RecordWriter.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.mapreduce;
- import java.io.IOException;
- 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
- */
- 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;
- }