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https://issues.apache.org/jira/browse/KAFKA-12656?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17379871#comment-17379871
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Angelos Kaltsikis commented on KAFKA-12656:
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Hey [~liangx],
Thanks for opening this.
Can you provide more details on what happened and in which Kafka version?
We may have faced a similar problem on one of our Kafka brokers but 
unfortunately we don't have any information about that as the broker has been 
restarted before gathering any details :(

> JMX exporter is leaking a lot of file descriptors
> -------------------------------------------------
>
>                 Key: KAFKA-12656
>                 URL: https://issues.apache.org/jira/browse/KAFKA-12656
>             Project: Kafka
>          Issue Type: Bug
>          Components: KafkaConnect
>            Reporter: Liang Xia
>            Priority: Major
>
> jmx exporter doesn't close the connections successfuly after reporting the 
> metrics.
> They are stuck in CLOSE_WAIT state.
> java    2351 kcbq *385u     IPv6            3660408       0t0      TCP 
> example.internal:9404->x.x.x.x:39470 (CLOSE_WAIT)



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