| /** |
| * 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.lib; |
| |
| import java.io.IOException; |
| |
| import org.apache.hadoop.fs.FileSystem; |
| import org.apache.hadoop.mapred.JobConf; |
| import org.apache.hadoop.mapred.OutputFormat; |
| import org.apache.hadoop.mapred.RecordWriter; |
| import org.apache.hadoop.mapred.Reporter; |
| import org.apache.hadoop.util.Progressable; |
| import org.apache.hadoop.util.ReflectionUtils; |
| |
| /** |
| * A Convenience class that creates output lazily. |
| * @deprecated Use |
| * {@link org.apache.hadoop.mapreduce.lib.output.LazyOutputFormat} instead. |
| */ |
| @Deprecated |
| public class LazyOutputFormat<K, V> extends FilterOutputFormat<K, V> { |
| /** |
| * Set the underlying output format for LazyOutputFormat. |
| * @param job the {@link JobConf} to modify |
| * @param theClass the underlying class |
| */ |
| @SuppressWarnings("unchecked") |
| public static void setOutputFormatClass(JobConf job, |
| Class<? extends OutputFormat> theClass) { |
| job.setOutputFormat(LazyOutputFormat.class); |
| job.setClass("mapreduce.output.lazyoutputformat.outputformat", theClass, OutputFormat.class); |
| } |
| |
| @Override |
| public RecordWriter<K, V> getRecordWriter(FileSystem ignored, JobConf job, |
| String name, Progressable progress) throws IOException { |
| if (baseOut == null) { |
| getBaseOutputFormat(job); |
| } |
| return new LazyRecordWriter<K, V>(job, baseOut, name, progress); |
| } |
| |
| @Override |
| public void checkOutputSpecs(FileSystem ignored, JobConf job) |
| throws IOException { |
| if (baseOut == null) { |
| getBaseOutputFormat(job); |
| } |
| super.checkOutputSpecs(ignored, job); |
| } |
| |
| @SuppressWarnings("unchecked") |
| private void getBaseOutputFormat(JobConf job) throws IOException { |
| baseOut = ReflectionUtils.newInstance( |
| job.getClass("mapreduce.output.lazyoutputformat.outputformat", null, OutputFormat.class), |
| job); |
| if (baseOut == null) { |
| throw new IOException("Ouput format not set for LazyOutputFormat"); |
| } |
| } |
| |
| /** |
| * <code>LazyRecordWriter</code> is a convenience |
| * class that works with LazyOutputFormat. |
| */ |
| |
| private static class LazyRecordWriter<K,V> extends FilterRecordWriter<K,V> { |
| |
| final OutputFormat of; |
| final String name; |
| final Progressable progress; |
| final JobConf job; |
| |
| public LazyRecordWriter(JobConf job, OutputFormat of, String name, |
| Progressable progress) throws IOException { |
| this.of = of; |
| this.job = job; |
| this.name = name; |
| this.progress = progress; |
| } |
| |
| @Override |
| public void close(Reporter reporter) throws IOException { |
| if (rawWriter != null) { |
| rawWriter.close(reporter); |
| } |
| } |
| |
| @Override |
| public void write(K key, V value) throws IOException { |
| if (rawWriter == null) { |
| createRecordWriter(); |
| } |
| super.write(key, value); |
| } |
| |
| @SuppressWarnings("unchecked") |
| private void createRecordWriter() throws IOException { |
| FileSystem fs = FileSystem.get(job); |
| rawWriter = of.getRecordWriter(fs, job, name, progress); |
| } |
| } |
| } |