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Redis vs Varnish: What are the differences?
Redis: An in-memory database that persists on disk. Redis is an open source, BSD licensed, advanced key-value store. It is often referred to as a data structure server since keys can contain strings, hashes, lists, sets and sorted sets; Varnish: High-performance HTTP accelerator. Varnish Cache is a web application accelerator also known as a caching HTTP reverse proxy. You install it in front of any server that speaks HTTP and configure it to cache the contents. Varnish Cache is really, really fast. It typically speeds up delivery with a factor of 300 - 1000x, depending on your architecture.
Redis can be classified as a tool in the "In-Memory Databases" category, while Varnish is grouped under "Web Cache".
"Performance", "Super fast" and "Ease of use " are the key factors why developers consider Redis; whereas "High-performance", "Very Fast" and "Very Stable" are the primary reasons why Varnish is favored.
Redis and Varnish are both open source tools. It seems that Redis with 37.4K GitHub stars and 14.4K forks on GitHub has more adoption than Varnish with 908 GitHub stars and 216 GitHub forks.
According to the StackShare community, Redis has a broader approval, being mentioned in 3265 company stacks & 1789 developers stacks; compared to Varnish, which is listed in 1006 company stacks and 140 developer stacks.
Pros of Redis
- Performance880
- Super fast537
- Ease of use510
- In-memory cache441
- Advanced key-value cache321
- Open source190
- Easy to deploy179
- Stable163
- Free152
- Fast120
- High-Performance40
- High Availability39
- Data Structures34
- Very Scalable32
- Replication23
- Pub/Sub20
- Great community20
- "NoSQL" key-value data store17
- Hashes14
- Sets12
- Sorted Sets10
- Lists9
- BSD licensed8
- NoSQL8
- Integrates super easy with Sidekiq for Rails background7
- Async replication7
- Bitmaps7
- Keys with a limited time-to-live6
- Open Source6
- Strings5
- Lua scripting5
- Hyperloglogs4
- Awesomeness for Free!4
- Transactions3
- Runs server side LUA3
- outstanding performance3
- Networked3
- LRU eviction of keys3
- Written in ANSI C3
- Feature Rich3
- Performance & ease of use2
- Data structure server2
- Simple1
- Channels concept1
- Scalable1
- Temporarily kept on disk1
- Dont save data if no subscribers are found1
- Automatic failover1
- Easy to use1
- Existing Laravel Integration1
- Object [key/value] size each 500 MB1
Pros of Varnish
- High-performance104
- Very Fast67
- Very Stable57
- Very Robust44
- HTTP reverse proxy37
- Open Source21
- Web application accelerator18
- Easy to config11
- Widely Used5
- Great community4
- Essential software for HTTP2
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Cons of Redis
- Cannot query objects directly14
- No secondary indexes for non-numeric data types2
- No WAL1