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f23f8f81bf
This patch introduces raft-based service levels. The difference to the current method of working is: - service levels are stored in `system.service_levels_v2` - reads are executed with `LOCAL_ONE` - writes are done via raft group0 operation Service levels are migrated to v2 in topology upgrade. After the service levels are migrated, `key: service_level_v2_status; value: data_migrated` is written to `system.scylla_local` table. If this row is present, raft data accessor is created from the beginning and it handles recovery mode procedure (service levels will be read from v2 table even if consistent topology is disabled then) Fixes #17926 Closes scylladb/scylladb#16585 * github.com:scylladb/scylladb: test: test service levels v2 works in recovery mode test: add test for service levels migration test: add test for service levels snapshot test:topology: extract `trigger_snapshot` to utils main: create raft dda if sl data was migrated service:qos: store information about sl data migration service:qos: service levels migration main: assign standard service level DDA before starting group0 service:qos: fix `is_v2()` method service:qos: add a method to upgrade data accessor test: add unit_test_raft_service_levels_accessor service:storage_service: add support for service levels raft snapshot service:qos: add abort_source for group0 operations service:qos: raft service level distributed data accessor service:qos: use group0_guard in data accessor cql3:statements: run service level statements on shard0 with raft guard test: fix overrides in unit_test_service_levels_accessor service:qos: fix indentation service:qos: coroutinize some of the methods db:system_keyspace: add `SERVICE_LEVELS_V2` table service:qos: extract common service levels' table functions