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e2f03e4aba
Currently all management of CDC generations happens in storage_service, which is a big ball of mud that does many unrelated things. Previous commits have introduced a new service for managing CDC generations. This code moves most of the relevant code to this new service. However, some part still remains in storage_service: the bootstrap procedure, which happens inside storage_service, must also do some initialization regarding CDC generations, for example: on restart it must retrieve the latest known generation timestamp from disk; on bootstrap it must create a new generation and announce it to other nodes. The order of these operations w.r.t the rest of the startup procedure is important, hence the startup procedure is the only right place for them. Still, what remains in storage_service is a small part of the entire CDC generation management logic; most of it has been moved to the new service. This includes listening for generation changes and updating the data structures for performing CDC log writes (cdc::metadata). Furthermore these functions now return futures (and are internally coroutines), where previously they required a seastar::async context.