Uses of Package
org.apache.hadoop.mapred

Packages that use org.apache.hadoop.mapred

org.apache.hadoop.contrib.index.example
org.apache.hadoop.contrib.index.mapred
org.apache.hadoop.contrib.utils.join
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.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.pipes	Hadoop Pipes allows C++ code to use Hadoop DFS and map/reduce.
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.util	Common utilities.

Classes in org.apache.hadoop.mapred used by org.apache.hadoop.contrib.index.example

FileInputFormat
A base class for file-based InputFormat.

FileSplit
A section of an input file.

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

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

JobConf
A map/reduce job configuration.

JobConfigurable
That what may be configured.

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

OutputCollector
Collects the <key, value> pairs output by Mappers and Reducers.

RecordReader
RecordReader reads <key, value> pairs from an InputSplit.

Reporter
A facility for Map-Reduce applications to report progress and update counters, status information etc.

Classes in org.apache.hadoop.mapred used by org.apache.hadoop.contrib.index.mapred

FileOutputFormat
A base class for OutputFormat.

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

JobConf
A map/reduce job configuration.

JobConfigurable
That what may be configured.

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

MapReduceBase
Base class for Mapper and Reducer implementations.

OutputCollector
Collects the <key, value> pairs output by Mappers and Reducers.

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

Partitioner
Partitions the key space.

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

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

Reporter
A facility for Map-Reduce applications to report progress and update counters, status information etc.

Classes in org.apache.hadoop.mapred used by org.apache.hadoop.contrib.utils.join

JobConf
A map/reduce job configuration.

JobConfigurable
That what may be configured.

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

OutputCollector
Collects the <key, value> pairs output by Mappers and Reducers.

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

Reporter
A facility for Map-Reduce applications to report progress and update counters, status information etc.

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

FileInputFormat
A base class for file-based InputFormat.

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

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

JobConf
A map/reduce job configuration.

JobConfigurable
That what may be configured.

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

MapReduceBase
Base class for Mapper and Reducer implementations.

MultiFileInputFormat
An abstract InputFormat that returns MultiFileSplit's in MultiFileInputFormat.getSplits(JobConf, int) method.

MultiFileSplit
A sub-collection of input files.

OutputCollector
Collects the <key, value> pairs output by Mappers and Reducers.

Partitioner
Partitions the key space.

RecordReader
RecordReader reads <key, value> pairs from an InputSplit.

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

Reporter
A facility for Map-Reduce applications to report progress and update counters, status information etc.

Classes in org.apache.hadoop.mapred used by org.apache.hadoop.examples.dancing

JobConf
A map/reduce job configuration.

JobConfigurable
That what may be configured.

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

MapReduceBase
Base class for Mapper and Reducer implementations.

OutputCollector
Collects the <key, value> pairs output by Mappers and Reducers.

Reporter
A facility for Map-Reduce applications to report progress and update counters, status information etc.

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

ClusterStatus
Status information on the current state of the Map-Reduce cluster.

Counters
A set of named counters.

Counters.Counter
A counter record, comprising its name and value.

Counters.Group
Group of counters, comprising of counters from a particular counter Enum class.

FileAlreadyExistsException
Used when target file already exists for any operation and is not configured to be overwritten.

FileInputFormat
A base class for file-based InputFormat.

FileOutputFormat
A base class for OutputFormat.

FileSplit
A section of an input file.

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.

InvalidJobConfException
This exception is thrown when jobconf misses some mendatory attributes or value of some attributes is invalid.

JobClient.TaskStatusFilter

JobConf
A map/reduce job configuration.

JobConfigurable
That what may be configured.

JobHistory.JobInfo
Helper class for logging or reading back events related to job start, finish or failure.

JobHistory.Keys
Job history files contain key="value" pairs, where keys belong to this enum.

JobHistory.Listener
Callback interface for reading back log events from JobHistory.

JobHistory.RecordTypes
Record types are identifiers for each line of log in history files.

JobHistory.Task
Helper class for logging or reading back events related to Task's start, finish or failure.

JobHistory.TaskAttempt
Base class for Map and Reduce TaskAttempts.

JobHistory.Values
This enum contains some of the values commonly used by history log events.

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

JobPriority
Used to describe the priority of the running job.

JobProfile
A JobProfile is a MapReduce primitive.

JobStatus
Describes the current status of a job.

JobTracker
JobTracker is the central location for submitting and tracking MR jobs in a network environment.

JobTracker.State

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

MapRunnable
Expert: Generic interface for Mappers.

OutputCollector
Collects the <key, value> pairs output by Mappers and Reducers.

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

Partitioner
Partitions the key space.

RecordReader
RecordReader reads <key, value> pairs from an InputSplit.

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

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

Reporter
A facility for Map-Reduce applications to report progress and update counters, status information etc.

RunningJob
RunningJob is the user-interface to query for details on a running Map-Reduce job.

SequenceFileInputFilter.Filter
filter interface

SequenceFileInputFilter.FilterBase
base class for Filters

SequenceFileInputFormat
An InputFormat for SequenceFiles.

SequenceFileOutputFormat
An OutputFormat that writes SequenceFiles.

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

TaskCompletionEvent
This is used to track task completion events on job tracker.

TaskCompletionEvent.Status

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

TaskLog.LogName
The filter for userlogs.

TaskReport
A report on the state of a task.

TaskTracker.TaskTrackerMetrics

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

JobConf
A map/reduce job configuration.

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

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

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

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

JobConf
A map/reduce job configuration.

RecordReader
RecordReader reads <key, value> pairs from an InputSplit.

Reporter
A facility for Map-Reduce applications to report progress and update counters, status information etc.

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

FileInputFormat
A base class for file-based InputFormat.

FileOutputFormat
A base class for OutputFormat.

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

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

JobConf
A map/reduce job configuration.

JobConfigurable
That what may be configured.

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

MapReduceBase
Base class for Mapper and Reducer implementations.

MapRunnable
Expert: Generic interface for Mappers.

OutputCollector
Collects the <key, value> pairs output by Mappers and Reducers.

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

Partitioner
Partitions the key space.

RecordReader
RecordReader reads <key, value> pairs from an InputSplit.

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

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

Reporter
A facility for Map-Reduce applications to report progress and update counters, status information etc.

Classes in org.apache.hadoop.mapred used by org.apache.hadoop.mapred.lib.aggregate

JobConf
A map/reduce job configuration.

JobConfigurable
That what may be configured.

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

OutputCollector
Collects the <key, value> pairs output by Mappers and Reducers.

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

Reporter
A facility for Map-Reduce applications to report progress and update counters, status information etc.

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

JobConf
A map/reduce job configuration.

RunningJob
RunningJob is the user-interface to query for details on a running Map-Reduce job.

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

FileInputFormat
A base class for file-based InputFormat.

FileSplit
A section of an input file.

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

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

JobClient
JobClient is the primary interface for the user-job to interact with the JobTracker.

JobConf
A map/reduce job configuration.

JobConfigurable
That what may be configured.

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

KeyValueTextInputFormat
An InputFormat for plain text files.

LineRecordReader.LineReader
A class that provides a line reader from an input stream.

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

OutputCollector
Collects the <key, value> pairs output by Mappers and Reducers.

RecordReader
RecordReader reads <key, value> pairs from an InputSplit.

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

Reporter
A facility for Map-Reduce applications to report progress and update counters, status information etc.

RunningJob
RunningJob is the user-interface to query for details on a running Map-Reduce job.

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

JobConf
A map/reduce job configuration.