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https://issues.apache.org/jira/browse/SOLR-6650?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14183429#comment-14183429
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Shawn Heisey commented on SOLR-6650:
------------------------------------

I like this idea.  I can turn off INFO logging, set a threshold, and chances 
are good that whatever I need to look at is something that will be logged, but 
the file will not be clogged with every request.

My look at the patch was very quick, so I have not noticed every detail.  It 
looks like this defaults to enabled with a threshold of 1 second.  If that's 
the case, I don't think that's a good idea.  It should default to disabled.

Hopefully it will log all queries if I set the threshold to zero.  A negative 
number in the setting (or the setting not present) would be a good way to turn 
it off. Will this only log queries, or would it log all slow requests, 
including calls to /update?


> Add optional slow request logging at WARN level
> -----------------------------------------------
>
>                 Key: SOLR-6650
>                 URL: https://issues.apache.org/jira/browse/SOLR-6650
>             Project: Solr
>          Issue Type: Improvement
>            Reporter: Jessica Cheng Mallet
>            Assignee: Timothy Potter
>              Labels: logging
>             Fix For: 5.0
>
>
> At super high request rates, logging all the requests can become a bottleneck 
> and therefore INFO logging is often turned off. However, it is still useful 
> to be able to set a latency threshold above which a request is considered 
> "slow" and log that request at WARN level so we can easily identify slow 
> queries.



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