Tinker10:20. R 2, W 2, last writer wins: 8 hinges sold, 1 lost from the count.North 1/0, East 1/0, West 2/0 · 1 sale
Chapter 5 of 7
Who wins
Quorums fixed the stale reads. But the two buyers of the last hinge are back, and the quorum still prints two receipts.
This chapter: When two writes clash, which one wins, and what is lost?
About this chapter
You will learn
- Last writer wins keeps one write and drops the other
- A lost update: a sale the count forgets
- Reservations at one primary sell one at a time
Words you’ll meet
- Last writer wins
- A conflict rule: keep the version with the newest timestamp and drop the rest.
- Lost update
- A change that vanished because another write, based on older data, replaced it.
- Primary
- The one replica that decides every order, so sales happen one at a time.
Step 1 of 4
Quorums ended the stale reads: R and W are 2. The last hinge is down to one again.
Predict the receipts.