org.apache.hadoop.mapred.lib
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## Package `org.apache.hadoop.mapred.lib`

Added Classes
`BinaryPartitioner` | Partition BinaryComparable keys using a configurable part of the bytes array returned by BinaryComparable#getBytes()
`CombineFileInputFormat` | An abstract org.apache.hadoop.mapred.InputFormat that returns i int) method.
`CombineFileRecordReader` | A generic RecordReader that can hand out different recordReaders for each chunk in a CombineFileSplit A CombineFileSplit can combine data chunks from multiple files.
`CombineFileSplit` | A sub-collection of input files.

Changed Classes and Interfaces
ChainMapper | The ChainMapper class allows to use multiple Mapper classes within a single Map task.
ChainReducer | The ChainReducer class allows to chain multiple Mapper classes after a Reducer within the Reducer task.
DelegatingInputFormat | An InputFormat that delegates behaviour of paths to multiple other InputFormats.
DelegatingMapper | An Mapper that delegates behaviour of paths to multiple other mappers.
FieldSelectionMapReduce | This class implements a mapper/reducer class that can be used to perform field selections in a manner similar to unix cut.
HashPartitioner | Partition keys by their Object#hashCode()
IdentityMapper | Implements the identity function mapping inputs directly to outputs.
IdentityReducer | Performs no reduction writing all input values directly to the output.
InputSampler | Utility for collecting samples and writing a partition file for org.apache.hadoop.mapred.lib.TotalOrderPartitioner
InputSampler.IntervalSampler | Sample from s splits at regular intervals.
InputSampler.RandomSampler | Sample from random points in the input.
InputSampler.Sampler | Interface to sample using an org.apache.hadoop.mapred.InputFormat
InputSampler.SplitSampler | Samples the first n records from s splits.
InverseMapper | A Mapper that swaps keys and values.
KeyFieldBasedPartitioner | Defines a way to partition keys based on certain key fields (also see KeyFieldBasedComparator The key specification supported is of the form -k pos1[ pos2] where pos is of the form f[.c][opts] where f is the number of the key field to use and c is the number of the first character from the beginning of the field.
LongSumReducer | A Reducer that sums long values.
MultipleInputs | This class supports MapReduce jobs that have multiple input paths with a different InputFormat and Mapper for each path
MultipleOutputFormat | This abstract class extends the FileOutputFormat allowing to write the output data to different output files.
MultipleOutputs | The MultipleOutputs class simplifies writting to additional outputs other than the job default output via the `OutputCollector` passed to the `map()` and `reduce()` methods of the `Mapper` and `Reducer` implementations.
MultipleSequenceFileOutputFormat | This class extends the MultipleOutputFormat allowing to write the output data to different output files in sequence file output format.
MultipleTextOutputFormat | This class extends the MultipleOutputFormat allowing to write the output data to different output files in Text output format.
MultithreadedMapRunner | Multithreaded implementation for @link org.apache.hadoop.mapred.MapRunnable.
NLineInputFormat | NLineInputFormat which splits N lines of input as one split.
NullOutputFormat | Consume all outputs and put them in /dev/null.
RegexMapper | A Mapper that extracts text matching a regular expression.
TokenCountMapper | A Mapper that maps text values into pairs.
TotalOrderPartitioner | Partitioner effecting a total order by reading split points from an externally generated source.

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