Amazon Cloud Computing Question:

Multi-threading fetching in Amazon S3 is used to fetch the objects concurrently using the multiple threads and map the task so that fetching can be made simpler.
It is not a good practice to increase the threading for a particular object as every node on the server has some bandwidth constraints.
It provides user the ease with which they can upload the files and upload the threads in parallel.
It provides high speed of data transfer and easy maintenance of the sever as well.