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From Rita Liu <crystaldol...@gmail.com>
Subject Re: Log4j Logger in MapReduce applications
Date Tue, 07 Sep 2010 17:05:44 GMT
Hi :) I did check stdout under userlogs, but it's empty. If I want to see
the log messages I add to mapper and reducer, should I check them only in
the runtime?

Thanks a lot!

On Sun, Sep 5, 2010 at 10:59 PM, Rita Liu <crystaldoll06@gmail.com> wrote:

> Thanks so much for the kind reply! :) I looked at the web ui of jobtracker
> (50030) but still couldn't find my logger messages. Could you please explain
> a little more? Thanks a lot!
> -Rita :)
>
>
> On Sun, Sep 5, 2010 at 10:47 PM, Hemanth Yamijala <yhemanth@gmail.com>wrote:
>
>> Hi,
>>
>> On Mon, Sep 6, 2010 at 9:49 AM, Rita Liu <crystaldoll06@gmail.com> wrote:
>> > Hi! :)
>> >
>> > I add some Log4j loggers into the mapper, the reducer, and the main
>> method
>> > of WordCount.java. However, after I run this application on the cluster,
>> I
>> > couldn't find any of my log messages from WordCount in any of the hadoop
>> log
>> > files (JobTracker, TaskTracker, Namenode, Secondary Namenode, Datanode).
>> How
>> > may I see my logging messages from WordCount, or, any of the MapReduce
>> > applications?
>> >
>>
>> logger messages added to the mapper and reducers are added to user
>> logs that are generated on the cluster where the tasks run. You can
>> view them from the web ui of the jobtracker, if you navigate to the
>> job, and then its tasks.
>>
>> Thanks
>> Hemanth
>>
>> > If possible, please help me out? Thank you very much!!
>> >
>> > Best,
>> > Rita :)
>> >
>>
>
>

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