How to Display LOG on Console

[张茂森 <ma...@alibaba-inc.com>]

Hi all: 

I have encountered one problem about displaying log info on Console. 

This is the detailed sentence, in order to show it more clearly, I will use
the code of wordcount:

public class WordCount {

    private static final Log LOG =
LogFactory.getLog(WordCount.class.getName());  // added by me

  public static class MapClass extends MapReduceBase implements Mapper {

    

    private final static IntWritable one = new IntWritable(1);

    private Text word = new Text();

    

    public void map(WritableComparable key, Writable value, 

        OutputCollector output, 

        Reporter reporter) throws IOException {

      String line = ((Text)value).toString();

      StringTokenizer itr = new StringTokenizer(line);

      while (itr.hasMoreTokens()) {

        word.set(itr.nextToken());

        output.collect(word, one);

        LOG.info("printlog");
// added by me

      }

    }

  }

Then I submit the job of wordcount, but I can’t see any information
“printlog” on my Console. Do you have some suggestions?

 

Thank you very much!

RE: How to Display LOG on Console

[Runping Qi <ru...@yahoo-inc.com>]

Hadoop currently does not log user's logging messages.
All the user's logging messages are ignored. Hadoop-489 is to address this
issue.

Runping

> -----Original Message-----
> From: 张茂森 [mailto:maosen.zhang@alibaba-inc.com]
> Sent: Wednesday, November 01, 2006 2:52 AM
> To: hadoop-user@lucene.apache.org
> Subject: How to Display LOG on Console
> 
> Hi all:
> 
> I have encountered one problem about displaying log info on Console.
> 
> This is the detailed sentence, in order to show it more clearly, I will
> use
> the code of wordcount:
> 
> public class WordCount {
> 
>     private static final Log LOG =
> LogFactory.getLog(WordCount.class.getName());  // added by me
> 
>   public static class MapClass extends MapReduceBase implements Mapper {
> 
> 
> 
>     private final static IntWritable one = new IntWritable(1);
> 
>     private Text word = new Text();
> 
> 
> 
>     public void map(WritableComparable key, Writable value,
> 
>         OutputCollector output,
> 
>         Reporter reporter) throws IOException {
> 
>       String line = ((Text)value).toString();
> 
>       StringTokenizer itr = new StringTokenizer(line);
> 
>       while (itr.hasMoreTokens()) {
> 
>         word.set(itr.nextToken());
> 
>         output.collect(word, one);
> 
>         LOG.info("printlog");
> // added by me
> 
>       }
> 
>     }
> 
>   }
> 
> Then I submit the job of wordcount, but I can’t see any information
> “printlog” on my Console. Do you have some suggestions?
> 
> 
> 
> Thank you very much!

Query on the Hadoop storage

[Jagadeesh <ja...@gmail.com>]

Hi,

I have a cluster of more than 25 servers which primararily serves the
purpose for storage. However I was wondering what will happen if the master
node gets exhausted of disk space.

Thanks
Jugs