I was looking for the same thing, but found that tasks' log level is hardcoded. It is fixed by MAPREDUCE-336 (in 0.21).
From: Shrijeet Paliwal [mailto:[email protected]] Sent: Tuesday, October 12, 2010 11:35 AM To: [email protected] Subject: Change logging level of task attempts Hi Users, How do I change the log4j logging level of task attempts (the information dumped in syslog) to DEBUG? I tried setting log4j.logger.org.apache.hadoop.mapred.TaskTracker to Debug, but that didnt help. I would like to avoid cluster restart. Hoping its possible to over ride the INFO level, which seems to be default, from command line. -Shrijeet
