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).
Custom Text Input Format Record Delimiter for Hadoop. By default mapreduce program accepts text file and it reads line by line. Technically speaking the default input format is text input format and the default delimiter is â/nâ (new line). In several cases, we need to override this property.