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e486e0f759
Each CDC generation always has a timestamp, but the fact that the timestamp identifies the generation is an implementation detail. We abstract away from this detail by using a more generic naming scheme: a generation "identifier" (whatever that is - a timestamp or something else). It's possible that a CDC generation will be identified by more than a timestamp in the (near) future. The actual string gossiped by nodes in their application state is left as "CDC_STREAMS_TIMESTAMP" for backward compatibility. Some stale comments have been updated.