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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:
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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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