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https://issues.apache.org/jira/browse/KAFKA-19444?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Mickael Maison resolved KAFKA-19444.
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Resolution: Fixed
> SASL GSSAPI not working with librdkafka and AK 4.x
> --------------------------------------------------
>
> Key: KAFKA-19444
> URL: https://issues.apache.org/jira/browse/KAFKA-19444
> Project: Kafka
> Issue Type: Bug
> Affects Versions: 4.0.0
> Reporter: Emanuele Sabellico
> Assignee: Ismael Juma
> Priority: Critical
> Fix For: 4.0.1, 4.1.0
>
>
> By running librdkafka with AK 4.0 we see that SASL GSSAPI isn't working.
> The feature is missing because librdkafka is incorrectly checking for
> JoinGroup v0 only and not v0+.
> When testing librdkafka versions with 4.0 we missed this case so JoinGroup v0
> and v1 were removed.
> A [fix|https://github.com/confluentinc/librdkafka/pull/5131] is already
> merged in librdkafka and will be released in v2.11.0.
> Enabling back the deprecated JoinGroup RPC versions will help the users
> looking to continue using Kerberos authentication without upgrading.
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