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Monotonic reads.

also: monotonic read · monotonic read consistency

Once a user has seen a version of the data, later reads never show them an older version.

the two-minute refresher

Without it, two reads hitting replicas with different lag make data jump back in time.
Implement it by pinning a user's session to one replica.
Needed for comment threads and timelines that must not reorder or vanish.

Where the course teaches it

W01 · Day 2Replication Trade-offslearn it →W05 · Day 1Consistency Modelsrevisit →

Related concepts

Read-your-writes consistency
Replication lag
Sticky sessions