Earning Points. Starwood's Preferred Guest program is fairly straightforward: the more nights you spend at participating hotels, the faster you'll earn a free night.
As seen in the EXECUTING phase, the map will write (using Mapper.Context.write()) its output into a circular in-memory buffer (MapTask.MapOutputBuffer). The size of this buffer is fixed and determined by the configuration parameter mapreduce.task.io.sort.mb (default: 100MB).
Now that the majority of audio interfaces have ASIO drivers, Microsoft's Sound Mapper device is almost completely redundant. However, in some cases it can be useful. For example, if you need to play old multimedia files, Sound Mapper can be used, as it can play back files with sample rates as low as 6kHz.