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).
However, if you choose Microsoft's Sound Mapper, it will use Microsoft's various codecs (coder-decoder algorithms) to convert this sample rate and bit-depth on-the-fly to one that is supported by your interface.