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