| /** |
| * 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.*; |
| import java.lang.reflect.*; |
| |
| import org.apache.hadoop.fs.FileSystem; |
| import org.apache.hadoop.fs.FSDataInputStream; |
| import org.apache.hadoop.io.Text; |
| |
| import org.apache.hadoop.mapred.*; |
| |
| /** An input format that selects a RecordReader based on a JobConf property. |
| * This should be used only for non-standard record reader such as |
| * StreamXmlRecordReader. For all other standard |
| * record readers, the appropriate input format classes should be used. |
| */ |
| public class StreamInputFormat extends KeyValueTextInputFormat { |
| |
| @SuppressWarnings("unchecked") |
| public RecordReader<Text, Text> getRecordReader(final InputSplit genericSplit, |
| JobConf job, Reporter reporter) throws IOException { |
| String c = job.get("stream.recordreader.class"); |
| if (c == null || c.indexOf("LineRecordReader") >= 0) { |
| return super.getRecordReader(genericSplit, job, reporter); |
| } |
| |
| // handling non-standard record reader (likely StreamXmlRecordReader) |
| FileSplit split = (FileSplit) genericSplit; |
| LOG.info("getRecordReader start.....split=" + split); |
| reporter.setStatus(split.toString()); |
| |
| // Open the file and seek to the start of the split |
| FileSystem fs = split.getPath().getFileSystem(job); |
| FSDataInputStream in = fs.open(split.getPath()); |
| |
| // Factory dispatch based on available params.. |
| Class readerClass; |
| |
| { |
| readerClass = StreamUtil.goodClassOrNull(job, c, null); |
| if (readerClass == null) { |
| throw new RuntimeException("Class not found: " + c); |
| } |
| } |
| |
| Constructor ctor; |
| try { |
| ctor = readerClass.getConstructor(new Class[] { FSDataInputStream.class, |
| FileSplit.class, Reporter.class, JobConf.class, FileSystem.class }); |
| } catch (NoSuchMethodException nsm) { |
| throw new RuntimeException(nsm); |
| } |
| |
| RecordReader<Text, Text> reader; |
| try { |
| reader = (RecordReader<Text, Text>) ctor.newInstance(new Object[] { in, split, |
| reporter, job, fs }); |
| } catch (Exception nsm) { |
| throw new RuntimeException(nsm); |
| } |
| return reader; |
| } |
| |
| } |