Mmuzaf commented on code in PR #2832:
URL: https://github.com/apache/cassandra/pull/2832#discussion_r1367556805
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src/java/org/apache/cassandra/metrics/RepairMetrics.java:
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@@ -18,17 +18,41 @@
package org.apache.cassandra.metrics;
+import java.util.Collections;
+import java.util.EnumMap;
+import java.util.Map;
+
import com.codahale.metrics.Counter;
+import com.codahale.metrics.Histogram;
+import org.apache.cassandra.net.Verb;
import static org.apache.cassandra.metrics.CassandraMetricsRegistry.Metrics;
public class RepairMetrics
{
public static final String TYPE_NAME = "Repair";
public static final Counter previewFailures =
Metrics.counter(DefaultNameFactory.createMetricName(TYPE_NAME,
"PreviewFailures", null));
+ private static final Histogram retries =
Metrics.histogram(DefaultNameFactory.createMetricName(TYPE_NAME, "Retries",
null), false);
+ private static final Map<Verb, Histogram> retriesByVerb =
Collections.synchronizedMap(new EnumMap<>(Verb.class));
Review Comment:
We have the thread-safety guarantees because `Verb` messages are never
processed in parallel, right? `computeIfAbsent` doesn't look like a safe option
for `synchronizedMap` because it's still not an atomic operation - so if
messages for the `Verb` are not strictly ordered somewhere else we could lose
metric values.
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