org.apache.hadoop.mapred

接口 RawKeyValueIterator

public interface RawKeyValueIterator

RawKeyValueIterator is an iterator used to iterate over the raw keys and values during sort/merge of intermediate data.

方法概要

方法

限定符和类型	方法和说明
void	close() Closes the iterator so that the underlying streams can be closed.
DataInputBuffer	getKey() Gets the current raw key.
Progress	getProgress() Gets the Progress object; this has a float (0.0 - 1.0) indicating the bytes processed by the iterator so far
DataInputBuffer	getValue() Gets the current raw value.
boolean	next() Sets up the current key and value (for getKey and getValue).

方法详细资料

getKey

DataInputBuffer getKey()
                       throws IOException

Gets the current raw key.

返回:

Gets the current raw key as a DataInputBuffer

抛出:

IOException

getValue

DataInputBuffer getValue()
                         throws IOException

Gets the current raw value.

返回:

Gets the current raw value as a DataInputBuffer

抛出:

IOException

next

boolean next()
             throws IOException

Sets up the current key and value (for getKey and getValue).

返回:

true if there exists a key/value, false otherwise.

抛出:

IOException

close

void close()
           throws IOException

Closes the iterator so that the underlying streams can be closed.

抛出:

IOException

getProgress

Progress getProgress()

Gets the Progress object; this has a float (0.0 - 1.0) indicating the bytes processed by the iterator so far