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https://issues.apache.org/jira/browse/SOLR-16974?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17764747#comment-17764747
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Justin Sweeney commented on SOLR-16974:
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Curious on thoughts for how per-core vs per-node circuit breakers should
interact. Here is one potential option:
I could envision it working where per-node are used as defaults and per-core
are more specific overrides. In that case, we would want to only check the
global circuit breakers if there are no per-core circuit breakers enabled of a
given type.
For example, in an environment with Collection A, Collection B, and Collection
C, if per-node CPU circuit was configured for 80%, but Collection A had a
per-core circuit configured for 90%, we should not trip requests to Collection
A when CPU is at 85%, but we would trip requests to Collections B and C.
I'd imagine typical usage would just be configuring global circuit breakers per
node, but the per-core would be more advance usage in multi-collection
environments. What do you think about that?
> Global Circuit Breakers
> -----------------------
>
> Key: SOLR-16974
> URL: https://issues.apache.org/jira/browse/SOLR-16974
> Project: Solr
> Issue Type: New Feature
> Security Level: Public(Default Security Level. Issues are Public)
> Components: Circuit Breakers
> Reporter: Jan Høydahl
> Assignee: Jan Høydahl
> Priority: Major
> Time Spent: 0.5h
> Remaining Estimate: 0h
>
> Currently Circuit Breakers are configured per core in solrconfig.xml.
> However, cores/collections do not live in isolation, and it could be that a
> cluster administrator would like to enforce circuit breakers for the entire
> cluster.
> I'm not clear as to whether we need both cluster level and a core level
> pluggability. And would core-level breakers add to any cluster-level ones or
> override them for that core?
> A potential design is to add this as a new plugin in solr.xml, and have them
> added in a new static context of CircuitBreakerRegistry. Then the isTripped
> logic would consult both the per-core list and the static/global list of
> breakers.
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