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https://issues.apache.org/jira/browse/SOLR-11453?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16469732#comment-16469732
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Shawn Heisey commented on SOLR-11453:
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A separate issue for sysprop usage would be a good idea.
Also a separate issue: Eventually, as part of the overall drive to reduce log
verbosity, I think we should have an option to send things from
o.a.s.SolrCore.RequestLog to a separate logfile. Not sure that we want that
enabled by default, but perhaps we can poll the user list for opinions about
whether it should be enabled by default in 8.0. There might be a significant
chunk of the userbase that wants it. The only drawback in my mind to a
separate request log is that it's more difficult to put the requests in context
with everything in solr.log.
For the log4j2.xml config, are you thinking of disabling additivity so that the
slow requests are ONLY logged to the separate file? I think that's a good idea.
> 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,
> SOLR-11453.patch, slowlog-informational.patch, slowlog-informational.patch,
> slowlog-informational.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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