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https://issues.apache.org/jira/browse/SOLR-17277?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17848190#comment-17848190
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Jason Gerlowski commented on SOLR-17277:
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Starting to work on this.  Does anyone have a preference on what we call the 
feature - it's likely to be visible in system properties etc, so I'd like to 
pick a name folks are happy with!

"Dry Run" mode?  "Warn only" mode?  Something else?

> Circuit Breakers should support a "Warn-only" mode
> --------------------------------------------------
>
>                 Key: SOLR-17277
>                 URL: https://issues.apache.org/jira/browse/SOLR-17277
>             Project: Solr
>          Issue Type: Improvement
>      Security Level: Public(Default Security Level. Issues are Public) 
>          Components: Circuit Breakers
>    Affects Versions: main (10.0)
>            Reporter: Jason Gerlowski
>            Priority: Minor
>              Labels: newdev
>
> The threshold values used when configuring Circuit Breakers are incredibly 
> important.  Identifying when load begins to get "dangerous" is tricky: too 
> stringent and users will get 429s unnecessarily, too lax and the circuit 
> breakers won't be effective at preventing crashes.
> Conservative users may wish to evaluate potential thresholds without actually 
> blocking traffic.  Could Circuit Breakers offer some sort of "Dry Run" 
> capability - where a request that would otherwise have been blocked merely 
> logs a message?  This would allow users to get feedback on their thresholds 
> before they actually start sending CB-based 429s to users.



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