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See:
Description
Interface Summary | |
InputFormat | An input data format. |
JobConfigurable | That what may be configured. |
MapOutputFile.ProgressReporter | Permits reporting of file copy progress. |
Mapper | Maps input key/value pairs to a set of intermediate key/value pairs. |
MapRunnable | Expert: Permits greater control of map processing. |
OutputCollector | Passed to Mapper and Reducer implementations to collect
output data. |
OutputFormat | An output data format. |
Partitioner | Partitions the key space. |
RecordReader | Reads key/value pairs from an input file FileSplit . |
RecordWriter | Writes key/value pairs to an output file. |
Reducer | Reduces a set of intermediate values which share a key to a smaller set of values. |
Reporter | Passed to application code to permit alteration of status. |
RunningJob | Includes details on a running MapReduce job. |
Class Summary | |
ClusterStatus | Summarizes the size and current state of the cluster. |
FileSplit | A section of an input file. |
InputFormatBase | A base class for InputFormat . |
JobClient | JobClient interacts with the JobTracker network interface. |
JobConf | A map/reduce job configuration. |
JobTracker | JobTracker is the central location for submitting and tracking MR jobs in a network environment. |
JobTrackerInfoServer.RedirectHandler | |
MapFileOutputFormat | An OutputFormat that writes MapFile s. |
MapReduceBase | Base class for Mapper and Reducer implementations. |
MapRunner | Default MapRunnable implementation. |
OutputFormatBase | A base class for OutputFormat . |
SequenceFileInputFormat | An InputFormat for SequenceFile s. |
SequenceFileOutputFormat | An OutputFormat that writes SequenceFile s. |
SequenceFileRecordReader | An RecordReader for SequenceFile s. |
TaskReport | A report on the state of a task. |
TaskTracker | TaskTracker is a process that starts and tracks MR Tasks in a networked environment. |
TaskTracker.Child | The main() for child processes. |
TextInputFormat | An InputFormat for plain text files. |
TextOutputFormat | An OutputFormat that writes plain text files. |
A system for scalable, fault-tolerant, distributed computation over large data collections.
Applications implement Mapper
and
Reducer
interfaces. These are submitted
as a JobConf
and are applied to data
stored in a FileSystem
.
See Google's original Map/Reduce paper for background information.
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