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c255740989
We want to add strongly consistent tables as an option. We will have two kind of strongly consistent tables: globally consistent and locally consistent. The former means that requests from all DCs will be globally linearisable while the later - only requests to the same DCs will be linearisable. To allow configuring all the possibilities the patch adds new parameter to a keyspace definition "consistency" that can be configured to be `eventual`, `global` or `local`. Non eventual setting is supported for tablets enabled keyspaces only. Since we want to start with implementing local consistency configuring global consistency will result in an error for now.