nicktelford commented on code in PR #17713:
URL: https://github.com/apache/kafka/pull/17713#discussion_r1833342813
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streams/src/main/java/org/apache/kafka/streams/state/internals/MeteredKeyValueStore.java:
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@@ -154,7 +155,13 @@ private void registerMetrics() {
StateStoreMetrics.addNumOpenIteratorsGauge(taskId.toString(),
metricsScope, name(), streamsMetrics,
(config, now) -> numOpenIterators.sum());
StateStoreMetrics.addOldestOpenIteratorGauge(taskId.toString(),
metricsScope, name(), streamsMetrics,
- (config, now) -> openIterators.isEmpty() ? null :
openIterators.first().startTimestamp()
+ (config, now) -> {
+ try {
+ return openIterators.isEmpty() ? null :
openIterators.first().startTimestamp();
Review Comment:
Unfortunately, that method removes the element from the Set, which we don't
want to do in the Gauge!
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