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See:
Description
Interface Summary | |
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JobContext | A read-only view of the job that is provided to the tasks while they are running. |
MapContext<KEYIN,VALUEIN,KEYOUT,VALUEOUT> | The context that is given to the Mapper . |
MRConfig | Place holder for cluster level configuration keys. |
MRJobConfig | |
RawComparator<T> |
A Comparator that operates directly on byte representations of
objects. |
ReduceContext<KEYIN,VALUEIN,KEYOUT,VALUEOUT> | The context passed to the Reducer . |
ReduceContext.ValueIterator<VALUEIN> | ReduceContext.ValueIterator to iterate over values for a given group of records. |
TaskAttemptContext | The context for task attempts. |
TaskInputOutputContext<KEYIN,VALUEIN,KEYOUT,VALUEOUT> | A context object that allows input and output from the task. |
Class Summary | |
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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. |
Job | The job submitter's view of the Job. |
JobConf | A map/reduce job configuration. |
JobContextImpl | 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. |
MapContextImpl<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. |
Partitioner<KEY,VALUE> | Partitions the key space. |
Path | Names a file or directory in a FileSystem . |
ReduceContextImpl<KEYIN,VALUEIN,KEYOUT,VALUEOUT> | NOTE: the format of intermediate result depends on MapContext#write(K,V)
method that refer to RecordWriter |
Reducer<KEYIN,VALUEIN,KEYOUT,VALUEOUT> | Reduces a set of intermediate values which share a key to a smaller set of values. |
StatusReporter | |
TaskAttemptContextImpl | 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. |
TaskInputOutputContextImpl<KEYIN,VALUEIN,KEYOUT,VALUEOUT> | A context object that allows input and output from the task. |
WrappedMapper<KEYIN,VALUEIN,KEYOUT,VALUEOUT> | A Mapper which wraps a given one to allow custom
WrappedMapper.Context implementations. |
WrappedReducer<KEYIN,VALUEIN,KEYOUT,VALUEOUT> | A Reducer which wraps a given one to allow for custom
WrappedReducer.Context implementations. |
Enum Summary | |
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Job.JobState | |
Job.TaskStatusFilter | |
JobStatus.State | Current state of the job |
TaskType | Enum for map, reduce, job-setup, job-cleanup, task-cleanup task types. |
Collection of class to implement a map reduce framework. Most of the classes contained in this package come from Hadoop sources (version 0.21), many of which have been modified.
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