zentol commented on a change in pull request #8886: [FLINK-12987][metrics] fix
DescriptiveStatisticsHistogram#getCount() not returning the number of elements
seen
URL: https://github.com/apache/flink/pull/8886#discussion_r309586303
##########
File path:
flink-runtime/src/main/java/org/apache/flink/runtime/metrics/DescriptiveStatisticsHistogram.java
##########
@@ -22,25 +22,30 @@
import org.apache.commons.math3.stat.descriptive.DescriptiveStatistics;
+import java.util.concurrent.atomic.AtomicLong;
+
/**
* The {@link DescriptiveStatisticsHistogram} use a DescriptiveStatistics
{@link DescriptiveStatistics} as a Flink {@link Histogram}.
*/
public class DescriptiveStatisticsHistogram implements
org.apache.flink.metrics.Histogram {
private final DescriptiveStatistics descriptiveStatistics;
+ private final AtomicLong elementsSeen = new AtomicLong();
Review comment:
All metrics are read in a multi-thread context; the reporter thread and
MetricQueryService can run concurrently.
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