[jira] [Updated] (KAFKA-9568) Kstreams APPLICATION_SERVER_CONFIG is not updated with static membership

["Sophie Blee-Goldman (Jira)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/KAFKA-9568?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Sophie Blee-Goldman updated KAFKA-9568:
---------------------------------------
    Affects Version/s: 2.5.0

> Kstreams APPLICATION_SERVER_CONFIG is not updated with static membership
> ------------------------------------------------------------------------
>
>                 Key: KAFKA-9568
>                 URL: https://issues.apache.org/jira/browse/KAFKA-9568
>             Project: Kafka
>          Issue Type: Bug
>          Components: streams
>    Affects Versions: 2.4.0, 2.5.0
>            Reporter: David J. Garcia
>            Assignee: Sophie Blee-Goldman
>            Priority: Major
>             Fix For: 2.6.0
>
>
> A kstreams application with static membership, and StreamsConfg.APPLICATION_SERVER_CONFIG set, will NOT update old server config upon restart of application on new host.
> Steps to reproduce:
>  
>  # start two kstreams applications (with same consumer group) and enable static membership (and set application server config to <ip-addr>:<port>)
>  # kill one of the applications and restart it on a new host(with new ip) before timeout ends (so that rebalancing doesn't occur).
>  # the other kstreams application will now have an invalid application_server_config
> Possible fix:
> If an application restarts with a new host/identity..etc, it could trigger a "light-rebalance" where the other applications in the consumer group don't change partition assignments ,but instead just get their configuration updated.



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