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Parallelization is the approach taken by Haakon@AWS in his Java code example of how to get the most out of SimpleDB. You can find the code at Indexing and Querying Amazon S3 Metadata with Amazon SimpleDB. We'll also consider how a back-end service architecture built on Erlang may be a better fit with cloud computing. Two general mechanisms of parallelism are available: threads and boxes. To get the most bang out of a single machine you need threads (events, etc). To scale beyond the load handled by a single machine you need multiple boxes. The example code uses the Executor Thread Pool for parallelism within a program. Thread pools are a pretty common idiom by now. Amazon's queue service SQS was used to distribute work amongst boxes.