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643e69af89
This PR implements the storage part of the cluster features on raft functionality, as described in the "Cluster features on raft v2" doc. These changes will be useful for later PRs that will implement the remaining parts of the feature. Two new columns are added to `system.topology`: - `supported_features set<text>` is a new clustering column which holds the features that given node advertises as supported. It will be first initialized when the node joins the cluster, and then updated every time the node reboots and its supported features set changes. - `enabled_features set<text>` is a new static column which holds the features that are considered enabled by the cluster. Unlike in the current gossip-based implementation the features will not be enabled implicitly when all nodes support a feature, but rather via an explicit action of the topology coordinator. These columns are reflected in the `topology_state_machine` structure and are populated when the topology state is loaded. Appropriate methods are added to the `topology_mutation_builder` and `topology_node_mutation_builder` in order to allow setting/modifying those columns. During startup, nodes update their corresponding `supported_features` column to reflect their current feature set. For now it is done unconditionally, but in the future appropriate checks will be added which will prevent nodes from joining / starting their server for group 0 if they can't guarantee that they support all enabled features. Closes #14232 * github.com:scylladb/scylladb: storage_service: update supported cluster features in group0 on start storage_service: add methods for features to topology mutation builder storage_service: use explicit ::set overload instead of a template storage_service: reimplement mutation builder setters storage_service: introduce topology_mutation_builder_base topology_state_machine: include information about features system_keyspace: introduce deserialize_set_column db/system_keyspace: add storage for cluster features managed in group 0