hadoop ResetableIterator 源码
haddop ResetableIterator 代码
文件路径：/hadoop-tools/hadoop-datajoin/src/main/java/org/apache/hadoop/contrib/utils/join/ResetableIterator.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.contrib.utils.join;
import java.io.IOException;
import java.util.Iterator;
/**
* This defines an iterator interface that will help the reducer class
* re-group its input by source tags. Once the values are re-grouped,
* the reducer will receive the cross product of values from different groups.
*/
public interface ResetableIterator extends Iterator {
public void reset();
public void add(Object item);
public void close() throws IOException;
}
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