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From Ashish Jain <>
Subject Re: Logger output
Date Fri, 09 Aug 2013 17:48:09 GMT
Hello Marco,

In my experiments, I have found the log output to be in the hadoop log file
of the application. When you run your application, note down the job
number. The hadoop log file is usually in
HADOOP_BASE_PATH/logs/userlogs/job_number. In it you need to look at
syslog, among the various lines interleaved will be the output of Log.

If you run your program on a cluster, you might have to find out on which
node was the program run. One way is, if you use -op in your application,
look at the log to see the cluster node name. Other way is to just check
the HADOOP_BASE_PATH/logs/userlogs/job_number on all the nodes of your
cluster. You will find output from the MasterThread and from one/more
worker threads.

This is the approach I have used, there might be a better way to do this.
Hope this helps.


On Fri, Aug 9, 2013 at 4:43 AM, Marco Aurelio Barbosa Fagnani Lotz <> wrote:

>  Hello there! :)
> I am writing a Giraph application but I could not find the output place
> for the logs.
> Where is the default output path to see the logged info?
> By log I mean the log that is inside a class that one creates:
> private static final Logger LOG =
>       Logger.getLogger(SimpleBFSComputation.class);
> I call the following method to enable that log to debug:
> Log.setLevel(Level.DEBUG);
>  And then write some random content in it:
> if (LOG.isDebugEnabled){
>     LOG.debug("This is a logged line");}
> Just to clarify, if I called the "Log.setLevel(Level.DEBUG);" I am
> enabling the log for debug, and then the method isDebugEnabled will
> return true, correct?
> Best Regards,
> Marco Lotz

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