wrunderwood commented on code in PR #96: URL: https://github.com/apache/solr/pull/96#discussion_r1330486585
########## solr/solr-ref-guide/modules/deployment-guide/pages/circuit-breakers.adoc: ########## @@ -48,19 +63,25 @@ To enable and configure the JVM heap usage based circuit breaker, add the follow The `threshold` is defined as a percentage of the max heap allocated to the JVM. -It does not logically make sense to have a threshold below 50% and above 95% of the max heap allocated to the JVM. +For the circuit breaker configuration, a value of "0" maps to 0% usage and a value of "100" maps to 100% usage. + +It does not logically make sense to have a threshold below 50% or above 95% of the max heap allocated to the JVM. Hence, the range of valid values for this parameter is [50, 95], both inclusive. Consider the following example: JVM has been allocated a maximum heap of 5GB (-Xmx) and `threshold` is set to `75`. In this scenario, the heap usage at which the circuit breaker will trip is 3.75GB. -=== CPU Utilization +=== System CPU Usage Circuit Breaker +This circuit breaker tracks system CPU usage and triggers if the recent CPU usage exceeds a configurable threshold. + +This is tracked with the JMX metric `OperatingSystemMXBean.getSystemCpuLoad()`. That measures the +recent CPU usage for the whole system. A value of 0.0 means that all CPUs were idle, while a value +of 1.0 means that all CPUs were actively running 100% of the time. Review Comment: Good catch, removed. -- This is an automated message from the Apache Git Service. To respond to the message, please log on to GitHub and use the URL above to go to the specific comment. To unsubscribe, e-mail: issues-unsubscr...@solr.apache.org For queries about this service, please contact Infrastructure at: us...@infra.apache.org --------------------------------------------------------------------- To unsubscribe, e-mail: issues-unsubscr...@solr.apache.org For additional commands, e-mail: issues-h...@solr.apache.org
