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From "Doug Cutting (JIRA)" <j...@apache.org>
Subject [jira] Commented: (HADOOP-1185) dynamically change log levels
Date Thu, 01 Nov 2007 18:21:51 GMT

    [ https://issues.apache.org/jira/browse/HADOOP-1185?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel#action_12539430
] 

Doug Cutting commented on HADOOP-1185:
--------------------------------------

> Would like a command line utility to change log levels.

This sounds like a good thing to add to GenericOptionsParser, so that one can set log levels
for any command line tool.  Should we do that as a part of this issue or in a separate issue?

> 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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