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See:
Description
Interface Summary | |
InputFormat | An input data format. |
InputFormat.Split | A section of an input file. |
Mapper | Maps input key/value pairs to a set of intermediate key/value pairs. |
OutputCollector | Passed to Mapper and Reducer implementations to collect
output data. |
OutputFormat | An output data format. |
Partitioner | Partitions the key space. |
RecordReader | Reads key/value pairs from an input file InputFormat.Split . |
RecordWriter | Writes key/value pairs to an output file. |
Reducer | Reduces a set of intermediate values which share a key to a smaller set of values. |
Class Summary | |
DefaultMapper | The default Mapper . |
DefaultPartitioner | The default Partitioner . |
DefaultReducer | The default Reducer . |
FileSplit | An InputFormat.Split implementation for sections of files. |
MapReduceJob | Specifies a map/reduce job. |
TextInputFormat | An InputFormat for plain text files. |
A system for scalable, fault-tolerant, distributed computation over large data collections.
Applications implement Mapper
and
Reducer
interfaces. These are submitted
as a MapReduceJob
and are applied to data
stored in a NutchFileSystem
.
See Google's original Map/Reduce paper for background information.
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