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https://issues.apache.org/jira/browse/KAFKA-8179?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16807275#comment-16807275
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ASF GitHub Bot commented on KAFKA-8179:
---------------------------------------
guozhangwang commented on pull request #6528: KAFKA-8179: Part I, Bump up
consumer protocol to v2
URL: https://github.com/apache/kafka/pull/6528
1. Add new fields of subscription / assignment and bump up consumer protocol
to v2.
2. Update tests to make sure old versioned protocol can be successfully
deserialized, and new versioned protocol can be deserialized by old byte code.
### Committer Checklist (excluded from commit message)
- [ ] Verify design and implementation
- [ ] Verify test coverage and CI build status
- [ ] Verify documentation (including upgrade notes)
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> Incremental Rebalance Protocol for Kafka Consumer
> -------------------------------------------------
>
> Key: KAFKA-8179
> URL: https://issues.apache.org/jira/browse/KAFKA-8179
> Project: Kafka
> Issue Type: Improvement
> Components: consumer
> Reporter: Guozhang Wang
> Assignee: Guozhang Wang
> Priority: Major
>
> Recently Kafka community is promoting cooperative rebalancing to mitigate the
> pain points in the stop-the-world rebalancing protocol. This ticket is
> created to initiate that idea at the Kafka consumer client, which will be
> beneficial for heavy-stateful consumers such as Kafka Streams applications.
> In short, the scope of this ticket includes reducing unnecessary rebalance
> latency due to heavy partition migration: i.e. partitions being revoked and
> re-assigned. This would make the built-in consumer assignors (range,
> round-robin etc) to be aware of previously assigned partitions and be sticky
> in best-effort.
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