OutputCollector.java
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上传日期:2018-01-08
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- /**
- * 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;
- /**
- * Collects the <code><key, value></code> pairs output by {@link Mapper}s
- * and {@link Reducer}s.
- *
- * <p><code>OutputCollector</code> is the generalization of the facility
- * provided by the Map-Reduce framework to collect data output by either the
- * <code>Mapper</code> or the <code>Reducer</code> i.e. intermediate outputs
- * or the output of the job.</p>
- */
- public interface OutputCollector<K, V> {
-
- /** Adds a key/value pair to the output.
- *
- * @param key the key to collect.
- * @param value to value to collect.
- * @throws IOException
- */
- void collect(K key, V value) throws IOException;
- }