Cross-Region Latency Spike

Round-trip latency between the US and EU regions has spiked sharply, and both regions otherwise report healthy local metrics — this is specifically a problem with the link between them. Payment authorization must remain strongly consistent across regions: a business requirement, because an authorization decided independently by both regions during this kind of network degradation risks a double charge that cannot be safely undone afterward. No other business constraint requires the rest of the platform's cross-region traffic to stay synchronous. Diagnose what is actually driving customer-facing latency in each region, and decide how to respond without compromising the one operation that cannot afford it.

Difficulty

Staff

Expected Time

~15 min

Category

Distributed Systems