Package org.apache.hadoop.examples

Hadoop example code.

See:
Description

Class Summary

AggregateWordCount	This is an example Aggregated Hadoop Map/Reduce application.
AggregateWordCount.WordCountPlugInClass
AggregateWordHistogram	This is an example Aggregated Hadoop Map/Reduce application.
AggregateWordHistogram.AggregateWordHistogramPlugin
DBCountPageView	This is a demonstrative program, which uses DBInputFormat for reading the input data from a database, and DBOutputFormat for writing the data to the database.
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.
MultiFileWordCount	MultiFileWordCount is an example to demonstrate the usage of MultiFileInputFormat.
MultiFileWordCount.MapClass	This Mapper is similar to the one in MultiFileWordCount.MapClass.
MultiFileWordCount.MultiFileLineRecordReader	RecordReader is responsible from extracting records from the InputSplit.
MultiFileWordCount.MyInputFormat	To use MultiFileInputFormat, one should extend it, to return a (custom) RecordReader.
MultiFileWordCount.WordOffset	This record keeps <filename,offset> pairs.
PiEstimator	A Map-reduce program to estimate the value of Pi using quasi-Monte Carlo method.
PiEstimator.PiMapper	Mapper class for Pi estimation.
PiEstimator.PiReducer	Reducer class for Pi estimation.
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.
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.
SecondarySort	This is an example Hadoop Map/Reduce application.
SecondarySort.FirstGroupingComparator	Compare only the first part of the pair, so that reduce is called once for each value of the first part.
SecondarySort.FirstPartitioner	Partition based on the first part of the pair.
SecondarySort.IntPair	Define a pair of integers that are writable.
SecondarySort.IntPair.Comparator	A Comparator that compares serialized IntPair.
SecondarySort.MapClass	Read two integers from each line and generate a key, value pair as ((left, right), right).
SecondarySort.Reduce	A reducer class that just emits the sum of the input values.
SleepJob	Dummy class for testing MR framefork.
SleepJob.EmptySplit
SleepJob.SleepInputFormat
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.
WordCount
WordCount.IntSumReducer
WordCount.TokenizerMapper

Package org.apache.hadoop.examples Description

Hadoop example code.