janhoy commented on code in PR #1905:
URL: https://github.com/apache/solr/pull/1905#discussion_r1322722582
##########
solr/core/src/java/org/apache/solr/util/circuitbreaker/MemoryCircuitBreaker.java:
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@@ -43,8 +46,34 @@ public class MemoryCircuitBreaker extends CircuitBreaker {
private static final ThreadLocal<Long> seenMemory =
ThreadLocal.withInitial(() -> 0L);
private static final ThreadLocal<Long> allowedMemory =
ThreadLocal.withInitial(() -> 0L);
+ /** Creates an instance which averages over 6 samples during last 30
seconds. */
public MemoryCircuitBreaker() {
+ this(6, 5);
+ }
+
+ /**
+ * Constructor that allows override of sample interval for which the memory
usage is fetched. This
+ * is provided for testing, not intended for general use.
+ *
+ * @param numSamples number of samples to calculate average for
+ * @param sampleInterval interval between each sample
+ */
+ protected MemoryCircuitBreaker(int numSamples, int sampleInterval) {
super();
+ if (averagingMetricProvider == null ||
averagingMetricProvider.getRefcount() == 0) {
+ averagingMetricProvider =
Review Comment:
So I made both constructor and close methods synchronized to safeguard
against this.
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