Write-behind
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
understand why write-behind is risky and when it is acceptable.
Planned topics
- Write-behind: write to the cache, return immediately, persist to the database later in batches.
- Gains: very fast writes, batching, absorbs spikes.
- Risk: if the cache or node dies before the flush, the writes are lost; ordering and failures become hard.
- Acceptable only for data you can lose or rebuild: view counters, last-seen timestamps, analytics. Never for orders or payments.
Draft outline details
Demonstration
timeline: write at 10:00:00 acknowledged, flush at 10:00:05, crash at 10:00:03: write lost.
Check your understanding
Why not use write-behind for orders?
Show answer
An acknowledged order could be lost before it reaches the database.
Practice
Apply this lesson with the module's lab, exercises and quiz.
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