Because ALTER KS will result in creating a global topo req, we'll have to pass the req data to topology coordinator's state machine, and the easiest way to do it is through sytem.topology table, which is going to be extended with 3 extra columns carrying all the data required to execute ALTER KS from within topology coordinator.
Scylla developer documentation
This folder contains developer-oriented documentation concerning the ScyllaDB codebase. We also have a wiki, which contains additional developer-oriented documentation. There is currently no clear definition of what goes where, so when looking for something be sure to check both.
Seastar documentation can be found here.
User documentation can be found on docs.scylladb.com
For information on how to build Scylla and how to contribute visit HACKING.md and CONTRIBUTING.md.