nicktelford commented on code in PR #17713:
URL: https://github.com/apache/kafka/pull/17713#discussion_r1836444020
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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:
> Maybe you can just write your own version of ConcurrentSkipListSet for
these iterators, that wraps the ConcurrentSkipListMap while the providing the
needed APIs, and hides all the dummy value stuff so it doesn't get too messy in
the code itself?
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