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Summary: I want to use `ReplicaFirst` read connection type since `ReplicaOnly` is a bit too restrictive. We've had 2 MySQL SEVs this year when all the replicas went down crashing our services despite the primary instance working normally. There was also a case when I've deleted too much rows at once and all replicas went down due to replication lag (I know better now) RFC - Yay or Nay? - Should I expand `ReadConnectionType` to mirror all options of `InstanceRequirement`? - Perhaps it's worth moving it into the `common/rust/shed/sql` crate? I kept cleaning up all the usages out of this diff to keep the changes minimal for RFC Differential Revision: D30574326 fbshipit-source-id: 1462b238305d47557372afe7763096c53df55f10 |
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