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.
/benchmarks/streaming-21/hduser1/terasort/terasort-output Terasort has both map tasks and reduce tasks. The number of reduce tasks can be specified with mapred.reduce.tasks but the number of map tasks is automatically determined by dividing the total size of the input files by the HDFS block size. 1 TB (base 10) divided by 512 MiB (base 2) will give you 1863 map tasks.