I did it in a paged way because that was the most obvious way to me (I'm not all that familiar with the jclouds code yet). I wouldn't expect there to be a huge number of chunks so I'd expect all of the chunks to come back in a single page most of the time.

I'm happy to take guidance on whether this should be done in parallel, paged or in one shot (if that's an option). If it should be done in parallel what classes should I look at to get started? Either examples of other places that do things in parallel, or pointers at the classes or methods I'd use to do it in parallel would be helpful.