Uses of Package
org.apache.hadoop.mapred

Packages that use org.apache.hadoop.mapred

Package	Description
org.apache.hadoop.mapred
org.apache.hadoop.mapred.jobcontrol
org.apache.hadoop.mapred.join
org.apache.hadoop.mapred.lib
org.apache.hadoop.mapred.lib.aggregate
org.apache.hadoop.mapred.lib.db
org.apache.hadoop.mapred.pipes
org.apache.hadoop.mapreduce
org.apache.hadoop.mapreduce.checkpoint
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.security
org.apache.hadoop.mapreduce.split
org.apache.hadoop.mapreduce.task
org.apache.hadoop.mapreduce.task.reduce

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

Class and Description
AMFeedback This class is a simple struct to include both the taskFound information and a possible preemption request coming from the AM.
ClusterStatus Status information on the current state of the Map-Reduce cluster.
ClusterStatus.BlackListInfo Class which encapsulates information about a blacklisted tasktracker.
Counters A set of named counters.
Counters.Counter A counter record, comprising its name and value.
Counters.CountersExceededException Counter exception thrown when the number of counters exceed the limit
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 Deprecated.
FileOutputFormat A base class for OutputFormat.
FileOutputFormat.Counter Deprecated.
FileSplit A section of an input file.
IFile.Reader IFile.Reader to read intermediate map-outputs.
IFile.Writer IFile.Writer to write out intermediate map-outputs.
IndexRecord
InputFormat InputFormat describes the input-specification for a Map-Reduce job.
InputSplit InputSplit represents the data to be processed by an individual Mapper.
InputSplitWithLocationInfo
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
JobID JobID represents the immutable and unique identifier for the job.
JobInProgress.Counter Deprecated. Provided for compatibility. Use JobCounter instead.
JobPriority Used to describe the priority of the running job.
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.State State is no longer used since M/R 2.x.
JvmTask Task abstraction that can be serialized, implements the writable interface.
MapOutputCollector
MapOutputCollector.Context
MapOutputFile Manipulate the working area for the transient store for maps and reduces.
Mapper Maps input key/value pairs to a set of intermediate key/value pairs.
MapRunnable Expert: Generic interface for Mappers.
MapTask A Map task.
MapTaskCompletionEventsUpdate A class that represents the communication between the tasktracker and child tasks w.r.t the map task completion events.
Master.State
Merger.Segment
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.
QueueACL Enum representing an AccessControlList that drives set of operations that can be performed on a queue.
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.FilterBase base class for Filters
SequenceFileInputFormat An InputFormat for SequenceFiles.
SequenceFileOutputFormat An OutputFormat that writes SequenceFiles.
ShuffleConsumerPlugin.Context
SplitLocationInfo
Task Base class for tasks.
Task.CombineOutputCollector OutputCollector for the combiner.
Task.CombinerRunner
Task.Counter Deprecated. Provided for compatibility. Use TaskCounter instead.
Task.TaskReporter
Task.TaskReporter.TaskLimitException exception thrown when the task exceeds some configured limits.
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
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
TaskUmbilicalProtocol Protocol that task child process uses to contact its parent process.
TIPStatus The states of a Tasks.
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

Class and Description
JobClient JobClient is the primary interface for the user-job to interact with the cluster.
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

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.
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

Class and Description
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

Class and Description
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

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.
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

Class and Description
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

Class and Description
ID A general identifier, which internally stores the id as an integer.
SplitLocationInfo
TaskCompletionEvent This is used to track task completion events on job tracker.
TIPStatus The states of a Tasks.

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

Class and Description
Counters A set of named counters.

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

Class and Description
Counters.CountersExceededException Counter exception thrown when the number of counters exceed the limit

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

Class and Description
JobConf A map/reduce job configuration.
JobPriority Used to describe the priority of the running job.

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

Class and Description
JobConf A map/reduce job configuration.

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

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

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

Class and Description
RawKeyValueIterator RawKeyValueIterator is an iterator used to iterate over the raw keys and values during sort/merge of intermediate data.

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

Class and Description
Counters.Counter A counter record, comprising its name and value.
IFile.Reader IFile.Reader to read intermediate map-outputs.
IFile.Writer IFile.Writer to write out intermediate map-outputs.
IFileInputStream A checksum input stream, used for IFiles.
JobConf A map/reduce job configuration.
MapOutputFile Manipulate the working area for the transient store for maps and reduces.
RawKeyValueIterator RawKeyValueIterator is an iterator used to iterate over the raw keys and values during sort/merge of intermediate data.
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.
ShuffleConsumerPlugin ShuffleConsumerPlugin for serving Reducers.
ShuffleConsumerPlugin.Context
Task.CombineOutputCollector OutputCollector for the combiner.
TaskCompletionEvent This is used to track task completion events on job tracker.
TaskStatus Describes the current status of a task.