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Interesting question. You should not expect reads to be strongly consistent across regions, There could be delays replicating data across regions ( even though ms). Can you have region specific counters, or update counters in only one region? You may also need to put your logic in a transaction and transactional operations provide atomicity, consistency, isolation, and durability (ACID) guarantees only within the region where the write is made originally. Transactions are not supported across regions in global tables.
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Thank you for the quick response! The counters can't be region specific, but I can definitely update counters in one region - it may make sense to provision the table in a central region to help with latency from requests across regions.