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https://issues.apache.org/jira/browse/KAFKA-20796?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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dino2895 reassigned KAFKA-20796:
--------------------------------
Assignee: dino2895
> num-open-iterators metric under-counts iterators from
> MeteredTimestampedKeyValueStore
> -------------------------------------------------------------------------------------
>
> Key: KAFKA-20796
> URL: https://issues.apache.org/jira/browse/KAFKA-20796
> Project: Kafka
> Issue Type: Improvement
> Components: streams
> Reporter: Jess Jin
> Assignee: dino2895
> Priority: Major
>
> MeteredTimestampedKeyValueStoreIterator(streams/src/main/java/org/apache/kafka/streams/state/internals/MeteredTimestampedKeyValueStore.java:301)
> registers itself in {{openIterators}} but never calls
> {{{}numOpenIterators.increment () / decrement(){}}}.
> As a result, iterators opened against a plain (non-headers) timestamped
> key-value store are invisible to the '{{{}num-open-iterators{}}}' metric
> while still visible to '{{{}oldest-iterator-open-since-ms{}}}' - the two
> gauges disagree about how many iterators are open.
> Fix: call {{numOpenIterators.increment()}} in the constructor and
> {{numOpenIterators.decrement()}} in {{close()}}.
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