A note about Overseer, since the fact that we want to eventually remove it got mentioned twice in the node roles SIP email thread: in Solr 9 the Overseer is there by default, unchanged, but two config parameters allow to not use it for cluster state updates and collection API command executions (i.e. what the overseer does). Then it only serves some light features that got added over time (singleton event related).
So it’s already gone as “overseer” for whoever want it gone. This hasn’t been battle tested yet though (not that I know of at least), so caution needed. But this is unrelated to the node role thread (there has to be a way to deal with tagging a node as preferred overseer, using existing or new mechanism), just thought I’d mention this. Ilan
