> Today I need to bring that data center back in. It is not 2-3 days out dated. > I have two options: > > 1) Treat this as a new data center and let the nodes sync from scratch, or > 2) Bring the nodes back up with all the data in place and do a repair. As long as the nodes were down for less than gc_grace_seconds i would bring the old ones back with their data and run repair.
If possible avoid having the application read from them until it’s complete. > There are 4 nodes in both data centers, with RF=2. I’d recommend moving to RF 3 if you use QUORUM. Cheers ----------------- Aaron Morton New Zealand @aaronmorton Co-Founder & Principal Consultant Apache Cassandra Consulting http://www.thelastpickle.com On 26/10/2013, at 2:33 am, Oleg Dulin <oleg.du...@gmail.com> wrote: > I am using Cassandra 1.1.11 and plan on upgrading soon, but in the meantime > here is what happened. > > I couldn't run repairs because of a slow WAN pipe, so i removed the second > data center from the cluster. > > Today I need to bring that data center back in. It is not 2-3 days out dated. > I have two options: > > 1) Treat this as a new data center and let the nodes sync from scratch, or > 2) Bring the nodes back up with all the data in place and do a repair. > > We are talking about 30-40Gigs per node. There are 4 nodes in both data > centers, with RF=2. > > > -- > Regards, > Oleg Dulin > http://www.olegdulin.com > >
