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https://issues.apache.org/jira/browse/HADOOP-1185?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel#action_12539456
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Tsz Wo (Nicholas), SZE commented on HADOOP-1185:
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> This sounds like a good thing to add to GenericOptionsParser
Then, how would the command look like? I am thinking something like
hadoop LogLevel -get host:port logName
hadoop LogLevel -set host:port logName level
or using url (i.e. the same way as the servlet)
hadoop LogLevel http://host:port/logLevel?log=name&level=lev
> 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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