C.2.8:5.1 - Architecture account in prose and a diagram

A service account states:

The API returns “stored” only after the Store confirms a durable write. Reports read a Replica updated from Store and may lag by five minutes. A synchronous report query to Store was rejected because report bursts must not delay request writes. If required report freshness becomes one second, reconsider the replica update design.

A second expression adds this diagram while retaining those four sentences:

API --write--> Store --update--> Replica --read by--> Reports
API <--durable-write confirmation-- Store

The reader is an engineer familiar with durable writes and replicas. Select the acknowledgment dependency, report-source/lag relation, rejected alternative with its reason, and reconsideration condition. Both forms expose the same claims; the described architecture is unchanged. Compare recovery with the same three-minute budget and source access. The diagram’s presence alone establishes no advantage.

Suppose a reading trial recovers three selected relations from the prose and all four from the combined expression. Report that bounded observed difference and identify the additional relation. If a source paragraph was supplied only before the second reading, the comparison also changed assistance. If the same reader encountered both forms, previous reading may contribute. These conditions prevent attributing the whole difference to form alone.

A reader unfamiliar with replication may need a prerequisite explanation. Adding its substantive claims changes the account as well as its expression. If the design requirement changes to one-second freshness, the account supplies reconsideration of the replica update design. It does not supply a replacement architecture. C.33 can record this captured structure and the source return needed for the next design question.