[jira] [Resolved] (KAFKA-9656) TxnOffsetCommit should not return COORDINATOR_LOADING error for old request versions

["Jason Gustafson (Jira)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/KAFKA-9656?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Jason Gustafson resolved KAFKA-9656.
------------------------------------
    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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