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).
JPA 2.0 allows for a Map where the key is not part of the target object to be persisted. The Map key can be any of the following: 1  A Basic value, stored in the target's table or join table. 2  An Embedded object, stored in the target's table or join table.