Interface | Description |
---|---|
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 . |
InputSplitWithLocationInfo | |
JobConfigurable |
That what may be configured.
|
JobContext | |
Mapper<K1,V1,K2,V2> |
Maps input key/value pairs to a set of intermediate key/value pairs.
|
MapRunnable<K1,V1,K2,V2> |
Expert: Generic interface for
Mapper s. |
OutputCollector<K,V> | |
OutputFormat<K,V> |
OutputFormat describes the output-specification for a
Map-Reduce job. |
Partitioner<K2,V2> |
Partitions the key space.
|
RecordReader<K,V> |
RecordReader reads <key, value> pairs from an
InputSplit . |
RecordWriter<K,V> |
RecordWriter writes the output <key, value> pairs
to an output file. |
Reducer<K2,V2,K3,V3> |
Reduces a set of intermediate values which share a key to a smaller set of
values.
|
Reporter |
A facility for Map-Reduce applications to report progress and update
counters, status information etc.
|
RunningJob |
RunningJob is the user-interface to query for details on a
running Map-Reduce job. |
TaskAttemptContext |
Class | Description |
---|---|
ClusterStatus |
Status information on the current state of the Map-Reduce cluster.
|
Counters |
A set of named counters.
|
Counters.Counter |
A counter record, comprising its name and value.
|
Counters.Group |
Group of counters, comprising of counters from a particular
counter Enum class. |
FileInputFormat<K,V> |
A base class for file-based
InputFormat . |
FileOutputCommitter |
An
OutputCommitter that commits files specified
in job output directory i.e. |
FileOutputFormat<K,V> |
A base class for
OutputFormat . |
FileSplit |
A section of an input file.
|
FixedLengthInputFormat |
FixedLengthInputFormat is an input format used to read input files
which contain fixed length records.
|
ID |
A general identifier, which internally stores the id
as an integer.
|
JobClient |
JobClient is the primary interface for the user-job to interact
with the cluster. |
JobConf |
A map/reduce job configuration.
|
JobID |
JobID represents the immutable and unique identifier for
the job.
|
JobQueueInfo |
Class that contains the information regarding the Job Queues which are
maintained by the Hadoop Map/Reduce framework.
|
JobStatus |
Describes the current status of a job.
|
KeyValueLineRecordReader |
This class treats a line in the input as a key/value pair separated by a
separator character.
|
KeyValueTextInputFormat |
An
InputFormat for plain text files. |
MapFileOutputFormat |
An
OutputFormat that writes MapFile s. |
MapReduceBase | |
MapRunner<K1,V1,K2,V2> |
Default
MapRunnable implementation. |
MultiFileInputFormat<K,V> |
An abstract
InputFormat that returns MultiFileSplit 's
in MultiFileInputFormat.getSplits(JobConf, int) method. |
MultiFileSplit |
A sub-collection of input files.
|
OutputCommitter |
OutputCommitter describes the commit of task output for a
Map-Reduce job. |
OutputLogFilter |
This class filters log files from directory given
It doesnt accept paths having _logs.
|
SequenceFileAsBinaryInputFormat |
InputFormat reading keys, values from SequenceFiles in binary (raw)
format.
|
SequenceFileAsBinaryOutputFormat |
An
OutputFormat that writes keys, values to
SequenceFile s in binary(raw) format |
SequenceFileAsTextInputFormat |
This class is similar to SequenceFileInputFormat,
except it generates SequenceFileAsTextRecordReader
which converts the input keys and values to their
String forms by calling toString() method.
|
SequenceFileAsTextRecordReader |
This class converts the input keys and values to their String forms by calling toString()
method.
|
SequenceFileInputFilter<K,V> |
A class that allows a map/red job to work on a sample of sequence files.
|
SequenceFileInputFormat<K,V> |
An
InputFormat for SequenceFile s. |
SequenceFileOutputFormat<K,V> |
An
OutputFormat that writes SequenceFile s. |
SequenceFileRecordReader<K,V> |
An
RecordReader for SequenceFile s. |
SkipBadRecords |
Utility class for skip bad records functionality.
|
SplitLocationInfo | |
TaskAttemptID |
TaskAttemptID represents the immutable and unique identifier for
a task attempt.
|
TaskCompletionEvent |
This is used to track task completion events on
job tracker.
|
TaskID |
TaskID represents the immutable and unique identifier for
a Map or Reduce Task.
|
TaskReport |
A report on the state of a task.
|
TextInputFormat |
An
InputFormat for plain text files. |
TextOutputFormat<K,V> |
An
OutputFormat that writes plain text files. |
Utils |
A utility class.
|
Enum | Description |
---|---|
JobPriority |
Used to describe the priority of the running job.
|
TaskCompletionEvent.Status |
Exception | Description |
---|---|
FileAlreadyExistsException |
Used when target file already exists for any operation and
is not configured to be overwritten.
|
InvalidFileTypeException |
Used when file type differs from the desired file type.
|
InvalidInputException |
This class wraps a list of problems with the input, so that the user
can get a list of problems together instead of finding and fixing them one
by one.
|
InvalidJobConfException |
This exception is thrown when jobconf misses some mendatory attributes
or value of some attributes is invalid.
|
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