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https://issues.apache.org/jira/browse/SOLR-16044?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17497872#comment-17497872
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Shawn Heisey commented on SOLR-16044:
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I was involved on SOLR-11453 but it was [~varun] that did all the code commits.
Then [~ctargett] did commits for the ref guide.
> SlowRequest logging disabled if SolrCore logger set to ERROR
> ------------------------------------------------------------
>
> Key: SOLR-16044
> URL: https://issues.apache.org/jira/browse/SOLR-16044
> Project: Solr
> Issue Type: Bug
> Security Level: Public(Default Security Level. Issues are Public)
> Components: logging
> Environment: Solr 8.4
> Reporter: Jan Høydahl
> Priority: Major
>
> If someone sets ROOT logger to ERROR, then {{SolrCore}} class will also be
> set to ERROR, and even if {{SolrCore.SlowRequest}} level is set to INFO, no
> logs will be written to {{{}solr_slow_requests.log{}}}.
> Some debugging revealed that changing log level of {{SolrCore}} to WARN fixes
> it. This suggests that since {{SlowRequest}} is not a real class but just a
> logger name, it is still subject to the log level of {{SolrCore}}.
> I suppose that the same will be true for {{SolrCore.Request}} logging.
> One solution could be to create a real class for SlowRequest logging. Another
> solution could be to explicitly set {{SolrCore}} level in {{log4j2.xml}} so
> that it does not follow the ROOT level.
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