| /** |
| * 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.*; |
| import java.util.*; |
| import junit.framework.TestCase; |
| |
| import org.apache.hadoop.fs.*; |
| import org.apache.hadoop.io.*; |
| import org.apache.hadoop.mapred.*; |
| |
| public class TestLineInputFormat extends TestCase { |
| private static int MAX_LENGTH = 200; |
| |
| private static JobConf defaultConf = new JobConf(); |
| private static FileSystem localFs = null; |
| |
| static { |
| try { |
| localFs = FileSystem.getLocal(defaultConf); |
| } catch (IOException e) { |
| throw new RuntimeException("init failure", e); |
| } |
| } |
| |
| private static Path workDir = |
| new Path(new Path(System.getProperty("test.build.data", "."), "data"), |
| "TestLineInputFormat"); |
| |
| public void testFormat() throws Exception { |
| JobConf job = new JobConf(); |
| Path file = new Path(workDir, "test.txt"); |
| |
| int seed = new Random().nextInt(); |
| Random random = new Random(seed); |
| |
| localFs.delete(workDir, true); |
| FileInputFormat.setInputPaths(job, workDir); |
| int numLinesPerMap = 5; |
| job.setInt("mapreduce.input.lineinputformat.linespermap", numLinesPerMap); |
| |
| // for a variety of lengths |
| for (int length = 0; length < MAX_LENGTH; |
| length += random.nextInt(MAX_LENGTH/10) + 1) { |
| // create a file with length entries |
| Writer writer = new OutputStreamWriter(localFs.create(file)); |
| try { |
| for (int i = 0; i < length; i++) { |
| writer.write(Integer.toString(i)); |
| writer.write("\n"); |
| } |
| } finally { |
| writer.close(); |
| } |
| checkFormat(job, numLinesPerMap); |
| } |
| } |
| |
| // A reporter that does nothing |
| private static final Reporter voidReporter = Reporter.NULL; |
| |
| void checkFormat(JobConf job, int expectedN) throws IOException{ |
| NLineInputFormat format = new NLineInputFormat(); |
| format.configure(job); |
| int ignoredNumSplits = 1; |
| InputSplit[] splits = format.getSplits(job, ignoredNumSplits); |
| |
| // check all splits except last one |
| int count = 0; |
| for (int j = 0; j < splits.length -1; j++) { |
| assertEquals("There are no split locations", 0, |
| splits[j].getLocations().length); |
| RecordReader<LongWritable, Text> reader = |
| format.getRecordReader(splits[j], job, voidReporter); |
| Class readerClass = reader.getClass(); |
| assertEquals("reader class is LineRecordReader.", |
| LineRecordReader.class, readerClass); |
| LongWritable key = reader.createKey(); |
| Class keyClass = key.getClass(); |
| assertEquals("Key class is LongWritable.", LongWritable.class, keyClass); |
| Text value = reader.createValue(); |
| Class valueClass = value.getClass(); |
| assertEquals("Value class is Text.", Text.class, valueClass); |
| |
| try { |
| count = 0; |
| while (reader.next(key, value)) { |
| count++; |
| } |
| } finally { |
| reader.close(); |
| } |
| assertEquals("number of lines in split is " + expectedN , |
| expectedN, count); |
| } |
| } |
| |
| public static void main(String[] args) throws Exception { |
| new TestLineInputFormat().testFormat(); |
| } |
| } |