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d74f303406
When a node bootstraps or upgrades from a pre-CDC version, it creates a new CDC generation, writes it to a distributed table (system_distributed.cdc_generation_descriptions), and starts gossiping its timestamp. When other nodes see the timestamp being gossiped, they retrieve the generation from the table. The bootstrapping/upgrading node therefore assumes that the generation is made durable and other nodes will be able to retrieve it from the table. This assumption could be invalidated if periodic commitlog mode was used: replicas would acknowledge the write and then immediately crash, losing the write if they were unlucky (i.e. commitlog wasn't synced to disk before the write was acknowledged). This commit enforces all writes to the generations table to be synced to commitlog immediately. It does not matter for performance as these writes are very rare. Fixes https://github.com/scylladb/scylla/issues/7610. Closes #7619