Class Summary |
Cluster |
Provides a way to access information about the map/reduce cluster. |
ClusterMetrics |
Status information on the current state of the Map-Reduce cluster. |
Counters |
Counters holds per job/task counters, defined either by the
Map-Reduce framework or applications. |
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. |
JobID |
JobID represents the immutable and unique identifier for
the job. |
JobStatus |
Describes the current status of a job. |
Mapper<KEYIN,VALUEIN,KEYOUT,VALUEOUT> |
Maps input key/value pairs to a set of intermediate key/value pairs. |
MarkableIterator<VALUE> |
MarkableIterator is a wrapper iterator class that
implements the MarkableIteratorInterface . |
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. |
QueueAclsInfo |
Class to encapsulate Queue ACLs for a particular
user. |
QueueInfo |
Class that contains the information regarding the Job Queues which are
maintained by the Hadoop Map/Reduce framework. |
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. |
Reducer<KEYIN,VALUEIN,KEYOUT,VALUEOUT> |
Reduces a set of intermediate values which share a key to a smaller set of
values. |
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. |
TaskTrackerInfo |
Information about TaskTracker. |