michaeljmarshall commented on code in PR #4300:
URL: https://github.com/apache/bookkeeper/pull/4300#discussion_r1576576909
##########
stats/bookkeeper-stats-providers/prometheus-metrics-provider/src/main/java/org/apache/bookkeeper/stats/prometheus/ThreadScopedDataSketchesStatsLogger.java:
##########
@@ -96,15 +96,25 @@ private DataSketchesOpStatsLogger getStatsLogger() {
ThreadRegistry.ThreadPoolThread tpt = ThreadRegistry.get();
if (tpt == null) {
statsLoggers.set(defaultStatsLogger);
- provider.opStats.put(new ScopeContext(scopeContext.getScope(),
originalLabels), defaultStatsLogger);
+ DataSketchesOpStatsLogger previous = provider.opStats
+ .put(new ScopeContext(scopeContext.getScope(),
originalLabels), defaultStatsLogger);
+ // If we overwrite a logger, metrics will not be collected
correctly
+ if (previous != null && previous != defaultStatsLogger) {
+ throw new IllegalStateException("Invalid state. Overwrote
a stats logger.");
+ }
Review Comment:
Also, many metrics were removed in the 4.16 release, implying there isn't a
strict sense of compatibility here.
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