It's still not recommended to start at the same time. Stagger by 2 minutes is what the following documentation suggests; along with additional steps. re. version 2.1
https://docs.datastax.com/en/cassandra/2.1/cassandra/operations/ops_add_node_to_cluster_t.html -- Jacob Shadix On Wed, Apr 12, 2017 at 1:48 PM, Vlad <qa23d-...@yahoo.com> wrote: > But it seems OK to add multiple nodes at once, right? > > > On Tuesday, April 11, 2017 8:38 PM, Jacob Shadix <jacobsha...@gmail.com> > wrote: > > > Right! Another reason why I just stick with sequential decommissions. > Maybe someone here could shed some light on what happens under the covers > if parallel decommissions are kicked off. > > -- Jacob Shadix > > On Tue, Apr 11, 2017 at 12:55 PM, benjamin roth <brs...@gmail.com> wrote: > > I did not test it but I'd bet that parallel decommision will lead to > inconsistencies. > Each decommission results in range movements and range reassignments which > becomes effective after a successful decommission. > If you start several decommissions at once, I guess the calculated > reassignments are invalid for at least one node after the first node > finished the decommission process. > > I hope someone will correct me if i am wrong. > > 2017-04-11 18:43 GMT+02:00 Jacob Shadix <jacobsha...@gmail.com>: > > Are you using vnodes? I typically do one-by-one as the decommission will > create additional load/network activity streaming data to the other nodes > as the token ranges are reassigned. > > -- Jacob Shadix > > On Sat, Apr 8, 2017 at 10:55 AM, Vlad <qa23d-...@yahoo.com> wrote: > > Hi, > > how multiple nodes should be decommissioned by "nodetool decommission"- > one by one or in parallel ? > > Thanks. > > > > > > >
