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bc6f7d1b20
We add garbage collection for the `CDC_GENERATIONS_V3` table to prevent it from endlessly growing. This mechanism is especially needed because we send the entire contents of `CDC_GENERATIONS_V3` as a part of the group 0 snapshot. The solution is to keep a clean-up candidate, which is one of the already published CDC generations. The CDC generation publisher introduced in #15281 continually uses this candidate to remove all generations with timestamps not exceeding the candidate's and sets a new candidate when needed. We also add `test_cdc_generation_clearing.py` that verifies this new mechanism. Fixes #15323 Closes scylladb/scylladb#15413 * github.com:scylladb/scylladb: test: add test_cdc_generation_clearing raft topology: remove obsolete CDC generations raft topology: set CDC generation clean-up candidate topology_coordinator: refactor publish_oldest_cdc_generation system_keyspace: introduce decode_cdc_generation_id system_keyspace: add cleanup_candidate to CDC_GENERATIONS_V3