[jira] [Resolved] (KAFKA-15437) Add metrics about open iterators

["Matthias J. Sax (Jira)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/KAFKA-15437?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

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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