Question 1

How do I use crystal-redis with the Kemal web framework?

Accepted Answer

Use Redis::PooledClient for connection pooling to handle concurrent requests safely. The README explicitly warns that pooling is necessary in web contexts like Kemal, and examples are available in the crystal-redis-examples repository.

Question 2

Is crystal-redis faster than redis-rb for Ruby?

Accepted Answer

Yes, according to the 2015 benchmarks, crystal-redis achieved over 680,000 commands per second with pipelining, while redis-rb with Hiredis handled 150,000. However, these numbers may be outdated for modern comparisons.

Question 3

Does crystal-redis support Redis transactions and LUA scripting?

Accepted Answer

Yes, it fully supports transactions (MULTI/EXEC) and LUA scripting (eval), as listed in the features. You can use them directly via the idiomatic Crystal API.

Question 4

How to handle pipelining in crystal-redis for better performance?

Accepted Answer

The library supports pipelining natively; batch commands to reduce round-trip latency. Refer to the crystal-redis-examples repository for specific usage patterns and benchmarks.

Question 5

What's the main drawback of using crystal-redis compared to clients in other languages?

Accepted Answer

The primary limitation is its dependence on Crystal, which has a smaller community and ecosystem than languages like Python or JavaScript, affecting tooling, support, and future-proofing.

Question 6

How to install crystal-redis on Linux without Homebrew issues?

Accepted Answer

On Linux, ensure libssl-dev is installed via your package manager (e.g., apt-get install libssl-dev), then add the shard to shard.yml. The process is standard for Crystal shards, unlike the MacOS X complexities.

crystal-redis

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