[jira] [Updated] (KAFKA-16836) Suspend reason of standby update listener is not correct

["Bruno Cadonna (Jira)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/KAFKA-16836?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Bruno Cadonna updated KAFKA-16836:
----------------------------------
    Affects Version/s: 3.8.0

> Suspend reason of standby update listener is not correct
> --------------------------------------------------------
>
>                 Key: KAFKA-16836
>                 URL: https://issues.apache.org/jira/browse/KAFKA-16836
>             Project: Kafka
>          Issue Type: Bug
>          Components: streams
>    Affects Versions: 3.7.0, 3.8.0
>            Reporter: Bruno Cadonna
>            Priority: Major
>
> The standby update listener introduced in KIP-988 takes a suspend reason in {{standbyUpdateListener.onUpdateSuspended()}}. The reason is determined in {{StoreChangelogReader#unregister()}} based on the state of the standby task [1]. However, {{unregister()}} is called in the state updater and in the state updater the state of the standby is always {{RUNNING}} since the state updater never changes the state of a task. So the standby task will always have {{PROMOTED}} as suspend reason, even if the standby is migrated.  
> [1] https://github.com/apache/kafka/blob/83110e2d425b49fed8ad5fdc6e93579423c73289/streams/src/main/java/org/apache/kafka/streams/processor/internals/StoreChangelogReader.java#L1064



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