atris commented on a change in pull request #193:
URL: https://github.com/apache/solr/pull/193#discussion_r673838104
##########
File path: solr/solr-ref-guide/src/circuit-breakers.adoc
##########
@@ -27,23 +27,16 @@ If circuit breakers are enabled, requests may be rejected
under the condition of
It is up to the client to handle this error and potentially build a retrial
logic as this should ideally be a transient situation.
== Circuit Breaker Configurations
-All circuit breaker configurations are listed in the `<circuitBreaker>` tags
in `solrconfig.xml` as shown below:
+All circuit breaker configurations are listed as independent
`<circuitBreaker>` entries in `solrconfig.xml` as shown below:
[source,xml]
----
-<circuitBreaker class="solr.CircuitBreakerManager" enabled="true">
- <!-- All specific configs in this section -->
+<circuitBreaker class="org.apache.solr.util.circuitbreaker.CPUCircuitBreaker"
enable="true">
+ <int name="threshold">75</int>
</circuitBreaker>
----
-The `enabled` attribute controls the global activation/deactivation of circuit
breakers.
-If this flag is disabled, all circuit breakers will be disabled globally.
-Per circuit breaker configurations are specified in their respective sections
later.
-
-This attribute acts as the highest authority and global controller of circuit
breakers.
-For using specific circuit breakers, each one needs to be individually enabled
in addition to this flag being enabled.
-
-`CircuitBreakerManager` is the default manager for all circuit breakers that
should be defined in the tag unless the user wishes to use a custom
implementation.
+Each circuit breaker can be independently enabled/disabled using the
corresponding flag.
Review comment:
I would disagree on the proposed XML format -- seems too clumsy to me.
We could remove the enable flag altogether, although it exists for quick
experimentation (toggle on/off) when using circuit breakers.
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