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https://issues.apache.org/jira/browse/HADOOP-1185?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel#action_12539459
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Doug Cutting commented on HADOOP-1185:
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Sorry, I spoke out of context. A generic command line option makes sense for
setting the log level of client programs, not daemons. So someone should be
able to specify '-loglevel DEBUG' for any Hadoop command and have it affect the
logging done by that command. But that's a separate issue from what's
discussed here, and perhaps there's an easy way to do this already. (Is there?)
For the issue here, changing the log level of daemon processes, i agree that a
separate command is needed. My preference might be something like:
bin/hadoop daemonlog -setlevel host:port NAME LEVEL
We use the term 'daemon' to generically refer to all our daemons. Perhaps the
command could also read logs with something like, 'bin/hadoop daemonlog -tail
NAME'? So the command might provide generic access to the logs of our daemons.
That might not be supported in the first version, but would be the long-term
plan for the command.
> dynamically change log levels
> -----------------------------
>
> Key: HADOOP-1185
> URL: https://issues.apache.org/jira/browse/HADOOP-1185
> Project: Hadoop
> Issue Type: Improvement
> Components: util
> Affects Versions: 0.16.0
> Reporter: dhruba borthakur
> Assignee: Tsz Wo (Nicholas), SZE
> Fix For: 0.16.0
>
> Attachments: 1185_20071031.patch
>
>
> I would like to switch on the debug log level of the namenode (or other
> components) without restarting it. This is needed to analyze a production
> system.
> Can somebody please advice on how to set the loglevel dyncamically on a
> running namenode? I was thinking of enhancing dfsadmin to make an RPC to the
> namenode to set a specified logging level. But the apache common logging APi
> does not export an API to change logging levels.
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