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I need to consume a JSON-formatted data stream via WebSocket, and send the data as is to a Redis server. That's all this application needs to do; no UI, no requests need to be attended and the data doesn't need to be processed at all.

I want to get the smallest footprint and highest performance. Do you think Node.js/V8 would handle this scenario better than the Java/JVM? I'm between these 2 options because are the ones I can manage, although my main skill is Java.

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It all depends on the environment that you're installing the application on, and how much experience you have with each.

Nodes event-loop based model is very efficient, however I have found Java to perform better for CPU intensive tasks. I don't consider myself to be an expert on either (approx 10 months Node.js, 3 years part-time Java experience) so don't take my answer as gospel.

In your case you're only really performing I/O which is where Node.js excells, if you're good with JavaScript pick Node!

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You're right, the solely purpose for this app is to consume the stream and send the JSON data to a Redis list. I don't have much experience with Node, although the fact that I know JavaScript well encourages me to try it out!
I've used it for a while and personally seen it grow... from only running on Linux, to having full Windows support. I really enjoy programming Node applications, and my university project was to use WebSockets (Also a great technology).
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Node.js and socket.io is easy to setup and deploy in this case. Way easy to deploy. You will be ~20-30mb ram on memory usage problem with metrix on performance here is hard because its hard to benchmark websockets. If its gone not be deployed on heroku then i would go for node.js

You can use node.js + socket.io or node.js / ruby + faye.

With traffic generating < 8k requests / sec it should be fine on both of them with very basic VPS / hardware setup.

I used faye on ruby with 1.1k clients chat over web sockets with 0 problems. And we had peak 4k clients on node.js chat. Very basic hardware.

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I guess what I mean by performance is more about the I/O handling and the V8 engine to perform a task like this.
node.js is really good ar handling load of I/O connections. Event Loop ftw :)
Benchmarking Node + Socket.io on Linux (Dell XPS l502x Laptop) I got Node.js to handle Average of 30,000 Message / Second.
Depends on hardware i was not able too push through redis more then 22k messages / sec on my MacBook Pro
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I would suggest Node.js if you have enough experience with it.

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Have you went through this experience? I've seen that implementing a WebSocket client in Node.js is a bit tricky (specially if I don't want to use a browser library).
You need to be careful when using WebSockets... many browsers have their own implementation see here: stackoverflow.com/questions/1253683/… (Also Socket.IO provides for fallbacks such as AJAX Polling)

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