org.apache.hadoop.mapreduce

Interface ReduceContext.ValueIterator<VALUEIN>

All Known Implementing Classes:

ReduceContextImpl.ValueIterator

Enclosing interface:

ReduceContext<KEYIN,VALUEIN,KEYOUT,VALUEOUT>

public static interface ReduceContext.ValueIterator<VALUEIN>

Iterator to iterate over values for a given group of records.

Method Summary

Methods

Modifier and Type	Method and Description
void	clearMark() Clear any previously set mark
void	mark() Mark the current record.
void	reset() Reset the iterator to the last record before a call to the previous mark
void	resetBackupStore() This method is called when the reducer moves from one key to another.

Methods inherited from interface java.util.Iterator

hasNext, next, remove

Method Detail

resetBackupStore

void resetBackupStore()
                      throws IOException

This method is called when the reducer moves from one key to another.

Throws:

IOException

mark

void mark()
          throws IOException

Mark the current record. A subsequent call to reset will rewind the iterator to this record.

Throws:

IOException

reset

void reset()
           throws IOException

Reset the iterator to the last record before a call to the previous mark

Throws:

IOException

clearMark

void clearMark()
               throws IOException

Clear any previously set mark

Throws:

IOException