| /** |
| * 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.streaming; |
| |
| import java.io.EOFException; |
| import java.io.IOException; |
| |
| import org.apache.hadoop.fs.FSDataInputStream; |
| import org.apache.hadoop.fs.FileSystem; |
| import org.apache.hadoop.mapred.FileInputFormat; |
| import org.apache.hadoop.mapred.FileSplit; |
| import org.apache.hadoop.mapred.InputFormat; |
| import org.apache.hadoop.mapred.InputSplit; |
| import org.apache.hadoop.mapred.JobConf; |
| import org.apache.hadoop.mapred.RecordReader; |
| import org.apache.hadoop.mapred.Reporter; |
| import org.apache.hadoop.mapred.SequenceFileInputFormat; |
| import org.apache.hadoop.mapred.TextInputFormat; |
| |
| /** |
| * An {@link InputFormat} that tries to deduce the types of the input files |
| * automatically. It can currently handle text and sequence files. |
| */ |
| public class AutoInputFormat extends FileInputFormat { |
| |
| private TextInputFormat textInputFormat = new TextInputFormat(); |
| |
| private SequenceFileInputFormat seqFileInputFormat = |
| new SequenceFileInputFormat(); |
| |
| public void configure(JobConf job) { |
| textInputFormat.configure(job); |
| // SequenceFileInputFormat has no configure() method |
| } |
| |
| public RecordReader getRecordReader(InputSplit split, JobConf job, |
| Reporter reporter) throws IOException { |
| FileSplit fileSplit = (FileSplit) split; |
| FileSystem fs = FileSystem.get(fileSplit.getPath().toUri(), job); |
| FSDataInputStream is = fs.open(fileSplit.getPath()); |
| byte[] header = new byte[3]; |
| RecordReader reader = null; |
| try { |
| is.readFully(header); |
| } catch (EOFException eof) { |
| reader = textInputFormat.getRecordReader(split, job, reporter); |
| } finally { |
| is.close(); |
| } |
| if (header[0] == 'S' && header[1] == 'E' && header[2] == 'Q') { |
| reader = seqFileInputFormat.getRecordReader(split, job, reporter); |
| } else { |
| reader = textInputFormat.getRecordReader(split, job, reporter); |
| } |
| return reader; |
| } |
| |
| } |