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JavaAPI基础操作单元测试编写并通过

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F嘉阳
2018-04-17 12:17:59 +08:00
parent 8d206f2f59
commit 2fa36190e6
3 changed files with 279 additions and 132 deletions
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@@ -612,13 +561,92 @@
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13
src/main/java/com/fjy/hadoop/App.java
View File

@@ -1,13 +0,0 @@
package com.fjy.hadoop;
/**
* Hello world!
*
*/
public class App
{
public static void main( String[] args )
{
System.out.println( "Hello World!" );
}
}

123
src/main/java/com/fjy/hadoop/mapreduce/WordCountApp.java Normal file
View File

@@ -0,0 +1,123 @@
package com.fjy.hadoop.mapreduce;
import org.apache.hadoop.conf.Configuration;
import org.apache.hadoop.fs.Path;
import org.apache.hadoop.io.LongWritable;
import org.apache.hadoop.io.Text;
import org.apache.hadoop.mapreduce.Job;
import org.apache.hadoop.mapreduce.Mapper;
import org.apache.hadoop.mapreduce.Reducer;
import org.apache.hadoop.mapreduce.lib.input.FileInputFormat;
import org.apache.hadoop.mapreduce.lib.output.FileOutputFormat;
import java.io.IOException;
/**
* 使用MapReduce开发WordCount应用
*/
public class WordCountApp {
/**
* Map：读取输入文件
* Text:类似字符串
*/
public static class MyMapper extends Mapper<LongWritable, Text, Text, LongWritable> {
LongWritable one = new LongWritable(1);
/**
* @param key 偏移量
* @param value 每行的字符串
* @param context 上下文
* @throws IOException
* @throws InterruptedException
*/
@Override
protected void map(LongWritable key, Text value, Context context) throws IOException, InterruptedException {
/*super.map(key, value, context);*/
//接收到每一行数据
String line = value.toString();
//按照指定分隔符进行拆分
/*line.split("\t");//以Tab分隔*/
String[] words = line.split(" ");//以空格分隔
for (String word : words) {
//通过上下文把map的处理结果输出
context.write(new Text(word), one);
}
}
}
/**
* Reduce 归并操作
* LongWritable：文本出现的次数/求和后的次数
*/
public static class MyReducer extends Reducer<Text, LongWritable, Text, LongWritable> {
/**
* @param key
* @param values 相同偏移量的集合
* @param context
* @throws IOException
* @throws InterruptedException
*/
@Override
protected void reduce(Text key, Iterable<LongWritable> values, Context context) throws IOException, InterruptedException {
//super.reduce(key, values, context);
long sum = 0;
for (LongWritable value : values) {
//求key出现的次数和总和
sum += value.get();
}
//统计结果的输出
context.write(key, new LongWritable(sum));
}
}
/**
* 定义Driver,封装MapReduce作业的所有信息
*/
public static void main(String[] args) throws Exception {
//创建Configuration
Configuration configuration = new Configuration();
//创建作业
Job job = Job.getInstance(configuration, "wordcount");
//设置作业的主类
job.setJarByClass(WordCountApp.class);
//作业处理的输入路径
FileInputFormat.setInputPaths(job, new Path(args[0]));
//设置map相关参数
job.setMapperClass(MyMapper.class);
//设置map输出的key的类型
job.setMapOutputKeyClass(Text.class);
//设置map输出的value的类型
job.setMapOutputValueClass(LongWritable.class);
//设置Reduce相关参数
job.setReducerClass(MyReducer.class);
job.setOutputKeyClass(Text.class);
job.setOutputValueClass(LongWritable.class);
//设置作业处理输出结果的输出路径
FileOutputFormat.setOutputPath(job, new Path(args[1]));
//作业提交
job.waitForCompletion(true);
//作业完成后退出
System.exit(job.waitForCompletion(true) ? 0 : 1);
}
}