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2dedb5ea75
Until now, the Alternator TTL feature was considered "experimental", and had to be manually enabled on all nodes of the cluster to be usable. This patch removes this requirement and in essence GAs this feature. Even after this patch, Alternator TTL is still a "cluster feature", i.e., for this feature to be usable every node in the cluster needs to support it. If any of the nodes is old and does not yet support this feature, the UpdateTimeToLive request will not be accepted, so although the expiration-scanning threads may exist on the newer nodes, they will not do anything because none of the tables can be marked as having expiration enabled. This patch does not contain documentation fixes - the documentation still suggests that the Alternator TTL feature is experimental. The documentation patch will come separately. Fixes #12037 Signed-off-by: Nadav Har'El <nyh@scylladb.com> Closes #12049