org.apache.hadoop.mapred.lib
Interfaces 
InputSampler.Sampler
Classes 
BinaryPartitioner
ChainMapper
ChainReducer
CombineFileInputFormat
CombineFileRecordReader
CombineFileSplit
DelegatingInputFormat
DelegatingMapper
FieldSelectionMapReduce
HashPartitioner
IdentityMapper
IdentityReducer
InputSampler
InputSampler.IntervalSampler
InputSampler.RandomSampler
InputSampler.SplitSampler
InverseMapper
KeyFieldBasedComparator
KeyFieldBasedPartitioner
LongSumReducer
MultipleInputs
MultipleOutputFormat
MultipleOutputs
MultipleSequenceFileOutputFormat
MultipleTextOutputFormat
MultithreadedMapRunner
NLineInputFormat
NullOutputFormat
RegexMapper
TokenCountMapper
TotalOrderPartitioner