Package | Description |
---|---|
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 |
Class and Description |
---|
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 |
Class and Description |
---|
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.
|
Class and Description |
---|
Counter
A named counter that tracks the progress of a map/reduce job.
|
CounterGroup
A group of
Counter s 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.
|
Class and Description |
---|
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.
|
Class and Description |
---|
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 |
Class and Description |
---|
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.
|
Class and Description |
---|
Partitioner
Partitions the key space.
|
Class and Description |
---|
Reducer
Reduces a set of intermediate values which share a key to a smaller set of
values.
|
Reducer.Context |
Copyright © 2010 The Apache Software Foundation