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Posted to jira@kafka.apache.org by "Rajini Sivaram (Jira)" <ji...@apache.org> on 2021/07/07 08:36:00 UTC

[jira] [Resolved] (KAFKA-13029) FindCoordinators batching can break consumers during rolling upgrade

     [ https://issues.apache.org/jira/browse/KAFKA-13029?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Rajini Sivaram resolved KAFKA-13029.
------------------------------------
    Resolution: Fixed

> FindCoordinators batching can break consumers during rolling upgrade
> --------------------------------------------------------------------
>
>                 Key: KAFKA-13029
>                 URL: https://issues.apache.org/jira/browse/KAFKA-13029
>             Project: Kafka
>          Issue Type: Bug
>          Components: consumer
>            Reporter: Rajini Sivaram
>            Assignee: Rajini Sivaram
>            Priority: Blocker
>             Fix For: 3.0.0
>
>
> The changes made under KIP-699 assume that it is always safe to use unbatched mode since we move from batched to unbatched and cache the value forever in clients if a broker doesn't support batching. During rolling upgrade, if a request is sent to an older broker, we move from batched to unbatched mode. The consumer (admin client as well I think) disables batching and future requests to upgraded brokers will fail because we attempt to use unbatched requests with a newer version of the request.



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