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https://issues.apache.org/jira/browse/KAFKA-9656?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Jason Gustafson resolved KAFKA-9656.
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Fix Version/s: 2.6.0
Resolution: Fixed
> TxnOffsetCommit should not return COORDINATOR_LOADING error for old request
> versions
> ------------------------------------------------------------------------------------
>
> Key: KAFKA-9656
> URL: https://issues.apache.org/jira/browse/KAFKA-9656
> Project: Kafka
> Issue Type: Bug
> Reporter: Jason Gustafson
> Assignee: Boyang Chen
> Priority: Major
> Fix For: 2.6.0
>
>
> In KAFKA-7296, we fixed a bug which causes the producer to enter a fatal
> state when the COORDINATOR_LOADING_IN_PROGRESS error is received. The impact
> of this bug in streams was that the application would crash. Generally we
> want users to upgrade to a later client version, but in some cases, this
> takes a long time. I am suggesting here that we revert the behavior change on
> the broker for older versions of TxnOffsetCommit. For versions older than 2
> (which was introduced in 2.3), rather than returning
> COORDINATOR_LOADING_IN_PROGRESS, we can return COORDINATOR_NOT_AVAILABLE.
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