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https://issues.apache.org/jira/browse/SOLR-11453?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16197405#comment-16197405
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Shawn Heisey commented on SOLR-11453:
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bq. Before going here can't you configure specific classes to log to a separate
file in log4j properties at a specific level rather than make a code change?
Yes, but currently it wouldn't be a clean separation.
The slow query logging is done by SolrCore, at the WARN level. The problem is
that there are other things logged in SolrCore at WARN, so log4j cannot easily
tell them apart, and they're not the kinds of things you want in a slow query
log. The patch provides the special logger so that slow queries can be handled
entirely separately from the other warnings that SolrCore logs.
> 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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