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From Mathijs Homminga <mathijs.hommi...@knowlogy.nl>
Subject logging on Hadoop
Date Fri, 20 Apr 2007 19:01:58 GMT
Hi all,

I'm a bit confused by the way logging works on Hadoop.
In short, my question is: where does the log from my Nutch plugins end 
up when running on Hadoop?

I'm running Nutch 0.9 on Hadoop 0.12.2.
When I run my code on a single machine I can see that the log ends up in 
${hadoop.log.dir}/${hadoop.log.file}, as defined in the log4j.properties 
file (Nutch and my plugins use commons-logging).
But when I use Hadoop, I can't find any logfile which contains log 
entries generated by the (map|reduce) tasks. However, I do find logfiles 
which contain log from Hadoop-related classes (like the tasktracker, 
jobtracker etc).

I first thought it had something to do with HADOOP-406 
(http://issues.apache.org/jira/browse/HADOOP-406) which is about the 
fact that environment parameters passed to the parent JVM (like 
'hadoop.log.file') are not passed to the child JVM's. But even when I 
specify my log file explicitly (without the use of environment vars) in 
the log4j.properties, I still see no log entries other than the Hadoop 

Any clues?

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