| Package | Description | 
|---|---|
| org.apache.hadoop.mapred.join | |
| org.apache.hadoop.mapreduce.lib.join | 
| Class and Description | 
|---|
| ArrayListBackedIterator This class provides an implementation of ResetableIterator. | 
| ResetableIterator This defines an interface to a stateful Iterator that can replay elements
 added to it directly. | 
| StreamBackedIterator This class provides an implementation of ResetableIterator. | 
| TupleWritable Writable type storing multiple  Writables. | 
| Class and Description | 
|---|
| ComposableInputFormat Refinement of InputFormat requiring implementors to provide
 ComposableRecordReader instead of RecordReader. | 
| ComposableRecordReader Additional operations required of a RecordReader to participate in a join. | 
| CompositeRecordReader A RecordReader that can effect joins of RecordReaders sharing a common key
 type and partitioning. | 
| JoinRecordReader Base class for Composite joins returning Tuples of arbitrary Writables. | 
| MultiFilterRecordReader Base class for Composite join returning values derived from multiple
 sources, but generally not tuples. | 
| Parser.Node | 
| Parser.Token Tagged-union type for tokens from the join expression. | 
| Parser.TType | 
| ResetableIterator This defines an interface to a stateful Iterator that can replay elements
 added to it directly. | 
| TupleWritable Writable type storing multiple  Writables. | 
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