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## Package org.apache.hadoop.mapreduce

Class Summary
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.
CounterGroup | A group of `Counter`s that logically belong together.
Counters |
ID | A general identifier, which internally stores the id as an integer.
InputFormat<K,V> | `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.
JobStatus | Describes the current status of a job.
JobSubmissionFiles | A utility to manage job submission files. Note that this class is for framework internal usage only and is not to be used by users directly.
MapContext<KEYIN,VALUEIN,KEYOUT,VALUEOUT> | The context that is given to the `Mapper`.
Mapper<KEYIN,VALUEIN,KEYOUT,VALUEOUT> | Maps input key/value pairs to a set of intermediate key/value pairs.
OutputCommitter | `OutputCommitter` describes the commit of task output for a Map-Reduce job.
OutputFormat<K,V> | `OutputFormat` describes the output-specification for a Map-Reduce job.
Partitioner<KEY,VALUE> | Partitions the key space.
RecordReader<KEYIN,VALUEIN> | The record reader breaks the data into key/value pairs for input to the `Mapper`.
RecordWriter<K,V> | `RecordWriter` writes the output <key, value> pairs to an output file.
ReduceContext<KEYIN,VALUEIN,KEYOUT,VALUEOUT> | The context passed to the `Reducer`.
Reducer<KEYIN,VALUEIN,KEYOUT,VALUEOUT> | 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.
TaskID | TaskID represents the immutable and unique identifier for a Map or Reduce Task.
TaskInputOutputContext<KEYIN,VALUEIN,KEYOUT,VALUEOUT> | A context object that allows input and output from the task.

Enum Summary
Job.JobState |
JobACL | Job related ACLs
JobStatus.State | Current state of the job
TaskType | Enum for map, reduce, job-setup, job-cleanup, task-cleanup task types.

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