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https://issues.apache.org/jira/browse/SOLR-6650?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14183450#comment-14183450
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Tomás Fernández Löbbe commented on SOLR-6650:
---------------------------------------------

bq.  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.
+1 Specially now that the idea is to log WARN in addition to INFO. People that 
don't have this setting in the solrconfig (upgrading?) will start logging twice 
for many queries.

> 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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