Java

How does a composite index work?

What is rebalancing in Kafka?

When is it better to use plain JDBC than JPA?

What is the difference between volatile and synchronized?

How was code review organized: how many approvals were required and who participated?

What are at-least-once and exactly-once in Kafka?

Tell about your experience working with Kotlin.

What was the most high-load case and what was the load in requests or transactions per second?

What are acks, retries, and idempotent producer in Kafka?

How to select ThreadPoolExecutor and when to use fixed, cached, single, and scheduled thread pools?

How to make a consumer safe with at-least-once delivery?

What solutions would you now do differently?

How to find and diagnose memory leak?

How to prevent lost update?

How to call @Transactional method from within the same bean so that the transaction works?

What happens between bean constructor and @PostConstruct method?

How does partition affect message order and Kafka scaling?

What do propagation and isolation mean in @Transactional and how to choose them?

How does garbage collector affect latency?

What SQL constraints do you know?