
99MapReduce Family of Large-Scale Data-Processing Systems
express ad hoc queries. In contrast to other systems such as Pig [109] or Hive [123],
it executes queries natively without translating them into MapReduce jobs. In par-
ticular, Dremel is designed to execute many queries that would ordinarily require a
sequence of MapReduce jobs.
2.7 CONCLUSIONS
The database community has always been focusing on dealing with the challenges
of Big Data management, although the meaning of “big” has been evolving continu-
ously to represent different scales over the time [24]. According to IBM, we are cur-
rently creating 2.5 quintillion bytes of data, ever ...