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https://issues.apache.org/jira/browse/KAFKA-13122?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17386412#comment-17386412
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Matthias J. Sax commented on KAFKA-13122:
-----------------------------------------
Great catch!
> resource leak due to not close KeyValueIterator implemented instances
> ---------------------------------------------------------------------
>
> Key: KAFKA-13122
> URL: https://issues.apache.org/jira/browse/KAFKA-13122
> Project: Kafka
> Issue Type: Bug
> Components: streams
> Reporter: Luke Chen
> Assignee: Luke Chen
> Priority: Major
>
> Found there are "many" KeyValueIterator implemented instances don't
> explicitly get closed, which will cause resource leak.
> From the java doc in KeyValueIterator:
> {color:#808080}* Users must call its {{color}{color:#808080}@code
> {color}{color:#808080}close} method explicitly upon completeness to release
> resources{color}
>
> This issue mostly happen in tests because we usually query state store to get
> result iterator, and then do verification, but forgot close it. This issue
> also *appear in the example code in our developer guide docs*.
>
> I'll use try-with-resource to fix them. To avoid huge PR created, I split
> this bug into 3 sub-tasks.
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