Uses of Package
org.apache.hadoop.mapreduce

Packages that use org.apache.hadoop.mapreduce

org.apache.hadoop.examples	Hadoop example code.
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.mapreduce
org.apache.hadoop.mapreduce.lib.input
org.apache.hadoop.mapreduce.lib.map
org.apache.hadoop.mapreduce.lib.output
org.apache.hadoop.mapreduce.lib.partition
org.apache.hadoop.mapreduce.lib.reduce

Classes in org.apache.hadoop.mapreduce used by org.apache.hadoop.examples

Mapper
Maps input key/value pairs to a set of intermediate key/value pairs.

Mapper.Context

Partitioner
Partitions the key space.

Reducer
Reduces a set of intermediate values which share a key to a smaller set of values.

Reducer.Context

Classes in org.apache.hadoop.mapreduce used by org.apache.hadoop.mapred

Counter
A named counter that tracks the progress of a map/reduce job.

ID
A general identifier, which internally stores the id as an integer.

InputSplit
InputSplit represents the data to be processed by an individual Mapper.

JobContext
A read-only view of the job that is provided to the tasks while they are running.

JobID
JobID represents the immutable and unique identifier for the job.

OutputCommitter
OutputCommitter describes the commit of task output for a Map-Reduce job.

TaskAttemptContext
The context for task attempts.

TaskAttemptID
TaskAttemptID represents the immutable and unique identifier for a task attempt.

TaskID
TaskID represents the immutable and unique identifier for a Map or Reduce Task.

Classes in org.apache.hadoop.mapreduce used by org.apache.hadoop.mapreduce

Counter
A named counter that tracks the progress of a map/reduce job.

CounterGroup
A group of Counters that logically belong together.

Counters

ID
A general identifier, which internally stores the id as an integer.

InputFormat
InputFormat describes the input-specification for a Map-Reduce job.

InputSplit
InputSplit represents the data to be processed by an individual Mapper.

Job.JobState

JobContext
A read-only view of the job that is provided to the tasks while they are running.

JobID
JobID represents the immutable and unique identifier for the job.

MapContext
The context that is given to the Mapper.

Mapper
Maps input key/value pairs to a set of intermediate key/value pairs.

Mapper.Context

OutputCommitter
OutputCommitter describes the commit of task output for a Map-Reduce job.

OutputFormat
OutputFormat describes the output-specification for a Map-Reduce job.

Partitioner
Partitions the key space.

RecordReader
The record reader breaks the data into key/value pairs for input to the Mapper.

RecordWriter
RecordWriter writes the output <key, value> pairs to an output file.

ReduceContext
The context passed to the Reducer.

Reducer
Reduces a set of intermediate values which share a key to a smaller set of values.

Reducer.Context

StatusReporter

TaskAttemptContext
The context for task attempts.

TaskAttemptID
TaskAttemptID represents the immutable and unique identifier for a task attempt.

TaskID
TaskID represents the immutable and unique identifier for a Map or Reduce Task.

TaskInputOutputContext
A context object that allows input and output from the task.

Classes in org.apache.hadoop.mapreduce used by org.apache.hadoop.mapreduce.lib.input

InputFormat
InputFormat describes the input-specification for a Map-Reduce job.

InputSplit
InputSplit represents the data to be processed by an individual Mapper.

Job
The job submitter's view of the Job.

JobContext
A read-only view of the job that is provided to the tasks while they are running.

RecordReader
The record reader breaks the data into key/value pairs for input to the Mapper.

TaskAttemptContext
The context for task attempts.

Classes in org.apache.hadoop.mapreduce used by org.apache.hadoop.mapreduce.lib.map

Job
The job submitter's view of the Job.

JobContext
A read-only view of the job that is provided to the tasks while they are running.

Mapper
Maps input key/value pairs to a set of intermediate key/value pairs.

Mapper.Context

Classes in org.apache.hadoop.mapreduce used by org.apache.hadoop.mapreduce.lib.output

Job
The job submitter's view of the Job.

JobContext
A read-only view of the job that is provided to the tasks while they are running.

OutputCommitter
OutputCommitter describes the commit of task output for a Map-Reduce job.

OutputFormat
OutputFormat describes the output-specification for a Map-Reduce job.

RecordWriter
RecordWriter writes the output <key, value> pairs to an output file.

TaskAttemptContext
The context for task attempts.

TaskInputOutputContext
A context object that allows input and output from the task.

Classes in org.apache.hadoop.mapreduce used by org.apache.hadoop.mapreduce.lib.partition

Partitioner
Partitions the key space.

Classes in org.apache.hadoop.mapreduce used by org.apache.hadoop.mapreduce.lib.reduce

Reducer
Reduces a set of intermediate values which share a key to a smaller set of values.

Reducer.Context