Hello all, I am a new to hadoop and hive in general and i am reading "hadoop the definitive guide" by Tom White and on page 504 for the hive chapter, Tom says below with regards to soritng
*Sorting and Aggregating* *Sorting data in Hive can be achieved by using a standard ORDER BY clause. ORDER BY performs a parallel total sort of the input (like that described in “Total Sort” on page 261). When a globally sorted result is not required—and in many cases it isn’t—you can use Hive’s nonstandard extension, SORT BY, instead. SORT BY produces a sorted file per reducer.* My Questions is, what exactly does he mean by "globally sorted result"?, if the sort by operation produces a sorted file per reducer does that mean at the end of the sort all the reducer are put back together to give the correct results ?
