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https://issues.apache.org/jira/browse/SOLR-17277?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17848331#comment-17848331
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Jason Gerlowski commented on SOLR-17277:
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Yeah, I think (3) would be cool,
Adding APIs to reconfigure CBs on the fly, etc. is beyond our scope here I
think. For fear of letting the perfect be the enemy of the good, I'll use this
ticket to focus on only (2) - it's a nice discrete chunk to break off, and then
we can go from there on other tickets.
(I think (3) in particular would be pretty cool - but it'd require a real
overhaul in how CB's are configured - especially in the "global" CB case where
the only way to configure things currently is with a finite list of system
props. It'd be easier to tackle if "global" CB's could be configured in
solr.xml, similar to how the collection-level CB's are done. But maybe in the
future at some point...)
> 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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