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https://issues.apache.org/jira/browse/KAFKA-8575?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Matthias J. Sax updated KAFKA-8575:
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Fix Version/s: 4.0.0
> Investigate removing EAGER protocol & cleaning up task suspension in Streams
> rebalancing
> -----------------------------------------------------------------------------------------
>
> Key: KAFKA-8575
> URL: https://issues.apache.org/jira/browse/KAFKA-8575
> Project: Kafka
> Issue Type: Improvement
> Components: streams
> Affects Versions: 2.4.0
> Reporter: A. Sophie Blee-Goldman
> Priority: Critical
> Fix For: 4.0.0
>
>
> With KIP-429 the suspend/resume of tasks may have minimal gains while adding
> a lot of complexity and potential bugs. We should consider removing/cleaning
> it up and going a step further to remove the EAGER protocol from Streams
> entirely.
> Plan to remove this in 3.1/4.0, whichever comes after 3.0. This will make 3.0
> a bridge release for users upgrading from any version below 2.4, but they
> will still be able to do so in the usual two rolling bounces.
>
> *The upgrade path from 2.3 and below, to any \{to_version} higher than 3.1
> will be:*
> 1. During the first rolling bounce, upgrade the jars to a version between 2.4
> - 3.1 and add the UPGRADE_FROM config for whichever version you are upgrading
> from
> 2. During the second rolling bounce, upgrade the jars to the desired
> \{to_version} and remove the UPGRADE_FROM config
>
> EAGER will be effectively deprecated in 3.0 but not removed until the next
> version.
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