> > I want to have more than one seed node in each DC, so unless I don't > restart the node after changing the seed_list in that node it will not > become the seed.
That's not really going to hurt you if you have other seeds in other DCs. But if you're willing to take the hit from the restart then feel free to do so. Just saying that it's not necessary to do it immediately so the option is there for you. :) Do I need to update the seed_list across all the nodes even in separate DCs > and perform a rolling restart even across DCs or the restart should be > happening only on the new node that I want as a seed? You generally want to make the seeds list the same across all nodes in the cluster. You want to avoid the situation where lots of nodes are used as seeds by various nodes. Limiting the seeds to 2 per DC means that gossip convergence will happen much faster. Cheers! >
