Package org.apache.hadoop.contrib.utils.join

Interface Summary

ResetableIterator

This interface defines an iterator interface that will help the reducer class for re-grouping the values in the values iterator of the reduce method according the their source tags.

Class Summary

ArrayListBackedIterator	This class provides an implementation of ResetableIterator.
DataJoinJob	This class implements the main function for creating a map/reduce job to join data of different sources.
DataJoinMapperBase	This abstract class serves as the base class for the mapper class of a data join job.
DataJoinReducerBase	This abstract class serves as the base class for the reducer class of a data join job.
JobBase	A common base implementing some statics collecting mechanisms that are commonly used in a typical map/reduce job.
TaggedMapOutput	This abstract class serves as the base class for the values that flow from the mappers to the reducers in a data join job.