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From "oliverboss (JIRA)" <j...@apache.org>
Subject [jira] Created: (HDFS-1488) hadoop will terminate Web service process when a hadoop mapreduce task is finished.
Date Fri, 05 Nov 2010 13:01:51 GMT
hadoop will terminate Web service process when a hadoop mapreduce task is finished.
-----------------------------------------------------------------------------------

                 Key: HDFS-1488
                 URL: https://issues.apache.org/jira/browse/HDFS-1488
             Project: Hadoop HDFS
          Issue Type: Bug
          Components: name-node
    Affects Versions: 0.20.2
         Environment: OS:windows XP + cygwin + hadoop 0.20.2 + myeclipse8.5
            Reporter: oliverboss
             Fix For: 0.20.2


1. In the myeclipse 8.5 enviroment, I create a new Map/Reduce project named wordcount project!
2. create class including "public void main(string[] args)" named Wordcount
3.copy the hadoop wordcount exampler code from the hadoop folder to "wordcount project ".
4. in the main() method, I add a jetty server and start it .the codes is showed as follows!
5.when I build and run it, i find jetty server will be terminate after hadoop task finishs.
6.I check hadoop jobtracker logs showing as follows.
======================================================
 logs
2010-11-05 16:47:41,968 INFO org.apache.hadoop.ipc.Server: IPC Server listener on 9001: readAndProcess
threw exception java.io.IOException: connection was forcibly closed .Count of bytes read:
0
java.io.IOException: connection was forcibly closed
	at sun.nio.ch.SocketDispatcher.read0(Native Method)
	at sun.nio.ch.SocketDispatcher.read(SocketDispatcher.java:25)
	at sun.nio.ch.IOUtil.readIntoNativeBuffer(IOUtil.java:233)
	at sun.nio.ch.IOUtil.read(IOUtil.java:206)
	at sun.nio.ch.SocketChannelImpl.read(SocketChannelImpl.java:236)
	at org.apache.hadoop.ipc.Server.channelRead(Server.java:1214)
	at org.apache.hadoop.ipc.Server.access$16(Server.java:1210)
	at org.apache.hadoop.ipc.Server$Connection.readAndProcess(Server.java:801)
	at org.apache.hadoop.ipc.Server$Listener.doRead(Server.java:419)
	at org.apache.hadoop.ipc.Server$Listener.run(Server.java:328)
==============================================
codes:
	public static void main(String[] args) throws Exception {

		Handler handler = new AbstractHandler() {

			@Override
			public void handle(String target, HttpServletRequest request,
					HttpServletResponse response, int dispatch)
					throws IOException, ServletException {
				// TODO Auto-generated method stub
				response.setContentType("text/html");
				response.setStatus(HttpServletResponse.SC_OK);
				response.getWriter().println("<h1>------start-------</h1>");
				// ---------------------------------------
				// ---------------------------------------
				response.getWriter().println("<h1>------end1-------</h1>");
				((Request) request).setHandled(true);
				// request.getRequestDispatcher("/WebRoot/result.jsp").forward(request,
				// response);
			}
		};

		// 开启Jetty服务
		Server server = new Server(8086);
		server.setHandler(handler);
		server.start();
		// server.join();
		
		

		SimpleDateFormat tempDate = new SimpleDateFormat("yyyy_MM_dd"
				+ "_hh_mm_ss");
		String datetime = tempDate.format(new java.util.Date());

		String out4 = "out" + datetime;
		args = new String[] { "in", out4 };
		Configuration conf = new Configuration();
		String[] otherArgs = new GenericOptionsParser(conf, args)
				.getRemainingArgs();
		if (otherArgs.length != 2) {
			System.err.println("Usage: wordcount <in> <out>");
			System.exit(2);
		}
		Job job = new Job(conf, "word count");
		job.setJarByClass(WordCount.class);
		job.setMapperClass(TokenizerMapper.class);
		job.setCombinerClass(IntSumReducer.class);
		job.setReducerClass(IntSumReducer.class);
		job.setOutputKeyClass(Text.class);
		job.setOutputValueClass(IntWritable.class);
		FileInputFormat.addInputPath(job, new Path(otherArgs[0]));
		FileOutputFormat.setOutputPath(job, new Path(otherArgs[1]));
		System.exit(job.waitForCompletion(true) ? 0 : 1);
	}

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