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A comment on Blueprint for a distributed multi-region IAM with Go and CockroachDB. Parent comment

Re:Blueprint for a distributed multi-region IAM with Go and ... by prpl on Tuesday August 08, 2023 @11:18AM (#37050311)
not sure if it applies but depending on instance type I usually see pings in the .55ms range in a single AZ in AWS, cross-AZ pings higher (implying it is hard to be sub ms for many types of durable applications, especially if disk/S3 is involved)
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Re:Blueprint for a distributed multi-region IAM with Go and ... by magden on Tuesday August 08, 2023 @03:50PM (#37054566)
When discussing GCP, the latency between AZs within the same region is approximately 5 ms. Thus, if you have a 3-node database cluster spanning 3 AZs (all within the same region), a transaction can be committed in the 5-10ms range using Raft. CockroachDB should handle this seamlessly.

However, if you're considering a multi-region setup, the latency will depend on the distance between the regions.That's why usually you define a preferred region (that stores primary copy of the records) or deploy in a geo-partitioned mode (when data is automatically pinned to configured regions).

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