Uses of Package
org.apache.hadoop.mapreduce

Packages that use org.apache.hadoop.mapreduce

Package	Description
org.apache.hadoop.mapred
org.apache.hadoop.mapred.lib.db
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.jobhistory
org.apache.hadoop.mapreduce.lib.aggregate
org.apache.hadoop.mapreduce.lib.chain
org.apache.hadoop.mapreduce.lib.db
org.apache.hadoop.mapreduce.lib.fieldsel
org.apache.hadoop.mapreduce.lib.input
org.apache.hadoop.mapreduce.lib.jobcontrol
org.apache.hadoop.mapreduce.lib.join
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.protocol
org.apache.hadoop.mapreduce.server.jobtracker
org.apache.hadoop.mapreduce.server.tasktracker
org.apache.hadoop.mapreduce.split
org.apache.hadoop.mapreduce.task
org.apache.hadoop.mapreduce.task.reduce
org.apache.hadoop.mapreduce.tools
org.apache.hadoop.mapreduce.util

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

Class and Description
Cluster Provides a way to access information about the map/reduce cluster.
Cluster.JobTrackerStatus
Counter A named counter that tracks the progress of a map/reduce job.
Counters Counters holds per job/task counters, defined either by the Map-Reduce framework or applications.
ID A general identifier, which internally stores the id as an integer.
InputSplit InputSplit represents the data to be processed by an individual Mapper.
JobACL Job related ACLs
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.
JobStatus Describes the current status of a job.
JobStatus.State Current state of the job
OutputCommitter OutputCommitter describes the commit of task output for a Map-Reduce job.
OutputFormat OutputFormat describes the output-specification for a Map-Reduce job.
QueueInfo Class that contains the information regarding the Job Queues which are maintained by the Hadoop Map/Reduce framework.
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.
Reducer.Context The Context passed on to the Reducer implementations.
StatusReporter
TaskAttemptContext The context for task attempts.
TaskAttemptID TaskAttemptID represents the immutable and unique identifier for a task attempt.
TaskCompletionEvent This is used to track task completion events on job tracker.
TaskID TaskID represents the immutable and unique identifier for a Map or Reduce Task.
TaskReport A report on the state of a task.
TaskType Enum for map, reduce, job-setup, job-cleanup, task-cleanup task types.

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

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

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

Class and Description
Cluster Provides a way to access information about the map/reduce cluster.
Cluster.JobTrackerStatus
ClusterMetrics Status information on the current state of the Map-Reduce cluster.
Counter A named counter that tracks the progress of a map/reduce job.
Counters Counters holds per job/task counters, defined either by the Map-Reduce framework or applications.
FileSystemCounter
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 The job submitter's view of the Job.
Job.JobState
Job.TaskStatusFilter
JobACL Job related ACLs
JobContext A read-only view of the job that is provided to the tasks while they are running.
JobCounter
JobID JobID represents the immutable and unique identifier for the job.
JobPriority Used to describe the priority of the running job.
JobStatus Describes the current status of a job.
JobStatus.State Current state of 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 The Context passed on to the Mapper implementations.
MRJobConfig
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.
QueueAclsInfo Class to encapsulate Queue ACLs for a particular user.
QueueInfo Class that contains the information regarding the Job Queues which are maintained by the Hadoop Map/Reduce framework.
QueueState Enum representing queue state
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 The Context passed on to the Reducer implementations.
TaskAttemptContext The context for task attempts.
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
TaskCounter
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.
TaskReport A report on the state of a task.
TaskTrackerInfo Information about TaskTracker.
TaskType Enum for map, reduce, job-setup, job-cleanup, task-cleanup task types.

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

Class and Description
Counter A named counter that tracks the progress of a map/reduce job.
FileSystemCounter

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

Class and Description
Counters Counters holds per job/task counters, defined either by the Map-Reduce framework or applications.
JobACL Job related ACLs
JobID JobID represents the immutable and unique identifier for the job.
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.
TaskType Enum for map, reduce, job-setup, job-cleanup, task-cleanup task types.

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

Class and Description
Job The job submitter's view of the Job.
Mapper Maps input key/value pairs to a set of intermediate key/value pairs.
Mapper.Context The Context passed on to the Mapper implementations.
Reducer Reduces a set of intermediate values which share a key to a smaller set of values.
Reducer.Context The Context passed on to the Reducer implementations.

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

Class and Description
Job The job submitter's view of the Job.
Mapper Maps input key/value pairs to a set of intermediate key/value pairs.
Mapper.Context The Context passed on to the Mapper implementations.
Reducer Reduces a set of intermediate values which share a key to a smaller set of values.
Reducer.Context The Context passed on to the Reducer implementations.

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

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.
OutputCommitter OutputCommitter describes the commit of task output for a Map-Reduce job.
OutputFormat OutputFormat describes the output-specification for a Map-Reduce job.
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.
TaskAttemptContext The context for task attempts.

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

Class and Description
Mapper Maps input key/value pairs to a set of intermediate key/value pairs.
Mapper.Context The Context passed on to the Mapper implementations.
Reducer Reduces a set of intermediate values which share a key to a smaller set of values.
Reducer.Context The Context passed on to the Reducer implementations.

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

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.
Mapper Maps input key/value pairs to a set of intermediate key/value pairs.
Mapper.Context The Context passed on to the Mapper implementations.
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.jobcontrol

Class and Description
Job The job submitter's view of the Job.
JobID JobID represents the immutable and unique identifier for the job.

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

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.
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

Class and Description
Counter A named counter that tracks the progress of a map/reduce job.
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.
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 The Context passed on to the Mapper implementations.
MRJobConfig
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.
Reducer Reduces a set of intermediate values which share a key to a smaller set of values.
TaskAttemptContext The context for task attempts.
TaskAttemptID TaskAttemptID represents the immutable and unique identifier for a task attempt.
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.output

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.
JobStatus.State Current state of the job
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.
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

Class and Description
InputFormat InputFormat describes the input-specification for a Map-Reduce job.
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.
Partitioner Partitions the key space.

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

Class and Description
Counter A named counter that tracks the progress of a map/reduce job.
InputFormat InputFormat describes the input-specification for a Map-Reduce job.
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.
Mapper Maps input key/value pairs to a set of intermediate key/value pairs.
MRJobConfig
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.
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 The Context passed on to the Reducer implementations.
TaskAttemptContext The context for task attempts.
TaskAttemptID TaskAttemptID represents the immutable and unique identifier for a task attempt.
TaskInputOutputContext A context object that allows input and output from the task.

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

Class and Description
Cluster.JobTrackerStatus
ClusterMetrics Status information on the current state of the Map-Reduce cluster.
Counters Counters holds per job/task counters, defined either by the Map-Reduce framework or applications.
JobID JobID represents the immutable and unique identifier for the job.
JobStatus Describes the current status of a job.
QueueAclsInfo Class to encapsulate Queue ACLs for a particular user.
QueueInfo Class that contains the information regarding the Job Queues which are maintained by the Hadoop Map/Reduce framework.
TaskAttemptID TaskAttemptID represents the immutable and unique identifier for a task attempt.
TaskCompletionEvent This is used to track task completion events on job tracker.
TaskReport A report on the state of a task.
TaskTrackerInfo Information about TaskTracker.
TaskType Enum for map, reduce, job-setup, job-cleanup, task-cleanup task types.

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

Class and Description
MRConfig Place holder for cluster level configuration keys.

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

Class and Description
MRConfig Place holder for cluster level configuration keys.

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

Class and Description
InputSplit InputSplit represents the data to be processed by an individual Mapper.
JobID JobID represents the immutable and unique identifier for the job.

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

Class and Description
Counter A named counter that tracks the progress of a map/reduce job.
InputFormat InputFormat describes the input-specification for a Map-Reduce job.
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.
MapContext The context that is given to the Mapper.
Mapper Maps input key/value pairs to a set of intermediate key/value pairs.
MRJobConfig
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.
ReduceContext.ValueIterator Iterator to iterate over values for a given group of records.
Reducer Reduces a set of intermediate values which share a key to a smaller set of values.
StatusReporter
TaskAttemptContext The context for task attempts.
TaskAttemptID TaskAttemptID represents the immutable and unique identifier for a task attempt.
TaskInputOutputContext A context object that allows input and output from the task.

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

Class and Description
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.tools

Class and Description
Cluster Provides a way to access information about the map/reduce cluster.
Counters Counters holds per job/task counters, defined either by the Map-Reduce framework or applications.
Job The job submitter's view of the Job.
JobStatus Describes the current status of a job.
TaskAttemptID TaskAttemptID represents the immutable and unique identifier for a task attempt.

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

Class and Description
Counter A named counter that tracks the progress of a map/reduce job.
Counters Counters holds per job/task counters, defined either by the Map-Reduce framework or applications.