[jira] [Resolved] (KAFKA-9481) Improve TaskMigratedException handling on Stream thread

["Guozhang Wang (Jira)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/KAFKA-9481?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Guozhang Wang resolved KAFKA-9481.
----------------------------------
    Fix Version/s: 2.6.0
       Resolution: Fixed

> Improve TaskMigratedException handling on Stream thread
> -------------------------------------------------------
>
>                 Key: KAFKA-9481
>                 URL: https://issues.apache.org/jira/browse/KAFKA-9481
>             Project: Kafka
>          Issue Type: Improvement
>          Components: streams
>            Reporter: Guozhang Wang
>            Assignee: Guozhang Wang
>            Priority: Major
>             Fix For: 2.6.0
>
>
> Today we handle TaskMigratedException as one-task at a time, when 1) producer got fenced, 2) consumer got fenced, 3) adding records to closed tasks.
> When 1) and 2) happens, all tasks hosted by that thread should have migrated; and for 3) it only happens when we are closing a task but not clearing its corresponding record buffer.
> So a better exception handling is first better fixing 3) to also clear the record buffer when closing a task (clean or dirty), and then for 1/2) we can always treat it as all-tasks-are-migrated.



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