How do you fix a hot partition?
Solution and explanation
- Improve keys, salt carefully, add partitions and preserve ordering requirements.
How are null-key records partitioned?
Solution and explanation
- Behavior varies by client; do not rely on null keys for business ordering.
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How do you order bank account events?
Solution and explanation
- Key deposit, withdrawal and balance events by accountId.
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Where does Kafka fit in banking?
Solution and explanation
- It distributes notification, fraud, audit and integration events; it is not the ledger.
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What is the transactional outbox pattern?
Solution and explanation
- Write business data and an outbox event atomically, then publish the outbox to Kafka.
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What problem does an outbox solve?
Solution and explanation
- It prevents database success with a lost Kafka event.
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How does Kafka support order processing?
Solution and explanation
- orders.created independently drives payment, inventory, shipping, notification and analytics.
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What if one downstream service is unavailable?
Solution and explanation
- Other groups continue and the service resumes from its committed offset.
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REST versus Kafka?
Solution and explanation
- REST is typically synchronous; Kafka is asynchronous, durable and decoupled.
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Should Kafka replace REST?
Solution and explanation
- No; production systems commonly use both at different boundaries.