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After this series, tablet replication can handle the scenario of bootstrapping new nodes. The ownership is distributed indirectly by the means of a load-balancer which moves tablets around in the background. See docs/dev/topology-over-raft.md for details. The implementation is by no means meant to be perfect, especially in terms of performance, and will be improved incrementally. The load balancer will be also kicked by schema changes, so that allocation/deallocation done during table creation/drop will be rebalanced. Tablet data is streamed using existing `range_streamer`, which is the infrastructure for "the old streaming". This will be later replaced by sstable transfer once integration of tablets with compaction groups is finished. Also, cleanup is not wired yet, also blocked by compaction group integration. Closes #14601 * github.com:scylladb/scylladb: tests: test_tablets: Add test for bootstraping a node storage_service: topology_coordinator: Implement tablet migration state machine tablets: Introduce tablet_mutation_builder service: tablet_allocator: Introduce tablet load balancer tablets: Introduce tablet_map::for_each_tablet() topology: Introduce get_node() token_metadata: Add non-const getter of tablet_metadata storage_service: Notify topology state machine after applying schema change storage_service: Implement stream_tablet RPC tablets: Introduce global_tablet_id stream_transfer_task, multishard_writer: Work with table sharder tablets: Turn tablet_id into a struct db: Do not create per-keyspace erm for tablet-based tables tablets: effective_replication_map: Take transition stage into account when computing replicas tablets: Store "stage" in transition info doc: Document tablet migration state machine and load balancer locator: erm: Make get_endpoints_for_reading() always return read replicas storage_service: topology_coordinator: Sleep on failure between retries storage_service: topology_coordinator: Simplify coordinator loop main: Require experimental raft to enable tablets