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4b80130b0b
There are some schema modifications performed automatically (during bootstrap, upgrade etc.) by Scylla that are announced by multiple calls to `migration_manager::announce` even though they are logically one change. Precisely, they appear in: - `system_distributed_keyspace::start`, - `redis:create_keyspace_if_not_exists_impl`, - `table_helper::setup_keyspace` (for the `system_traces` keyspace). All these places contain a FIXME telling us to `announce` only once. There are a few reasons for this: - calling `migration_manager::announce` with Raft is quite expensive -- taking a `read_barrier` is necessary, and that requires contacting a leader, which then must contact a quorum, - we must implement a retrying mechanism for every automatic `announce` if `group0_concurrent_modification` occurs to enable support for concurrent bootstrap in Raft-based topology. Doing it before the FIXMEs mentioned above would be harder, and fixing the FIXMEs later would also be harder. This PR fixes the first two FIXMEs and improves the situation with the last one by reducing the number of the `announce` calls to two. Unfortunately, reducing this number to one requires a big refactor. We can do it as a follow-up to a new, more specific issue. Also, we leave a new FIXME. Fixing the first two FIXMEs required enabling the announcement of a keyspace together with its tables. Until now, the code responsible for preparing mutations for a new table could assume the existence of the keyspace. This assumption wasn't necessary, but removing it required some refactoring. Fixes #15437 Closes scylladb/scylladb#15594 * github.com:scylladb/scylladb: table_helper: announce twice in setup_keyspace table_helper: refactor setup_table redis: create_keyspace_if_not_exists_impl: fix indentation redis: announce once in create_keyspace_if_not_exists_impl db: system_distributed_keyspace: fix indentation db: system_distributed_keyspace: announce once in start tablet_allocator: update on_before_create_column_family migration_listener: add parameter to on_before_create_column_family alternator: executor: use new prepare_new_column_family_announcement alternator: executor: introduce create_keyspace_metadata migration_manager: add new prepare_new_column_family_announcement