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https://issues.apache.org/jira/browse/KAFKA-9239?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Anders Eknert resolved KAFKA-9239.
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Resolution: Fixed
> Extreme amounts of logging done by unauthorized Kafka clients
> -------------------------------------------------------------
>
> Key: KAFKA-9239
> URL: https://issues.apache.org/jira/browse/KAFKA-9239
> Project: Kafka
> Issue Type: Bug
> Components: clients
> Reporter: Anders Eknert
> Priority: Major
> Attachments: Screenshot 2019-11-27 at 11.32.38.png
>
>
> Having experimented some with custom authorization options for Kafka on the
> broker side, we have a bunch of clients that are no longer authorized. While
> that's expected and fine, we did not anticipate the level of logging that
> these unauthorized clients would spew out - putting our whole logging
> subsystem under heavy stress.
> The message log is similar to the one below:
> {code:java}
> 2019-11-25 10:08:10.262 WARN 1 --- [ntainer#0-0-C-1]
> o.a.k.c.consumer.internals.Fetcher : [Consumer clientId=sdp-ee-miami-0,
> groupId=sdp-ee-miami] Not authorized to read from topic sdp.ee-miami.
> {code}
> In just 4 hours this same message was repeated about a hundred million times
> ( ! ) in the worst offending client, 74 million times in the next one and 72
> million times in the third.
> We will roll out customized burst filters to suppress this on the client
> loggers, but it would of course be best if this was fixed in the client.
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