[jira] [Commented] (KAFKA-13501) Avoid state restore via rebalance if standbys are enabled

["Matthias J. Sax (Jira)" <ji...@apache.org>]

    [ https://issues.apache.org/jira/browse/KAFKA-13501?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17497196#comment-17497196 ] 

Matthias J. Sax commented on KAFKA-13501:
-----------------------------------------

I just discovered https://issues.apache.org/jira/browse/KAFKA-12486 and now I am wondering to what extend both ticket are related? \cc [~ableegoldman] 

[~sagarrao] you worked on K12486 – can you remember the details?

> Avoid state restore via rebalance if standbys are enabled
> ---------------------------------------------------------
>
>                 Key: KAFKA-13501
>                 URL: https://issues.apache.org/jira/browse/KAFKA-13501
>             Project: Kafka
>          Issue Type: Improvement
>          Components: streams
>            Reporter: Matthias J. Sax
>            Assignee: Sagar Rao
>            Priority: Major
>
> There are certain scenario in which Kafka Streams wipes out local state and rebuilt it from scratch. This is a thread local cleanup, ie, no rebalance is triggered, and we end up with an offline task until state restoration finished.
> If standby tasks are enable, it might actually make sense to trigger a rebalance instead, to get the task re-assigned to the instance hosting the standby so get the task active again quickly.



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