- All Implemented Interfaces:
- Configurable, Tool
public class Join
extends Configured
implements Tool
Given a set of sorted datasets keyed with the same class and yielding
equal partitions, it is possible to effect a join of those datasets
prior to the map. The example facilitates the same.
To run: bin/hadoop jar build/hadoop-examples.jar join
[-r reduces]
[-inFormat input format class]
[-outFormat output format class]
[-outKey output key class]
[-outValue output value class]
[-joinOp <inner|outer|override>]
[in-dir]* in-dir out-dir