Eventual consistency: a liveness guarantee that, absent new writes, all replicas eventually agree. It permits stale reads in exchange for higher availability and lower latency.
2 / 5
What is a stale read in an eventually consistent system?
Stale read: a client observes an older value because the replica it queried has not yet received the latest update. This is the trade-off for availability.
3 / 5
What is read-your-writes consistency?
Read-your-writes: a session-level guarantee ensuring a user immediately sees the effects of their own updates even in an otherwise eventually consistent store.
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How do CRDTs help with eventual consistency?
CRDT (conflict-free replicated data type): data structures whose merge operation is commutative and associative, so replicas converge automatically without a central coordinator.
5 / 5
Which scenario best suits eventual consistency?
Good fit: high-volume, low-stakes data (view counts, timelines) tolerates temporary divergence, gaining availability and scale. Strict invariants need stronger guarantees.