Uses of Package
org.apache.hadoop.mapred

Packages that use org.apache.hadoop.mapred
org.apache.hadoop.abacus Hadoop based Abacus is a specialization of map/reduce framework, specilizing for performing various counting and aggregations. 
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.streaming   
org.apache.hadoop.tools   
org.apache.hadoop.util Common utilities. 
 

Classes in org.apache.hadoop.mapred used by org.apache.hadoop.abacus
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.
FileSplit
          A section of an input file.
InputFormat
          An input data format.
InputFormatBase
          A base class for InputFormat.
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.
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.
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.
TaskCompletionEvent
          This is used to track task completion events on job tracker.
TaskCompletionEvent.Status
           
TaskReport
          A report on the state of a task.
 

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.
Partitioner
          Partitions the key space.
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.
 

Classes in org.apache.hadoop.mapred used by org.apache.hadoop.streaming
FileSplit
          A section of an input file.
InputFormat
          An input data format.
InputFormatBase
          A base class for InputFormat.
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.
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.
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.
TextInputFormat
          An InputFormat for 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.
 



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