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.examples.terasort This package consists of 3 map/reduce applications for Hadoop to compete in the annual terabyte sort competition. 
org.apache.hadoop.filecache   
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.lib.db org.apache.hadoop.mapred.lib.db Package 
org.apache.hadoop.mapred.pipes Hadoop Pipes allows C++ code to use Hadoop DFS and map/reduce. 
org.apache.hadoop.mapreduce   
org.apache.hadoop.mapreduce.server.jobtracker   
org.apache.hadoop.mapreduce.server.tasktracker   
org.apache.hadoop.mapreduce.server.tasktracker.userlogs   
org.apache.hadoop.mapreduce.split   
org.apache.hadoop.streaming Hadoop Streaming is a utility which allows users to create and run Map-Reduce jobs with any executables (e.g. 
 

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
          Deprecated. Use CombineFileInputFormat instead
MultiFileSplit
          Deprecated. Use CombineFileSplit instead
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.
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.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.examples.terasort
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.
OutputCollector
          Collects the <key, value> pairs output by Mappers and Reducers.
OutputFormat
          OutputFormat describes the output-specification for a Map-Reduce job.
RecordReader
          RecordReader reads <key, value> pairs from an InputSplit.
RecordWriter
          RecordWriter writes the output <key, value> pairs to an output file.
Reporter
          A facility for Map-Reduce applications to report progress and update counters, status information etc.
TextOutputFormat
          An OutputFormat that writes plain text files.
 

Classes in org.apache.hadoop.mapred used by org.apache.hadoop.filecache
InvalidJobConfException
          This exception is thrown when jobconf misses some mendatory attributes or value of some attributes is invalid.
TaskController
          Controls initialization, finalization and clean up of tasks, and also the launching and killing of task JVMs.
 

Classes in org.apache.hadoop.mapred used by org.apache.hadoop.mapred
AdminOperationsProtocol
          Protocol for admin operations.
CleanupQueue
           
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.
FileInputFormat.Counter
           
FileOutputFormat
          A base class for OutputFormat.
FileOutputFormat.Counter
           
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.
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.
JobContext
           
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.
JobInProgress
          JobInProgress maintains all the info for keeping a Job on the straight and narrow.
JobInProgress.Counter
           
JobPriority
          Used to describe the priority of the running job.
JobProfile
          A JobProfile is a MapReduce primitive.
JobQueueInfo
          Class that contains the information regarding the Job Queues which are maintained by the Hadoop Map/Reduce framework.
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.SafeModeAction
          JobTracker SafeMode
JobTracker.State
           
JobTrackerMXBean
          The MXBean interface for JobTrackerInfo
JvmTask
           
Mapper
          Maps input key/value pairs to a set of intermediate key/value pairs.
MapRunnable
          Expert: Generic interface for Mappers.
MapTaskCompletionEventsUpdate
          A class that represents the communication between the tasktracker and child tasks w.r.t the map task completion events.
Operation
          Generic operation that maps to the dependent set of ACLs that drive the authorization of the operation.
OutputCollector
          Collects the <key, value> pairs output by Mappers and Reducers.
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.
RawKeyValueIterator
          RawKeyValueIterator is an iterator used to iterate over the raw keys and values during sort/merge of intermediate data.
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.
Task
          Base class for tasks.
Task.CombinerRunner
           
Task.Counter
           
Task.TaskReporter
           
TaskAttemptContext
           
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
           
TaskController
          Controls initialization, finalization and clean up of tasks, and also the launching and killing of task JVMs.
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.
TaskStatus
          Describes the current status of a task.
TaskStatus.Phase
           
TaskStatus.State
           
TaskTracker
          TaskTracker is a process that starts and tracks MR Tasks in a networked environment.
TaskTrackerMXBean
          MXBean interface for TaskTracker
TaskTrackerStatus
          A TaskTrackerStatus is a MapReduce primitive.
TaskUmbilicalProtocol
          Protocol that task child process uses to contact its parent process.
TIPStatus
          The states of a TaskInProgress as seen by the JobTracker.
Utils.OutputFileUtils.OutputLogFilter
          This class filters log files from directory given It doesnt accept paths having _logs.
 

Classes in org.apache.hadoop.mapred used by org.apache.hadoop.mapred.jobcontrol
JobClient
          JobClient is the primary interface for the user-job to interact with the JobTracker.
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.
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.
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.lib.db
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.
OutputFormat
          OutputFormat describes the output-specification for a Map-Reduce job.
RecordReader
          RecordReader reads <key, value> pairs from an InputSplit.
RecordWriter
          RecordWriter writes the output <key, value> pairs to an output file.
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.mapreduce
ID
          A general identifier, which internally stores the id as an integer.
JobClient
          JobClient is the primary interface for the user-job to interact with the JobTracker.
RawKeyValueIterator
          RawKeyValueIterator is an iterator used to iterate over the raw keys and values during sort/merge of intermediate data.
TaskCompletionEvent
          This is used to track task completion events on job tracker.
 

Classes in org.apache.hadoop.mapred used by org.apache.hadoop.mapreduce.server.jobtracker
JobInProgress
          JobInProgress maintains all the info for keeping a Job on the straight and narrow.
TaskTrackerStatus
          A TaskTrackerStatus is a MapReduce primitive.
 

Classes in org.apache.hadoop.mapred used by org.apache.hadoop.mapreduce.server.tasktracker
Task
          Base class for tasks.
 

Classes in org.apache.hadoop.mapred used by org.apache.hadoop.mapreduce.server.tasktracker.userlogs
TaskController
          Controls initialization, finalization and clean up of tasks, and also the launching and killing of task JVMs.
UserLogCleaner
          This is used only in UserLogManager, to manage cleanup of user logs.
 

Classes in org.apache.hadoop.mapred used by org.apache.hadoop.mapreduce.split
InputSplit
          InputSplit represents the data to be processed by an individual Mapper.
 

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.
Mapper
          Maps input key/value pairs to a set of intermediate key/value pairs.
MapRunnable
          Expert: Generic interface for Mappers.
MapRunner
          Default MapRunnable implementation.
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.
 



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