org.apache.hadoop.mapred.lib
Classes 
BinaryPartitioner
ChainMapper
ChainReducer
CombineFileInputFormat
CombineFileRecordReader
CombineFileRecordReaderWrapper
CombineFileSplit
CombineSequenceFileInputFormat
CombineTextInputFormat
FieldSelectionMapReduce
FilterOutputFormat
HashPartitioner
IdentityMapper
IdentityReducer
InputSampler
InverseMapper
KeyFieldBasedComparator
KeyFieldBasedPartitioner
LazyOutputFormat
LongSumReducer
MultipleInputs
MultipleOutputFormat
MultipleOutputs
MultipleSequenceFileOutputFormat
MultipleTextOutputFormat
MultithreadedMapRunner
NLineInputFormat
NullOutputFormat
RegexMapper
TokenCountMapper
TotalOrderPartitioner