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https://issues.apache.org/jira/browse/KAFKA-15437?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Matthias J. Sax resolved KAFKA-15437.
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Resolution: Duplicate
> Add metrics about open iterators
> --------------------------------
>
> Key: KAFKA-15437
> URL: https://issues.apache.org/jira/browse/KAFKA-15437
> Project: Kafka
> Issue Type: New Feature
> Components: streams
> Reporter: Matthias J. Sax
> Priority: Major
> Labels: need-kip
>
> Kafka Streams allows to create iterators over state stores. Those iterator
> must get closed to free up resources (especially for RocksDB). – We regularly
> get user reports of "resource leaks" that can be pinned down to leaking (ie
> not-closed) iterators.
> To simplify monitoring, it would be helpful to add a metric about open
> iterators to allow users to alert and pin-point the issue directly (and
> before the actually resource leak is observed).
> We might want to have a DEBUG level per-store metric (to allow identifying
> the store in question quickly), but an already rolled up INFO level metric
> for the whole application.
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