Consistency models, revisited
On This Lesson 4 topics
This lesson is planned. The outline below lists the topics it will cover. The full lesson has not been published yet.
In this lesson
place real guarantees on the consistency spectrum.
Planned topics
- Linearizable: behaves like one copy, ordered by real time.
- Sequential, causal, read-your-writes, monotonic reads, eventual: progressively weaker, cheaper.
- Choose per operation: stock reservations need strong; a product view count does not.
- CAP is about behavior during a partition: choose consistency or availability then; PACELC adds latency in normal operation.
Draft outline details
Demonstration
a ladder diagram from linearizable down to eventual, with FulfillCo examples attached to each rung: stock reservation, order status page, search index.
Check your understanding
Which operation needs the strongest model: stock reservation or view count?
Show answer
Stock reservation.
Practice
Apply this lesson with the module's lab, exercises and quiz.
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