@InterfaceAudience.Private @InterfaceStability.Unstable

Package org.apache.hadoop.mapreduce.task.reduce

Interface Summary

Interface	Description
ExceptionReporter	An interface for reporting exceptions to other threads
MergeManager<K,V>	An interface for a reduce side merge that works with the default Shuffle implementation.
ShuffleScheduler<K,V>

Class Summary

Class	Description
InMemoryReader<K,V>	IFile.InMemoryReader to read map-outputs present in-memory.
InMemoryWriter<K,V>
MapHost
MapOutput<K,V>
MapOutput.MapOutputComparator<K,V>
MergeManagerImpl<K,V>
Shuffle<K,V>
ShuffleClientMetrics
ShuffleHeader	Shuffle Header information that is sent by the TaskTracker and deciphered by the Fetcher thread of Reduce task
ShuffleSchedulerImpl<K,V>

Enum Summary

Enum	Description
MapHost.State

Exception Summary

Exception	Description
Shuffle.ShuffleError