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.
The mapper output (intermediate data) is stored on the Local file system (NOT HDFS) of each individual mapper nodes. This is typically a temporary directory location which can be setup in config by the hadoop administrator. The intermediate data is cleaned up after the Hadoop Job completes.
Initially, the data for a MapReduce task is stored in input files, and input files typically reside in HDFS. Although these files format is arbitrary, line-based log files and binary format can be used. Using InputFormat we define how these input files are split and read. The InputFormat class is one of the fundamental classes in the Hadoop MapReduce framework which provides the following functionality: