[Solved] Given this pseudocode for an Outbox pattern implementation, what will be the output... Given this pseudocode for an Outbox pattern implementation, what will be the output if the transaction fails? | Microservices

Microservices - Advanced Patterns

Given this pseudocode for an Outbox pattern implementation, what will be the output if the transaction fails?

begin transaction
write data change
write event to outbox
commit transaction
publish event from outbox

ANeither data change nor event is saved or published

BEvent is published but data change is lost

CData change saved but event not published

DEvent published twice

Step-by-Step Solution

Solution:

Step 1: Analyze transaction failure impact
If the transaction fails, none of the writes (data change or outbox event) are committed to the database.
Step 2: Understand event publishing dependency
Since the event is published only after commit, no event will be published if commit fails.
Final Answer:
Neither data change nor event is saved or published -> Option A
Quick Check:
Failed transaction means no data or event saved [OK]

Quick Trick: Failed transaction means no commit, no event published [OK]

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Given this pseudocode for an Outbox pattern implementation, what will be the output if the transaction fails?