Uses of Package
org.apache.hadoop.mapred

Packages that use org.apache.hadoop.mapred

org.apache.hadoop.contrib.utils.join
org.apache.hadoop.examples	Hadoop example code.
org.apache.hadoop.io	Generic i/o code for use when reading and writing data to the network, to databases, and to files.
org.apache.hadoop.mapred	A system for scalable, fault-tolerant, distributed computation over large data collections.
org.apache.hadoop.mapred.jobcontrol	Utilities for managing dependent jobs.
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.streaming
org.apache.hadoop.tools
org.apache.hadoop.util	Common utilities.

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
Passed to Mapper and Reducer implementations to collect output data.

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

Reporter
Passed to application code to permit alteration of status.

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

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
Passed to Mapper and Reducer implementations to collect output data.

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

Reporter
Passed to application code to permit alteration of status.

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

JobConf
A map/reduce job configuration.

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

ClusterStatus
Summarizes the size and current state of the cluster.

Counters
A set of named counters.

Counters.Group
Represents a group of counters, comprising the 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 InputFormat.

FileSplit
A section of an input file.

InputFormat
An input data format.

InputSplit
The description of the data for a single map task.

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.

JobProfile
A JobProfile is a MapReduce primitive.

JobStatus
Describes the current status of a job.

JobSubmissionProtocol
Protocol that a JobClient and the central JobTracker use to communicate.

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

LineRecordReader
Treats keys as offset in file and value as line.

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

MapRunnable
Expert: Permits greater control of map processing.

OutputCollector
Passed to Mapper and Reducer implementations to collect output data.

OutputFormat
An output data format.

OutputFormatBase
A base class for OutputFormat.

Partitioner
Partitions the key space.

RecordReader
Reads key/value pairs from an input file FileSplit.

RecordWriter
Writes 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
Passed to application code to permit alteration of status.

RunningJob
Includes details on a running MapReduce job.

SequenceFileInputFilter.Filter
filter interface

SequenceFileInputFilter.FilterBase
base calss for Filters

SequenceFileInputFormat
An InputFormat for SequenceFiles.

SequenceFileRecordReader
An RecordReader for SequenceFiles.

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

TaskCompletionEvent.Status

TaskReport
A report on the state of a task.

TextInputFormat
An InputFormat for plain text files.

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

JobConf
A map/reduce job configuration.

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

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: Permits greater control of map processing.

OutputCollector
Passed to Mapper and Reducer implementations to collect output data.

OutputFormat
An output data format.

Partitioner
Partitions the key space.

RecordReader
Reads key/value pairs from an input file FileSplit.

RecordWriter
Writes 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
Passed to application code to permit alteration of status.

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
Passed to Mapper and Reducer implementations to collect output data.

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

Reporter
Passed to application code to permit alteration of status.

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

FileInputFormat
A base class for InputFormat.

FileSplit
A section of an input file.

InputFormat
An input data format.

InputSplit
The description of the data for a single map task.

JobClient
JobClient interacts with the JobTracker network interface.

JobConf
A map/reduce job configuration.

JobConfigurable
That what may be configured.

KeyValueLineRecordReader
This class treats a line in the input as a key/value pair separated by a separator character.

KeyValueTextInputFormat
An InputFormat for plain text files.

LineRecordReader
Treats keys as offset in file and value as line.

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

OutputCollector
Passed to Mapper and Reducer implementations to collect output data.

OutputFormat
An output data format.

OutputFormatBase
A base class for OutputFormat.

RecordReader
Reads key/value pairs from an input file FileSplit.

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

Reporter
Passed to application code to permit alteration of status.

RunningJob
Includes details on a running MapReduce job.

SequenceFileRecordReader
An RecordReader for SequenceFiles.

TextInputFormat
An InputFormat for plain text files.

TextOutputFormat
An OutputFormat that writes plain text files.

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

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
Passed to Mapper and Reducer implementations to collect output data.

Reporter
Passed to application code to permit alteration of status.

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

JobClient
JobClient interacts with the JobTracker network interface.

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
Passed to Mapper and Reducer implementations to collect output data.

Reporter
Passed to application code to permit alteration of status.