Package org.apache.hadoop.mapred.join

Interface Summary

Interface	Description
ComposableInputFormat<K extends WritableComparable,V extends Writable>	Refinement of InputFormat requiring implementors to provide ComposableRecordReader instead of RecordReader.
ComposableRecordReader<K extends WritableComparable,V extends Writable>	Additional operations required of a RecordReader to participate in a join.
ResetableIterator<T extends Writable>	This defines an interface to a stateful Iterator that can replay elements added to it directly.

Class Summary

Class	Description
ArrayListBackedIterator<X extends Writable>	This class provides an implementation of ResetableIterator.
CompositeInputFormat<K extends WritableComparable>	An InputFormat capable of performing joins over a set of data sources sorted and partitioned the same way.
CompositeInputSplit	This InputSplit contains a set of child InputSplits.
CompositeRecordReader<K extends WritableComparable,V extends Writable,X extends Writable>	A RecordReader that can effect joins of RecordReaders sharing a common key type and partitioning.
InnerJoinRecordReader<K extends WritableComparable>	Full inner join.
JoinRecordReader<K extends WritableComparable>	Base class for Composite joins returning Tuples of arbitrary Writables.
MultiFilterRecordReader<K extends WritableComparable,V extends Writable>	Base class for Composite join returning values derived from multiple sources, but generally not tuples.
OuterJoinRecordReader<K extends WritableComparable>	Full outer join.
OverrideRecordReader<K extends WritableComparable,V extends Writable>	Prefer the "rightmost" data source for this key.
Parser	Very simple shift-reduce parser for join expressions.
Parser.Node
Parser.NodeToken
Parser.NumToken
Parser.StrToken
Parser.Token	Tagged-union type for tokens from the join expression.
StreamBackedIterator<X extends Writable>	This class provides an implementation of ResetableIterator.
TupleWritable	Writable type storing multiple Writables.
WrappedRecordReader<K extends WritableComparable,U extends Writable>	Proxy class for a RecordReader participating in the join framework.

Enum Summary

Enum	Description
Parser.TType