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https://issues.apache.org/jira/browse/SOLR-11453?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16464689#comment-16464689
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Ralph Goers commented on SOLR-11453:
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If you want to have a configuration that is only enabled under special
circumstances you can use the RoutingAppender -
http://logging.apache.org/log4j/2.x/manual/appenders.html#RoutingAppender or
the ScriptAppenderSelector -
http://logging.apache.org/log4j/2.x/manual/appenders.html#ScriptAppenderSelector.
If those don't fit the bill make a suggestion for how you would like it to
work.
> Create separate logger for slow requests
> ----------------------------------------
>
> Key: SOLR-11453
> URL: https://issues.apache.org/jira/browse/SOLR-11453
> Project: Solr
> Issue Type: Improvement
> Components: logging
> Affects Versions: 7.0.1
> Reporter: Shawn Heisey
> Assignee: Shawn Heisey
> Priority: Minor
> Attachments: SOLR-11453.patch, SOLR-11453.patch, SOLR-11453.patch
>
>
> There is some desire on the mailing list to create a separate logfile for
> slow queries. Currently it is not possible to do this cleanly, because the
> WARN level used by slow query logging within the SolrCore class is also used
> for other events that SolrCore can log. Those messages would be out of place
> in a slow query log. They should typically stay in main solr logfile.
> I propose creating a custom logger for slow queries, similar to what has been
> set up for request logging. In the SolrCore class, which is
> org.apache.solr.core.SolrCore, there is a special logger at
> org.apache.solr.core.SolrCore.Request. This is not a real class, just a
> logger which makes it possible to handle those log messages differently than
> the rest of Solr's logging. I propose setting up another custom logger
> within SolrCore which could be org.apache.solr.core.SolrCore.SlowRequest.
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