hadoop RawKeyValueIterator 源码
haddop RawKeyValueIterator 代码
文件路径：/hadoop-mapreduce-project/hadoop-mapreduce-client/hadoop-mapreduce-client-core/src/main/java/org/apache/hadoop/mapred/RawKeyValueIterator.java
/**
* Licensed to the Apache Software Foundation (ASF) under one
* or more contributor license agreements. See the NOTICE file
* distributed with this work for additional information
* regarding copyright ownership. The ASF licenses this file
* to you under the Apache License, Version 2.0 (the
* "License"); you may not use this file except in compliance
* with the License. You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package org.apache.hadoop.mapred;
import java.io.IOException;
import org.apache.hadoop.classification.InterfaceAudience;
import org.apache.hadoop.classification.InterfaceStability;
import org.apache.hadoop.io.DataInputBuffer;
import org.apache.hadoop.util.Progress;
/**
* <code>RawKeyValueIterator</code> is an iterator used to iterate over
* the raw keys and values during sort/merge of intermediate data.
*/
@InterfaceAudience.Private
@InterfaceStability.Unstable
public interface RawKeyValueIterator {
/**
* Gets the current raw key.
*
* @return Gets the current raw key as a DataInputBuffer
* @throws IOException
*/
DataInputBuffer getKey() throws IOException;
/**
* Gets the current raw value.
*
* @return Gets the current raw value as a DataInputBuffer
* @throws IOException
*/
DataInputBuffer getValue() throws IOException;
/**
* Sets up the current key and value (for getKey and getValue).
*
* @return <code>true</code> if there exists a key/value,
* <code>false</code> otherwise.
* @throws IOException
*/
boolean next() throws IOException;
/**
* Closes the iterator so that the underlying streams can be closed.
*
* @throws IOException
*/
void close() throws IOException;
/** Gets the Progress object; this has a float (0.0 - 1.0)
* indicating the bytes processed by the iterator so far
*/
Progress getProgress();
}
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