everywhere to > NetworkTopologyStrategy > - Add OSS DC using same binary version as DSE > - Migrate clients to new OSS DC > - Decommission DSE DC > > > > Note: OpsCenter will stop working once you add OSS nodes. > > > > *From: *Jonathan Koppenhofer <j...@koppedomain.com> > *Reply-To: *Cassandra User List <user@cassandra.apache.org> > *Date: *Wednesday, May 29, 2019 at 6:45 PM > *To: *Cassandra User List <user@cassandra.apache.org> > *Subject: *[EXTERNAL] Re: Sstableloader > > > > Has anyone tried to do a DC switch as a means to migrate from Datastax to > OSS? This would be the safest route as the ability to revert back to > Datastax is easy. However, I'm curious how the dse_system keyspace would be > replicated to OSS using their custom Everywhere strategy. You may have to > change the to Network topology strategy before firing up OSS nodes. Also, > keep in mind if you restart any DSE nodes, it will revert that keyspace > back to EverywhereStrategy. > > > > I also posted a means to migrate in place on this mailing list a few > months back (thanks for help from others on the mailing list), but it is a > little more involved and risky. Let me know if you can't find it, and I'll > dig it up. > > > > Finally, DSE 5.0 is open source equivalent 3.0.x. recommend you go to OSS > 3.0 then up to 3.11. > > On Wed, May 29, 2019, 5:56 PM Nitan Kainth <nitankai...@gmail.com> wrote: > > If cassandra version is same, it should work > > > > Regards, > > Nitan > > Cell: 510 449 9629 > > > On May 28, 2019, at 4:21 PM, Rahul Reddy <rahulreddy1...@gmail.com> wrote: > > Hello, > > > > Does sstableloader works between datastax and Apache cassandra. I'm trying > to migrate dse 5.0.7 to Apache 3.11.1 ? > >
