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Class Summary | |
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AggregateWordCount | This is an example Aggregated Hadoop Map/Reduce application. It reads the text input files, breaks each line into words and counts them. The output is a locally sorted list of words and the count of how often they occurred. To run: bin/hadoop jar hadoop-*-examples.jar aggregatewordcount in-dir out-dir numOfReducers textinputformat |
AggregateWordHistogram | This is an example Aggregated Hadoop Map/Reduce application. Computes the histogram of the words in the input texts. To run: bin/hadoop jar hadoop-*-examples.jar aggregatewordhist in-dir out-dir numOfReducers textinputformat |
ExampleDriver | A description of an example program based on its class and a human-readable description. |
Grep | |
Join | This is the trivial map/reduce program that does absolutely nothing other than use the framework to fragment and sort the input values. To run: bin/hadoop jar build/hadoop-examples.jar join [-m maps] [-r reduces] [-inFormat input format class] [-outFormat output format class] [-outKey output key class] [-outValue output value class] [-joinOp] [in-dir]* in-dir out-dir |
RandomTextWriter | This program uses map/reduce to just run a distributed job where there is no interaction between the tasks and each task writes a large unsorted random sequence of words.To run: bin/hadoop jar hadoop-${version}-examples.jar randomtextwriter [-outFormat output format class] output |
RandomWriter | This program uses map/reduce to just run a distributed job where there is no interaction between the tasks and each task write a large unsorted random binary sequence file of BytesWritable.To run: bin/hadoop jar hadoop-${version}-examples.jar randomwriter [-outFormat output format class] output |
Sort<K,V> | This is the trivial map/reduce program that does absolutely nothing other than use the framework to fragment and sort the input values.To run: bin/hadoop jar build/hadoop-examples.jar sort [-m maps] [-r reduces] [-inFormat input format class] [-outFormat output format class] [-outKey output key class] [-outValue output value class] [-totalOrder pcnt num samples max splits] in-dir out-dir |
WordCount | This is an example Hadoop Map/Reduce application. |