I applied online.

Round 2 covered several topics:

• Why do we need partitions in Kafka?
• What happens in distributed transactions if a payment succeeds and inventory is not locked?
• Replication factor in Kafka.
• Why Spring WebFlux @Scheduler is used, and what happens if there are 3 instances and the scheduler does the same work again and again in all 3 instances.
• How @Async impacts other services if one payment service is done, and how you resolve it.
• RBAC-based authentication and authorization system schema.