CODEWITHSUNDEEP
redis
Ana Lava
Ana Lava

Reputation: 787

Redis data type to keep view count of posts

I want to keep the viewCount of posts in Redis, While I'm not sure which of the following approaches is more performant:

  1. For each post have a redis unique key and store the viewCount as value for it: For example have the key viewCount856 with value 1000 which means the viewCount of post with id 856 is 1000.

  2. Have a redis sorted set (zset) as described here and use each postId as score and the associated viewCount as value for that score. For example have a zset called viewCount and add all the posts and their viewCount to this set having their id as score.

  3. Any other data type that is performant for this use-case and I hadn't thought of.

I would appreciate any other suggestions that will help implementing this in the best way.

Upvotes: 1

Views: 1315

Answers (1)

Itamar Haber
Itamar Haber

Reputation: 50052

... implementing this in the best way

There is no "best way" - it is always a tradeoff so you need to pick what's important to you. Important means how you'll be accessing the data - with approach #1 you'd only be able to fetch a single counter, whereas with #2 you'd be able to use ranges.

If you don't need ranges, I'd go with #1 and consider using Hashes to optimize memory consumption (see https://redis.io/topics/memory-optimization#using-hashes-to-abstract-a-very-memory-efficient-plain-key-value-store-on-top-of-redis for the details). That will give you constant time access.

However, if ranges are required (e.g. top-n viewed posts), a Sorted Set will do nicely. The tradeoff here is more memory and O(n*logn) access.

Upvotes: 3

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