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

Interface Summary
ResetableIterator: This defines an iterator interface that will help the reducer class re-group its input by 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.

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