10 most important Interview Points to remember about Cache as a Software Engineer
7 April, 2022
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The 10 most important things to prepare about caching if you are appearing in a software engineer interview, especially backend are the following.
- What can be cached — Client, Server, In Between (Server-Database ), API, Hardware (CPU). Operations that are used frequently, heavy operation/computation;
- Cache — Hardware or software that stores the data to provide faster access (the result of the heavy computation, API responses, API requests);
- Write through cache — when the cache is updated in cache and memory synchronously, recover data if the process dies. Pros — simpler and reliable; cons — better works when not so many writes in cache;
- Cache Hit— find requested data in the cache
- Cache miss — did not find stored cache because of pure design
- Cache eviction policy — rules when cached will be removed (LRU (recent), LFU (frequent), FIFO (queue))
- Content Delivery Network (CDN) — third party service that caches your server (based on region), always better latency. PoP (Point of Presence). Cloudflare, Google Cloud CDN.
- Write back cache — when cache updated in cache and memory asynchronously;
- If we care of the staleness of cache (accuracy of data) -> we use local cache; if accuracy is important (views, likes) — use third party cache (Redis)
- Golden Rule: Not every time, when optimizations are needed to be done and caching is the perfect solution.
Programming
cache
caching
redis
software
software devlopment
software developer
software engineer
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