| 类 | 说明 |
|---|---|
| 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
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.
|
| JobStatus |
Describes the current status of a job.
|
| JobSubmissionFiles |
A utility to manage job submission files.
|
| 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.
|
| 枚举 | 说明 |
|---|---|
| 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.
|
Copyright © 2009 The Apache Software Foundation