Java tutorial
/** * 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.mapreduce; import java.io.IOException; import org.apache.hadoop.classification.InterfaceAudience; import org.apache.hadoop.classification.InterfaceStability; import org.apache.hadoop.fs.FileSystem; /** * <code>RecordWriter</code> writes the output <key, value> pairs * to an output file. * <p><code>RecordWriter</code> implementations write the job outputs to the * {@link FileSystem}. * * @see OutputFormat */ @InterfaceAudience.Public @InterfaceStability.Stable public abstract class RecordWriter<K, V> { /** * Writes a key/value pair. * * @param key the key to write. * @param value the value to write. * @throws IOException */ public abstract void write(K key, V value) throws IOException, InterruptedException; /** * Close this <code>RecordWriter</code> to future operations. * * @param context the context of the task * @throws IOException */ public abstract void close(TaskAttemptContext context) throws IOException, InterruptedException; }