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https://issues.apache.org/jira/browse/KAFKA-6144?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16226007#comment-16226007
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Matthias J. Sax commented on KAFKA-6144:
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[~astubbs] Is this a duplicate of KAFKA-6031 ?
> Allow state stores to serve stale reads during rebalance
> --------------------------------------------------------
>
> Key: KAFKA-6144
> URL: https://issues.apache.org/jira/browse/KAFKA-6144
> Project: Kafka
> Issue Type: New Feature
> Components: streams
> Reporter: Antony Stubbs
>
> Currently when expanding the KS cluster, the new node's partitions will be
> unavailable during the rebalance, which for large states can take a very long
> time, or for small state stores even more than a few ms can be a deal breaker
> for micro service use cases.
> One workaround is to allow stale data to be read from the state stores when
> use case allows.
> Relates to KAFKA-6145 - Warm up new KS instances before migrating tasks -
> potentially a two phase rebalance
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