I'd say, "add new DC, then remove old DC" approach is more risky especially if they use QUORUM CL (in this case they will need to change CL to LOCAL_QUORUM, otherwise they'll run into a lot of blocking read repairs). Also, if there is a chance to get rid of streaming, it worth doing as usually direct data copy (not by means of C*) is more effective and less troublesome.
Regards, Kyrill ________________________________________ From: Nitan Kainth <nitankai...@gmail.com> Sent: Wednesday, February 21, 2018 1:04:05 AM To: user@cassandra.apache.org Subject: Re: Best approach to Replace existing 8 smaller nodes in production cluster with New 8 nodes that are bigger in capacity, without a downtime You can also create a new DC and then terminate old one. Sent from my iPhone > On Feb 20, 2018, at 2:49 PM, Kyrylo Lebediev <kyrylo_lebed...@epam.com> wrote: > > Hi, > Consider using this approach, replacing nodes one by one: > https://mrcalonso.com/2016/01/26/cassandra-instantaneous-in-place-node-replacement/ > > Regards, > Kyrill > > ________________________________________ > From: Leena Ghatpande <lghatpa...@hotmail.com> > Sent: Tuesday, February 20, 2018 10:24:24 PM > To: user@cassandra.apache.org > Subject: Best approach to Replace existing 8 smaller nodes in production > cluster with New 8 nodes that are bigger in capacity, without a downtime > > Best approach to replace existing 8 smaller 8 nodes in production cluster > with New 8 nodes that are bigger in capacity without a downtime > > We have 4 nodes each in 2 DC, and we want to replace these 8 nodes with new 8 > nodes that are bigger in capacity in terms of RAM,CPU and Diskspace without a > downtime. > The RF is set to 3 currently, and we have 2 large tables with upto 70Million > rows > > What would be the best approach to implement this > - Add 1 New Node and Decomission 1 Old node at a time? > - Add all New nodes to the cluster, and then decommission old nodes ? > If we do this, can we still keep the RF=3 while we have 16 nodes at a > point in the cluster before we start decommissioning? > - How long do we wait in between adding a Node or decomissiing to ensure > the process is complete before we proceed? > - Any tool that we can use to monitor if the add/decomission node is done > before we proceed to next > > Any other suggestion? > > > --------------------------------------------------------------------- > To unsubscribe, e-mail: user-unsubscr...@cassandra.apache.org > For additional commands, e-mail: user-h...@cassandra.apache.org > --------------------------------------------------------------------- To unsubscribe, e-mail: user-unsubscr...@cassandra.apache.org For additional commands, e-mail: user-h...@cassandra.apache.org --------------------------------------------------------------------- To unsubscribe, e-mail: user-unsubscr...@cassandra.apache.org For additional commands, e-mail: user-h...@cassandra.apache.org
