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https://issues.apache.org/jira/browse/KAFKA-7851?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16749793#comment-16749793
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Stanislav Kozlovski commented on KAFKA-7851:
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[~cri] it's also worth mentioning that we have a KIP under way which implements
part of that proposal for the Connect framework -
https://cwiki.apache.org/confluence/display/KAFKA/KIP-415%3A+Incremental+Cooperative+Rebalancing+in+Kafka+Connect
> Continue data streaming while rebalancing
> -----------------------------------------
>
> Key: KAFKA-7851
> URL: https://issues.apache.org/jira/browse/KAFKA-7851
> Project: Kafka
> Issue Type: Improvement
> Reporter: Christian Richter
> Priority: Major
>
> At the moment, consumers will not receive further data when a rebalancing is
> triggered. In cases where many hundreds of consumers are re-balanced, the
> data stream is significantly interrupted by the rebalancing, especially as
> the time for the rebalancing is longer for many consumers.
> By still streaming data to the consumers till the new generation is put in
> place, the data stream would be more consistent and stable.
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