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`check_and_repair_cdc_streams` is an existing API which you can use when the current CDC generation is suboptimal, e.g. after you decommissioned a node the current generation has more stream IDs than you need. In that case you can do `nodetool checkAndRepairCdcStreams` to create a new generation with fewer streams. It also works when you change number of shards on some node. We don't automatically introduce a new generation in that case but you can use `checkAndRepairCdcStreams` to create a new generation with restored shard-colocation. This PR implements the API on top of raft topology, it was originally implemented using gossiper. It uses the `commit_cdc_generation` topology transition state and a new `publish_cdc_generation` state to create new CDC generations in a cluster without any nodes changing their `node_state`s in the process. Closes #13683 * github.com:scylladb/scylladb: docs: update topology-over-raft.md test: topology_experimental_raft: test `check_and_repair_cdc` API raft topology: implement `check_and_repair_cdc_streams` API raft topology: implement global request handling raft topology: introduce `prepare_new_cdc_generation_data` raft_topology: `get_node_to_work_on_opt`: return guard if no node found raft topology: remove `node_to_work_on` from `commit_cdc_generation` transition raft topology: separate `publish_cdc_generation` state raft topology: non-node-specific `exec_global_command` raft topology: introduce `start_operation()` raft topology: non-node-specific `topology_mutation_builder` topology_state_machine: introduce `global_topology_request` topology_state_machine: use `uint16_t` for `enum_class`es raft topology: make `new_cdc_generation_data_uuid` topology-global
Scylla developer documentation
This folder contains developer-oriented documentation concerning the ScyllaDB codebase. We also have a wiki, which contains additional developer-oriented documentation. There is currently no clear definition of what goes where, so when looking for something be sure to check both.
Seastar documentation can be found here.
User documentation can be found on docs.scylladb.com
For information on how to build Scylla and how to contribute visit HACKING.md and CONTRIBUTING.md.