janhoy commented on code in PR #96:
URL: https://github.com/apache/solr/pull/96#discussion_r1310587960
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solr/core/src/java/org/apache/solr/util/circuitbreaker/CPUCircuitBreaker.java:
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@@ -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:
The consequence of a race condition here would be that there would be more
than one WARN log line before it gets muted, since we don't have code that
resets it to false anywhere. Think we can live with that. Other concerns?
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