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e74a4b038f
This change supports changing replication factor in tablets-enabled keyspaces. This covers both increasing and decreasing the number of tablets replicas through first building topology mutations (`alter_keyspace_statement.cc`) and then tablets/topology/schema mutations (`topology_coordinator.cc`). For the limitations of the current solution, please see the docs changes attached to this PR. Fixes: #16129 Closes scylladb/scylladb#16723 * github.com:scylladb/scylladb: test: Do not check tablets mutations on nodes that don't have them test: Fix the way tablets RF-change test parses mutation_fragments test/tablets: Unmark RF-changing test with xfail docs: document ALTER KEYSPACE with tablets Return response only when tablets are reallocated cql-pytest: Verify RF is changes by at most 1 when tablets on cql3/alter_keyspace_statement: Do not allow for change of RF by more than 1 Reject ALTER with 'replication_factor' tag Implement ALTER tablets KEYSPACE statement support Parameterize migration_manager::announce by type to allow executing different raft commands Introduce TABLET_KEYSPACE event to differentiate processing path of a vnode vs tablets ks Extend system.topology with 3 new columns to store data required to process alter ks global topo req Allow query_processor to check if global topo queue is empty Introduce new global topo `keyspace_rf_change` req New raft cmd for both schema & topo changes Add storage service to query processor tablets: tests for adding/removing replicas tablet_allocator: make load_balancer_stats_manager configurable by name