Question 1046

Eight Seconds Gone

An order service replicates asynchronously from its primary region to a standby, and monitoring shows replication lag hovering around 8 seconds under peak load. The primary region loses power and the team promotes the standby. What should they expect?

A

The promoted region refuses writes until the original primary comes back and streams the missing segment of its log

B

Roughly the last 8 seconds of committed orders are missing from the promoted region, an RPO the business has to reconcile

C

No data is lost, because the primary acknowledged those commits, and an acknowledgement implies the standby had already received them

D

No data is lost, but the promoted region serves stale reads for about 8 seconds while it applies the backlog it already holds