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This change is preparing ground for state update unification for raft bound subsystems. It introduces schema_applier which in the future will become generic interface for applying mutations in raft. Pulling database::apply() out of schema merging code will allow to batch changes to subsystems. Future generic code will first call prepare() on all implementations, then single database::apply() and then update() on all implementations, then on each shard it will call commit() for all implementations, without preemption so that the change is observed as atomic across all subsystems, and then post_commit(). Backport: no, it's a new feature Fixes: https://github.com/scylladb/scylladb/issues/19649 Fixes https://github.com/scylladb/scylladb/issues/24531 Closes scylladb/scylladb#24886 [avi: adjust for std::vector<mutations> -> utils::chunked_vector<mutations>] * github.com:scylladb/scylladb: test: add type creation to test_snapshot storage_service: always wake up load balancer on update tablet metadata db: schema_applier: call destroy also when exception occurs db: replica: simplify seeding ERM during shema change db: remove cleanup from add_column_family db: abort on exception during schema commit phase db: make user defined types changes atomic replica: db: make keyspace schema changes atomic db: atomically apply changes to tables and views replica: make truncate_table_on_all_shards get whole schema from table_shards service: split update_tablet_metadata into two phases service: pull out update_tablet_metadata from migration_listener db: service: add store_service dependency to schema_applier service: simplify load_tablet_metadata and update_tablet_metadata db: don't perform move on tablet_hint reference replica: split add_column_family_and_make_directory into steps replica: db: split drop_table into steps db: don't move map references in merge_tables_and_views() db: introduce commit_on_shard function db: access types during schema merge via special storage replica: make non-preemptive keyspace create/update/delete functions public replica: split update keyspace into two phases replica: split creating keyspace into two functions db: rename create_keyspace_from_schema_partition db: decouple functions and aggregates schema change notification from merging code db: store functions and aggregates change batch in schema_applier db: decouple tables and views schema change notifications from merging code db: store tables and views schema diff in schema_applier db: decouple user type schema change notifications from types merging code service: unify keyspace notification functions arguments db: replica: decouple keyspace schema change notifications to a separate function db: add class encapsulating schema merging