This obviously doesn't help you with 2.4, but in trunk/3.x this is significantly easier to do:
hdfs --loglevel DEBUG namenode (interactive/non-daemon mode, output to console, usually) hdfs --loglevel DEBUG --daemon start namenode (daemon mode, output to log file, usually) On Mar 25, 2015, at 8:13 AM, xiaohe lan <zombiexco...@gmail.com> wrote: > Hi Charles, > > In my hadoop-env.sh, I set > > export HADOOP_CLIENT_OPTS="-Dhadoop.root.logger=DEBUG,console -Xmx512m > $HADOOP_CLIENT_OPTS" > > However, I could not see the debug log in NN's log file > hadoop-xilan-namenode-xxxx.out. By setting export > HADOOP_ROOT_LOGGER="DEBUG,console" I could see lots of debug log. > > One more question is what will be written to the .log file and what will be > written to the .out file ? > > @Rich, > > I also tried your method but I could not see the debug log as well. I must > be missing something. > > Thanks, > Xiaohe > > On Tue, Mar 24, 2015 at 10:55 PM, Rich Haase <rha...@pandora.com> wrote: > >> If you want to enable debug logging of all hadoop components you can add >> this line to your log4j.properties. >> >> log4j.logger.org.apache.hadoop=DEBUG >> >> However, in a 3 node cluster that is doing next to nothing this produces a >> lot of log output, so I find it preferable to specify an one daemon type at >> a time to enable debug logging on, e.g. >> >> log4j.logger.org.apache.hadoop.NameNode=DEBUG >> >> It’s also worth while to review the hadoop daemonlog command, which can be >> used to change the log level of running daemons. >> >> Cheers, >> >> Rich >> >> On Mar 24, 2015, at 10:38 AM, Charles Lamb <cl...@cloudera.com<mailto: >> cl...@cloudera.com>> wrote: >> >> One way is to do: >> >> HADOOP_CLIENT_OPTS="-Dhadoop.root.logger=DEBUG,console" >> >> IHTH. >> >> Charles >> >> On 3/24/2015 10:25 AM, xiaohe lan wrote: >> ---------- Forwarded message ---------- >> From: xiaohe lan <zombiexco...@gmail.com<mailto:zombiexco...@gmail.com>> >> Date: Tue, Mar 24, 2015 at 9:04 PM >> Subject: How to enable debug log in HDFS >> To: u...@hadoop.apache.org<mailto:u...@hadoop.apache.org> >> >> >> Hi expert, >> >> I am using Hadoop 2.4, I need to see the debug log of HDFS when performing >> some operations. Where can I set it. I did a search in log4j.properties but >> I don't what can I do with it. >> >> Thanks, >> Xiaohe >> >> >> >>
