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## Uses of Package
org.apache.hadoop.mapreduce

Packages that use org.apache.hadoop.mapreduce
org.apache.hadoop.examples | Hadoop example code.
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.mapreduce |
org.apache.hadoop.mapreduce.lib.input |
org.apache.hadoop.mapreduce.lib.map |
org.apache.hadoop.mapreduce.lib.output |
org.apache.hadoop.mapreduce.lib.partition |
org.apache.hadoop.mapreduce.lib.reduce |

Classes in org.apache.hadoop.mapreduce used by org.apache.hadoop.examples
Mapper Maps input key/value pairs to a set of intermediate key/value pairs.
Mapper.Context
Partitioner Partitions the key space.
Reducer Reduces a set of intermediate values which share a key to a smaller set of values.
Reducer.Context

Classes in org.apache.hadoop.mapreduce used by org.apache.hadoop.mapred
Counter A named counter that tracks the progress of a map/reduce job.
ID A general identifier, which internally stores the id as an integer.
InputSplit `InputSplit` represents the data to be processed by an individual `Mapper`.
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.
OutputCommitter `OutputCommitter` describes the commit of task output for a Map-Reduce job.
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.

Classes in org.apache.hadoop.mapreduce used by org.apache.hadoop.mapreduce
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 `InputFormat` describes the input-specification for a Map-Reduce job.
InputSplit `InputSplit` represents the data to be processed by an individual `Mapper`.
Job.JobState
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.
MapContext The context that is given to the `Mapper`.
Mapper Maps input key/value pairs to a set of intermediate key/value pairs.
Mapper.Context
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 The record reader breaks the data into key/value pairs for input to the `Mapper`.
RecordWriter `RecordWriter` writes the output <key, value> pairs to an output file.
ReduceContext The context passed to the `Reducer`.
Reducer Reduces a set of intermediate values which share a key to a smaller set of values.
Reducer.Context
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 A context object that allows input and output from the task.

Classes in org.apache.hadoop.mapreduce used by org.apache.hadoop.mapreduce.lib.input
InputFormat `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.
RecordReader The record reader breaks the data into key/value pairs for input to the `Mapper`.
TaskAttemptContext The context for task attempts.

Classes in org.apache.hadoop.mapreduce used by org.apache.hadoop.mapreduce.lib.map
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.
Mapper Maps input key/value pairs to a set of intermediate key/value pairs.
Mapper.Context

Classes in org.apache.hadoop.mapreduce used by org.apache.hadoop.mapreduce.lib.output
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.
OutputCommitter `OutputCommitter` describes the commit of task output for a Map-Reduce job.
OutputFormat `OutputFormat` describes the output-specification for a Map-Reduce job.
RecordWriter `RecordWriter` writes the output <key, value> pairs to an output file.
TaskAttemptContext The context for task attempts.
TaskInputOutputContext A context object that allows input and output from the task.

Classes in org.apache.hadoop.mapreduce used by org.apache.hadoop.mapreduce.lib.partition
Partitioner Partitions the key space.

Classes in org.apache.hadoop.mapreduce used by org.apache.hadoop.mapreduce.lib.reduce
Reducer Reduces a set of intermediate values which share a key to a smaller set of values.
Reducer.Context

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