Bound notification fan-out without creating one huge transaction
One workspace event targets 50,000 hypothetical members and the proposed transaction attempts to create every delivery row at once.
- Focused work estimate
- 3h 30m + prerequisites
- Priority in the scenario
- Medium
- Engineering practice
- Fan-out · Batching
Estimated field mix
- System design40%
- Distributed systems30%
- Performance engineering30%
Field percentages are editorial estimates of the ticket's engineering focus. They total 100%; they are not measured time, proficiency scores, or ownership evidence.
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Project context
A fictional collaboration tool sends email and in-app notifications. Duplicate alerts and preference changes reveal that the design has no single definition of delivery.
Setup prerequisites
- Create synthetic recipients, events and fake delivery providers.
- Do not send real email or messages.
Preceding work
Complete these dependencies, or supply their agreed outputs before taking this ticket.
- ANOTIFY-101 · Separate notification intent from channel delivery and human receipt
- ANOTIFY-102 · Specify recipient resolution without copying event payloads broadly
- ANOTIFY-103 · Choose when notification preferences are evaluated
- ANOTIFY-104 · Model notification intent and dispatch in one durable transaction
Acceptance criteria
- Specify bounded recipient pages and stable page checkpoints.
- Preserve one logical intent per recipient across retries.
- Define membership snapshot versus live-membership semantics.
Implementation constraints
- Use a synthetic membership generator with documented cardinality.
Verification to include
- Process a 1,000-recipient local sample in fixed-size pages.
- Interrupt a page and resume without duplicate recipient intents.
Deliverables
- Fan-out plan and checkpoint prototype
Rollout and recovery
Validate with local samples before wider scale assumptions; pause dispatch while keeping checkpoints.
Value of the work
For the engineer: Practice asynchronous contracts, preference timing and delivery uncertainty.
For the team: Review a notification design that controls nuisance, disclosure and recovery.
Evidence boundaries
Outcome Evidence: Tests, patches, and runbooks are requested deliverables. They become Outcome Evidence only through a qualified Mission and immutable Evidence IDs.
Ownership Evidence: Independent adaptation must be observed under a declared verification policy and cite immutable Evidence IDs. Completing a planning ticket establishes no Ownership Evidence.