How is HashMap structured internally?
Senior
56
Java
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265
How to choose between two implementations through one config without Spring Profiles?
Senior
55
What do Object.wait(), notify() and notifyAll() do?
Senior
54
Реализуйте thread-safe RateLimiter: не более 5 запросов в секунду для одного userId, метод isAllowed(String userId).
Senior
53
What is the contract between equals and hashCode?
Senior
51
Why did you use at-least-once instead of exactly-once when dealing with duplicates? What are the limitations of exactly-once?
Senior
51
How to increase the number of consumers in a group with ten partitions?
Senior
49
How do you guarantee message processing order in Kafka?
Senior
49
What was the domain of the application: fintech or something else?
Senior
49
How did you solve the problem of duplicate messages in Kafka?
Senior
49
How does Spring Boot magic work when connecting starters and auto-configuration?
Senior
43
How to increase the number of consumers in a single consumer group in Java/Spring application, including within one pod?
Senior
40
What other conditional annotations of Spring Boot do you know?
Senior
38
Briefly tell us about your last project: what was the domain, what technologies were used, and what was your role?
Senior
35
Did you work a lot with Kafka? What patterns did you use for consumers, idempotency, and error handling?
Senior
35
What message delivery semantics do you know besides at-least-once?
Senior
35
How to speed up this SQL query on a large table? What index to add and will an index only on status help?
Senior
33
Why not use scheduler for this? Can scheduler hang and how does it work with threads?
Senior
32
Write an SQL query: find top-3 user_id by sum of amount for orders with status COMPLETED in the last month.
Senior
32
How to increase performance if consumer lag accumulates in Kafka?
Senior
31