我是 Hadoop 新手。我想使用 MRUnit 测试单独测试我的映射器部分。我已经尝试了很多。但我不知道如何解决以下错误
-“MapDriver 类型中的方法 setMapper(Mapper) 不适用于参数 (Recommand.IdIndexMapper)”。我正在使用 Hadoop-1.2.1、Eclipse Juno、mrunit-1.0.0-hadoop1.jar、junit-4.11、mockito-all-1.9.5.jar。下面是我的代码，
我的映射器类：
类名：推荐，
public static class IdIndexMapper extends MapReduceBase implements Mapper<LongWritable, Text, Text, Text>{
public void map(LongWritable key, Text val, OutputCollector<Text, Text> output,Reporter reporter)throws IOException{
String[] ids;
String ln=val.toString();
ids=ln.split("\t");
output.collect(new Text(ids[0]),new Text(ids[1]));
// System.out.println(ids[0]+" "+ids[1]);
}
我的测试代码：
package org.apache.hadoop.examples;
import java.io.IOException;
import java.util.ArrayList;
import java.util.List;
import org.apache.hadoop.classification.InterfaceAudience.Private;
import org.apache.hadoop.classification.InterfaceAudience.Public;
import org.apache.hadoop.examples.WordCount.IntSumReducer;
//import org.apache.hadoop.examples.WordCount.TokenizerMapper;
import org.apache.hadoop.io.IntWritable;
import org.apache.hadoop.io.LongWritable;
import org.apache.hadoop.io.Text;
import org.apache.hadoop.mapred.JobConf;
import org.apache.hadoop.mapreduce.Mapper;
import org.apache.hadoop.mrunit.mapreduce.MapDriver;
import org.junit.Before;
import org.junit.Test;
import org.myorg.Recommand.IdIndexMapper;
public class RecomTest {
MapDriver<LongWritable, Text, Text, Text> mapDriver;
@Before
public void setUp() throws Exception {
IdIndexMapper mapper=new IdIndexMapper();
mapper.configure(new JobConf());
mapDriver=new MapDriver<LongWritable, Text, Text,Text>();
mapDriver.setMapper(mapper);
}
@Test
public void testMapper() throws IOException {
final LongWritable inputKey = new LongWritable(0);
final Text inputValue = new Text("M1023 M1024,M1022,M1025");
final Text outputKey = new Text("M1023");
final Text outputValue = new Text("M1024,M1022,M1025");
mapDriver.withInput(inputKey, inputValue);
mapDriver.withOutput(outputKey, outputValue);
mapDriver.runTest();
}
}
我得到的错误是：
MapDriver 类型中的方法 setMapper(Mapper) 不适用于参数 (Recommand.IdIndexMapper)
谁能帮我解决这个问题？