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See:
Description
Class Summary | |
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FieldSelectionMapReduce<K,V> | This class implements a mapper/reducer class that can be used to perform field selections in a manner similar to unix cut. |
HashPartitioner<K2,V2> | Partition keys by their Object.hashCode() . |
IdentityMapper<K,V> | Implements the identity function, mapping inputs directly to outputs. |
IdentityReducer<K,V> | Performs no reduction, writing all input values directly to the output. |
InverseMapper<K,V> | A Mapper that swaps keys and values. |
KeyFieldBasedPartitioner<K2,V2> | |
LongSumReducer<K> | A Reducer that sums long values. |
MultipleOutputFormat<K,V> | This abstract class extends the OutputFormatBase, allowing to write the output data to different output files. |
MultipleSequenceFileOutputFormat<K,V> | This class extends the MultipleOutputFormat, allowing to write the output data to different output files in sequence file output format. |
MultipleTextOutputFormat<K,V> | This class extends the MultipleOutputFormat, allowing to write the output data to different output files in Text output format. |
MultithreadedMapRunner<K1,V1,K2,V2> | Multithreaded implementation for @link org.apache.hadoop.mapred.MapRunnable. |
NLineInputFormat | NLineInputFormat which splits N lines of input as one split. |
NullOutputFormat<K,V> | Consume all outputs and put them in /dev/null. |
RegexMapper<K> | A Mapper that extracts text matching a regular expression. |
TokenCountMapper<K> | A Mapper that maps text values into |
Library of generally useful mappers, reducers, and partitioners.
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