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https://issues.apache.org/jira/browse/KAFKA-3547?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Ismael Juma resolved KAFKA-3547.
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Resolution: Fixed
Assignee: Grant Henke
And this is the relevant commit for trunk:
https://github.com/apache/kafka/commit/d7fc7cf6154592b7fea494a092e42ad9d45b98a0
> Broker does not disconnect client on unknown request
> ----------------------------------------------------
>
> Key: KAFKA-3547
> URL: https://issues.apache.org/jira/browse/KAFKA-3547
> Project: Kafka
> Issue Type: Bug
> Components: core
> Affects Versions: 0.9.0.0, 0.9.0.1
> Reporter: Magnus Edenhill
> Assignee: Grant Henke
> Priority: Critical
> Fix For: 0.10.0.0
>
>
> A regression in 0.9.0 causes the broker to not close a client connection when
> receiving an unsupported request.
> Two effects of this are:
> - the client is not informed that the request was not supported (even though
> a closed connection is a blunt indication it is infact some indication), the
> request will (hopefully) just time out on the client after some time,
> stalling sub-sequent operations.
> - the broker leaks the connection until the connection reaper brings it down
> or the client closes the connection
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