Hi Jean, This is a really good question.
As Erick mentioned, if you want to change your cluster's *num_tokens* to 16 to match the 4.0 default, you will need to perform a datacenter migration. Feel free to read over this blog post <https://thelastpickle.com/blog/2019/02/26/data-center-switch.html> written by The Last Pickle which will provide background details about the process. The information should follow the Apache website runbook (when published) fairly closely. Kind regards, On Sat, 4 Sept 2021 at 20:45, Jean Tremblay <jean.tremb...@gmail.com> wrote: > Great Thank you for the answer and the link! > > > On 4 Sep 2021, at 11:35, Erick Ramirez <erick.rami...@datastax.com> wrote: > > It isn't possible to change the tokens on a node once it is already part > of the cluster. Cassandra won't allow you to do it because it will make the > data already on disk unreadable. You'll need to either configure new nodes > or add a new DC. I've answered an identical question in > https://community.datastax.com/questions/12213/ where I've provided steps > for the 2 options. I hope to draft a runbook and get it published on the > Apache website in the coming days. Cheers! > > >
