Restrict download file bandwidth/speed in Servlet

Question

we got high-load java application which works in clustered mode.

I need to add ability to download and upload files for our customers. For storing files i\'m going

Answer 1

Also I'm afraid, that users can create a lot of concurent threads during download and it can hurt performance.

Could it be an issue for servlet container ?

Yes, it could.

If it could be an issue, how can it be avoided ? probably using nio ?

NIO won't help per se. It certainly won't prevent the low-bandwidth responses tying up threads for long periods of time.

I think what you would need to do is to implement downloads in a special web container. I'm not sure, but I think that Servlet 3.0 with async mode might do the trick.

Answer 2

Leaky bucket or token bucket algorithms can be used to control the network bandwidth.

EDIT: I did some quick prototyping and implemented the algorithm leveraging Servlet 3.0 asynchronous processing. Results are pretty good. Full source code can be found on GitHub. Have fun!