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See:
Description
Class Summary | |
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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. |
InverseMapper | A Mapper that swaps keys and values. |
KeyFieldBasedPartitioner | |
LongSumReducer | A Reducer that sums long values. |
MultithreadedMapRunner | Multithreaded implementation for @link org.apache.hadoop.mapred.MapRunnable. |
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 |
Library of generally useful mappers, reducers, and partitioners.
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