Hadoop 2.6.0-mr1-cdh5.12.1 API

Core 
Package Description
org.apache.hadoop.filecache  
org.apache.hadoop.mapred
A software framework for easily writing applications which process vast amounts of data (multi-terabyte data-sets) parallelly on large clusters (thousands of nodes) built of commodity hardware in a reliable, fault-tolerant manner.
org.apache.hadoop.mapred.jobcontrol
Utilities for managing dependent jobs.
org.apache.hadoop.mapred.join
Given a set of sorted datasets keyed with the same class and yielding equal partitions, it is possible to effect a join of those datasets prior to the map.
org.apache.hadoop.mapred.lib
Library of generally useful mappers, reducers, and partitioners.
org.apache.hadoop.mapred.lib.aggregate
Classes for performing various counting and aggregations.
org.apache.hadoop.mapred.lib.db
org.apache.hadoop.mapred.lib.db Package
org.apache.hadoop.mapred.pipes
Hadoop Pipes allows C++ code to use Hadoop DFS and map/reduce.
org.apache.hadoop.mapred.tools  
org.apache.hadoop.mapreduce  
org.apache.hadoop.mapreduce.counters
This package contains the implementations of different types of map-reduce counters.
org.apache.hadoop.mapreduce.lib.db
org.apache.hadoop.mapred.lib.db Package
org.apache.hadoop.mapreduce.lib.fieldsel  
org.apache.hadoop.mapreduce.lib.input  
org.apache.hadoop.mapreduce.lib.jobcontrol
Utilities for managing dependent jobs.
org.apache.hadoop.mapreduce.lib.map  
org.apache.hadoop.mapreduce.lib.output  
org.apache.hadoop.mapreduce.lib.partition  
org.apache.hadoop.mapreduce.lib.reduce  
org.apache.hadoop.mapreduce.security  
org.apache.hadoop.mapreduce.security.token  
org.apache.hadoop.mapreduce.security.token.delegation  
org.apache.hadoop.mapreduce.server.jobtracker  
org.apache.hadoop.mapreduce.server.tasktracker  
org.apache.hadoop.mapreduce.server.tasktracker.userlogs  
org.apache.hadoop.mapreduce.split  
org.apache.hadoop.mapreduce.task  
org.apache.hadoop.mapreduce.util  
org.apache.hadoop.mr1security  
org.apache.hadoop.mr1security.authorize  
org.apache.hadoop.mr1tools  
org.apache.hadoop.typedbytes
Typed bytes are sequences of bytes in which the first byte is a type code.
org.apache.hadoop.util  
Examples 
Package Description
org.apache.hadoop.examples
Hadoop example code.
org.apache.hadoop.examples.dancing
This package is a distributed implementation of Knuth's dancing links algorithm that can run under Hadoop.
org.apache.hadoop.examples.terasort
This package consists of 3 map/reduce applications for Hadoop to compete in the annual terabyte sort competition.
contrib: Streaming 
Package Description
org.apache.hadoop.streaming
Hadoop Streaming is a utility which allows users to create and run Map-Reduce jobs with any executables (e.g.
org.apache.hadoop.streaming.io  
contrib: DataJoin 
Package Description
org.apache.hadoop.contrib.utils.join  
contrib: Index 
Package Description
org.apache.hadoop.contrib.index.example  
org.apache.hadoop.contrib.index.lucene  
org.apache.hadoop.contrib.index.main  
org.apache.hadoop.contrib.index.mapred  
contrib: FailMon 
Package Description
org.apache.hadoop.contrib.failmon  

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