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

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

Class and Description
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.
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.
JobConf A map/reduce job configuration.
JobConfigurable That what may be configured.
JobContext
JobID JobID represents the immutable and unique identifier for the job.
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.
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.
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 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.
SequenceFileInputFormat An InputFormat for SequenceFiles.
SequenceFileOutputFormat An OutputFormat that writes SequenceFiles.
SplitLocationInfo
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.
TaskReport A report on the state of a task.

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.