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https://issues.apache.org/jira/browse/SOLR-16771?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17719032#comment-17719032
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ASF subversion and git services commented on SOLR-16771:
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Commit 0788fb488b78a31347738bbc481041f115f673f0 in solr's branch
refs/heads/main from Chris M. Hostetter
[ https://gitbox.apache.org/repos/asf?p=solr.git;h=0788fb488b7 ]
SOLR-16771: Fixed behavior and handling of 'unset' logging levels in
/admin/info/logging API and related Admin UI
> "Logging > Level" UI/API does not properly get/update loggers with 'unset'
> Level
> --------------------------------------------------------------------------------
>
> Key: SOLR-16771
> URL: https://issues.apache.org/jira/browse/SOLR-16771
> Project: Solr
> Issue Type: Bug
> Reporter: Chris M. Hostetter
> Assignee: Chris M. Hostetter
> Priority: Major
> Attachments: SOLR-16771.patch
>
>
> If you're using the Solr Admin UI, or the underlying {{/admin/info/logging}}
> request handler, the option to 'unset' a log level (so the specified logger
> will inherit the effective level from it's parent) doesn't actually work.
> This is because the underlying {{Log4j2Watcher}} impl is explicitly calling
> {{LoggerConfig.setLevel(Level.OFF)}} -- meaning it won't log anything
> regardless of what it's parent logger setting is.
> The correct behavior is to use {{LoggerConfig.setLevel(null)}}
> While looking into this, I realized that the impls of
> {{Log4j2Watcher.getAllLoggers()}} and {{Log4j2Watcher.Log4j2Info.isSet()}}
> are also really bizarre and don't make much sense -- making it impossible to
> tell in the UI which classes *actually* have a 'set' value in the underlying
> Log4j2 configuration.
> ( Just because a {{LoggerConfig}} exists for a loggerName, doesn't mean it's
> {{Level}} is "set" -- but the code currently assumes it does. That's the
> distinction between {{LoggerConfig.getLevel()}} and
> {{LoggerConfig.getExplicitLevel()}} -- the later may return null.)
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