advanced~2h
Distributed Transactions: Why 2PC Fails at Scale
Spring Boot Mastery's @Transactional works because one database can guarantee atomicity by itself. Once a business operation spans multiple SERVICES, each with its own database, that guarantee quietly disappears — this module is why, precisely.
Learning objectives
- Beginner: Explain why @Transactional alone can't keep two different services' databases consistent.
- Intermediate: Describe how Two-Phase Commit (2PC) attempts to solve this, and name its coordinator's two phases.
- Advanced: Explain why 2PC is rarely used in real microservices systems despite solving the theoretical problem.
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Distributed Transactions: Why 2PC Fails at Scale