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4351eee1f6
When the node with CDC enabled and with the topology on raft disabled bootstraps, it reads system.cdc_local for the last generation. Nodes with both enabled use group0 to get the last generation. In the following scenario with a cluster of one node: 1. the node is created with CDC and the topology on raft enabled 2. the user creates table T 3. the node is restarted in the recovery mode 4. the CDC log of T is extended with new entries 5. the node restarts in normal mode The generation created in the step 3 is seen in system_distributed.cdc_generation_timestamps but not in system.cdc_generations_v3, thus there are used streams that the CDC based on raft doesn't know about. Instead of creating a new generation, the node should use the generation already committed to group0. Save the last CDC generation in the system.cdc_local during loading the topology state so that it is visible for CDC not based on raft. Fixes scylladb/scylladb#17819