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The difference between redis cache breakdown and cache penetration

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The difference between cache breakdown and cache penetration: Cache breakdown: occurs when a large number of concurrent requests access uncached keys, causing excessive pressure on the database. Cache penetration: occurs when malicious requests or crawlers frequently access keys that have never been cached, resulting in unnecessary database access.

The difference between redis cache breakdown and cache penetration

The difference between Redis cache penetration and cache penetration

Question: Cache penetration What is the difference between penetration and cache penetration?

Answer:

Cache penetration and Cache penetration are two different cache problems:

Cache breakdown

  • Description: When a specific key does not exist in the cache, and there are a large number of concurrent requests accessing it at the same time in a short period of time When this key is entered, a cache breakdown occurs.
  • Cause: Because the key is not in the cache, all requests directly access the database, resulting in excessive pressure on the database and even a crash.
  • Solution: Use a locking mechanism or other means to prevent concurrent requests from accessing uncached keys at the same time, and handle cache misses.

Cache Penetration

  • Description: When certain keys have never been cached and are accessed through malicious requests or Cache penetration occurs when crawlers access frequently.
  • Cause: The key does not exist in the cache, all requests will directly access the database, even if the key does not exist.
  • Solution: Check the validity of all requests, and directly return errors or null values ​​for non-existent keys to avoid unnecessary database access.

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