cpoerschke commented on code in PR #96:
URL: https://github.com/apache/solr/pull/96#discussion_r1310547379
##########
solr/core/src/java/org/apache/solr/util/circuitbreaker/CPUCircuitBreaker.java:
##########
@@ -17,54 +17,49 @@
package org.apache.solr.util.circuitbreaker;
+import com.codahale.metrics.Gauge;
+import com.codahale.metrics.Metric;
import java.lang.invoke.MethodHandles;
-import java.lang.management.ManagementFactory;
-import java.lang.management.OperatingSystemMXBean;
+import org.apache.solr.core.SolrCore;
+import org.apache.solr.metrics.SolrMetricManager;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
/**
* Tracks current CPU usage and triggers if the specified threshold is
breached.
*
- * <p>This circuit breaker gets the average CPU load over the last minute and
uses that data to take
- * a decision. We depend on OperatingSystemMXBean which does not allow a
configurable interval of
- * collection of data. //TODO: Use Codahale Meter to calculate the value
locally.
- *
- * <p>The configuration to define which mode to use and the trigger threshold
are defined in
- * solrconfig.xml
+ * <p>This circuit breaker gets the recent average CPU usage and uses that
data to take a decision.
+ * We depend on OperatingSystemMXBean which does not allow a configurable
interval of collection of
+ * data.
*/
public class CPUCircuitBreaker extends CircuitBreaker {
private static final Logger log =
LoggerFactory.getLogger(MethodHandles.lookup().lookupClass());
- private static final OperatingSystemMXBean operatingSystemMXBean =
- ManagementFactory.getOperatingSystemMXBean();
+ private static boolean warningLogged = false;
Review Comment:
edge case: could the circuit breaker be used from multiple threads and so
`boolean` here needs to be supportive of potentially concurrent access?
##########
solr/solr-ref-guide/modules/deployment-guide/pages/circuit-breakers.adoc:
##########
@@ -70,7 +83,30 @@ To enable and configure the CPU utilization based circuit
breaker:
</circuitBreaker>
----
-The `threshold` is defined in units of CPU utilization.
+The triggering threshold is defined in percent CPU usage. A value of "0" maps
to 0% usage
+and a value of "100" maps to 100% usage. The example above will trip when the
CPU usage is
+equal to or greater than 75%:.
Review Comment:
```suggestion
equal to or greater than 75%:
```
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