Yes, two per DC is a recommendation I've heard from Jonathan Ellis. We put that in yet more documentation athttp://www.datastax.com/dev/tutorials/getting_started_0.7/configuring#seed-list(appreciate the citation Aaron :)
I had a recent conversation with a Cassandra expert who had me convinced that, as long as a node online already had one seed in its list at startup, you wouldn't really need to restart it -- at least right away -- after adding a second seed to the config. Rather than confuse the issue by trying to remember/recreate the rationale for that, I'll ping him and see if he'll comment here. On Tue, Mar 1, 2011 at 12:04 PM, Aaron Morton <aa...@thelastpickle.com>wrote: > AFAIK it's recommended to have two seed nodes per dc. > > Some info on seeds here > <http://www.datastax.com/docs/0.7/operations/clustering> > http://www.datastax.com/docs/0.7/operations/clustering > > You will need a restart. > > Aaron > > > On 2/03/2011, at 6:08 AM, shan...@accenture.com wrote: > > How many seed nodes should I have for a cluster of 100 nodes each with > about 500gb of data? Also to add seeds the nodes, must I change the seed > nodes list on all existing nodes through the Cassandra.yaml file? Will > changes take effect without restarting the node? > > > > *Shan (Susie) Lu, *Analyst** > > Accenture Technology Labs - Silicon Valley ** > > cell +1 425.749.2546 > > email *shan...@accenture.com <charles.nebol...@accenture.com>* > > > > ------------------------------ > This message is for the designated recipient only and may contain > privileged, proprietary, or otherwise private information. If you have > received it in error, please notify the sender immediately and delete the > original. Any other use of the email by you is prohibited. > >
