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<div style="text-align: center; color:#151B8D"><big style="font-weight: bold;"><big><big>
Hadoop 進階課程 
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範例練習
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[wiki:NCHCCloudCourse100928_4_EXM7 上一關 < ] 補充 [wiki:NCHCCloudCourse110721 > 回課程大綱 ]

= 說明 = 
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#!text
此範例使用"執行緒"一次執行兩個不同的"hadoop job"
以及在程式中使用 conf.set 來修改 hadoop 環境設定，如
  conf.set("mapred.job.tracker", "local"); // for single
  conf.set("fs.default.name", "file:///"); // for single
}}}

= !ThreadGo.java =
{{{
#!java
package org.nchc.hadoop;

import java.io.IOException;

import org.apache.hadoop.conf.Configuration;
import org.apache.hadoop.fs.Path;
import org.apache.hadoop.io.IntWritable;
import org.apache.hadoop.io.LongWritable;
import org.apache.hadoop.io.Text;
import org.apache.hadoop.mapreduce.Job;
import org.apache.hadoop.mapreduce.lib.input.FileInputFormat;
import org.apache.hadoop.mapreduce.lib.output.FileOutputFormat;

public class ThreadGo extends Thread {
	Configuration conf ;
	Job job ;
	long StartTime ;
	public ThreadGo() {
		conf = new Configuration();
//		conf.set("mapred.job.tracker", "local"); // for single
//		conf.set("fs.default.name", "file:///"); // for single
		StartTime = System.currentTimeMillis();
	}
	
	public void run() // throws Exception
	{
			try {
				System.err.println(conf.get("fs.default.name"));
				job.waitForCompletion(true);
				System.out.println("[final] "+ job.getJobName() +" run" + (System.currentTimeMillis() - StartTime) / 1E+3 +" secs.");

			} catch (IOException e) {
				System.err.println("[Error] " + job.getJobName() + " = IOException");
				System.err.println(e.getMessage());
			} catch (InterruptedException e) {
				System.err.println("[Error] " + job.getJobName() + " = InterruptedException" );
				System.err.println(e.getMessage());
			} catch (ClassNotFoundException e) {
				System.err.println("[Error] " + job.getJobName() + " ClassNotFoundException");
				System.err.println(e.getMessage());
			}
	}

	public void SetJob1(String input, String output) throws Exception {
		job = new Job(conf, "Th1_HelloWorld");
		job.setJarByClass(HelloHadoopV2.class);
		job.setMapperClass(HelloMapperV2.class);

		job.setCombinerClass(HelloReducerV2.class);
		job.setReducerClass(HelloReducerV2.class);
		job.setOutputKeyClass(LongWritable.class);
		job.setOutputValueClass(Text.class);
		FileInputFormat.setInputPaths(job, input);
		FileOutputFormat.setOutputPath(job, new Path(output));
	}

	public void SetJob2(String input, String output) throws Exception {
		// JobConf conf = new JobConf(DBWordCount.class);
		job = new Job(conf, "Th2_WordCount");
		job.setJarByClass(WordCount.class);
		job.setMapperClass(WordCount.TokenizerMapper.class);
		job.setCombinerClass(WordCount.IntSumReducer.class);
		job.setReducerClass(WordCount.IntSumReducer.class);
		job.setOutputKeyClass(Text.class);
		job.setOutputValueClass(IntWritable.class);
		FileInputFormat.addInputPath(job, new Path(input));
		FileOutputFormat.setOutputPath(job, new Path(output));
	}

	public static void main(String[] args) throws Exception {
		
		long StartTime = System.currentTimeMillis();
		ThreadGo thread1 = new ThreadGo();
		thread1.SetJob1("./input1","./output1");
		
		ThreadGo thread2 = new ThreadGo();
		thread2.SetJob2("./input2","./output2");

		thread1.start();
		thread2.start();
		System.out.println("[main] "+  (System.currentTimeMillis() - StartTime) / 1E+3 +" secs.");

	}
}


}}}