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Posted to jira@kafka.apache.org by "Matthias J. Sax (Jira)" <ji...@apache.org> on 2022/11/08 00:20:00 UTC

[jira] [Commented] (KAFKA-14294) Kafka Streams should commit transaction when no records are processed

    [ https://issues.apache.org/jira/browse/KAFKA-14294?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17630098#comment-17630098 ] 

Matthias J. Sax commented on KAFKA-14294:
-----------------------------------------

Why do you think we don't commit? Based on the code, we should commit: StreamTask has a flag `commitNeeded` that is set to `true` after a punctuation executed.

> Kafka Streams should commit transaction when no records are processed
> ---------------------------------------------------------------------
>
>                 Key: KAFKA-14294
>                 URL: https://issues.apache.org/jira/browse/KAFKA-14294
>             Project: Kafka
>          Issue Type: Improvement
>          Components: streams
>    Affects Versions: 3.2.1
>            Reporter: Vicky Papavasileiou
>            Priority: Major
>
> Currently, if there are no records to process in the input topic, a transaction does not commit. If a custom punctuator code is writing to a state store (which is common practice) the producer gets fenced when trying to write to the changelog topic. This throws a TaskMigratedException and causes a rebalance. 
> A better approach would be to commit a transaction even when there are no records processed as to allow the punctuator to make progress. 



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