Question 1

How to set up SSL connections with lua-resty-kafka?

Accepted Answer

Enable SSL by setting the 'ssl' option to true in client or producer config, and ensure you have ngx_lua 0.9.11+ or OpenResty 1.7.4.1+. You may also need to configure 'ssl_verify' for certificate validation as per Nginx cosocket API.

Question 2

lua-resty-kafka vs other Lua Kafka clients - which is better?

Accepted Answer

lua-resty-kafka excels in OpenResty environments with its non-blocking cosocket integration, but if you need full Kafka consumer features or aren't using Nginx, alternatives like custom Lua bindings might be more suitable, though they may lack its seamless event-driven design.

Question 3

Can I use consumer groups with lua-resty-kafka?

Accepted Answer

No, the library's basic consumer does not support consumer groups. You'll need to manage offsets manually or consider other clients for coordinated consumption, as stated in the TODO section for future enhancements.

Question 4

Is lua-resty-kafka production-ready?

Accepted Answer

It's marked as experimental and under early development, so while it works for many use cases, you should thoroughly test it in your environment and be prepared for potential breaking changes or missing features.

Question 5

How to handle errors when sending messages fails?

Accepted Answer

Use the error handling callback in async producer config to log or retry failed messages, and check for network or metadata errors documented in the Errors section, which maps Kafka error codes to descriptive strings.

Question 6

What OpenResty versions are compatible?

Accepted Answer

Requires at least ngx_lua 0.9.3 or OpenResty 1.4.3.7 for basic use, and ngx_lua 0.9.11+ or OpenResty 1.7.4.1+ for SSL support, with LuaJIT being mandatory.

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