|
Class Summary |
| Counter |
A named counter that tracks the progress of a map/reduce job. |
| CounterGroup |
A group of Counters 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. |
| 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. |