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https://issues.apache.org/jira/browse/KAFKA-6535?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16393457#comment-16393457
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Matthias J. Sax commented on KAFKA-6535:
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Yes. It's a long though (not and integer). We should pass this config when 
creating repartitions topics (cf. {{InternalTopicManager}}).

> Set default retention ms for Streams repartition topics to infinity
> -------------------------------------------------------------------
>
>                 Key: KAFKA-6535
>                 URL: https://issues.apache.org/jira/browse/KAFKA-6535
>             Project: Kafka
>          Issue Type: Improvement
>          Components: streams
>            Reporter: Guozhang Wang
>            Priority: Major
>              Labels: needs-kip, newbie
>
> After KIP-220 / KIP-204, repartition topics in Streams are transient, so it 
> is better to set its default retention to infinity to allow any records be 
> pushed to it with old timestamps (think: bootstrapping, re-processing) and 
> just rely on the purging API to keeping its storage small.



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