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.
The Application Master asks for: 1  a container located on the same Node Manager where the map split is stored (a map split may be stored on multiple nodes due to the HDFS replication factor); 2  otherwise, a container located on a Node Manager in the same rack where the the map split is stored;