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From GUOJUN Zhu <guojun_...@freddiemac.com>
Subject Re: no log function for map/red in a cluster setup
Date Fri, 16 Mar 2012 20:59:08 GMT
I finally figured out.  It is in the "Definitive Guide" (2nd edition) Ch. 
10 Administration/Monitoring/logging.  Every daemons use the same 
log4j.properties file in the default $HADOOP_HOME/conf directory. However, 
one can change the log level dynamically in the web interface.  In every 
daemon's web interface, (http://{taskTrackUrl}:50060, 
http://{dataNode}:50075, http://{jobTrackerUrl}:50030...) , put 
"/logLevel" in the path, e.g. http://{dataNode}:50075/logLevel,  you can 
see the logLevel of one class and change the loglevel of some classes. 
Very nice feature.  Too hard to find though. 

Zhu, Guojun
Modeling Sr Graduate
571-3824370
guojun_zhu@freddiemac.com
Financial Engineering
Freddie Mac
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