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Spring Data MongoDB & Redis

4 roadmaps31 questions

The document and key-value modules: MongoDB mapping, templates and aggregation, Redis templates and repositories, Redis as a cache and message bus, and reactive Mongo. Interviewers pick from here when the system design involves something other than a relational store.

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When would you choose RedisTemplate over @RedisHash repositories, and what architectural tradeoffs drive that decision?

level: principalimportance: nice to knowfreq 25%

basics

~20 s

Use RedisTemplate when you need control over the actual Redis structures — counters, queues, sorted sets, atomic ops, pub/sub, or custom keys. Use @RedisHash repositories for simple id-keyed aggregates with a JPA-like API and a few indexed lookups.

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