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https://issues.apache.org/jira/browse/KAFKA-8179?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16892184#comment-16892184
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ASF GitHub Bot commented on KAFKA-8179:
---------------------------------------
ableegoldman commented on pull request #7108: KAFKA-8179: add public
ConsumerPartitionAssignor interface
URL: https://github.com/apache/kafka/pull/7108
[Subtask JIRA](https://issues.apache.org/jira/browse/KAFKA-8703)
Main changes of this PR
* Deprecate old consumer.internal.PartitionAssignor and add public
consumer.ConsumerPartitionAssignor with all OOTB assignors migrated to new
interface
* Refactor assignor's assignment/subscription related classes for easier to
evolve API
* Removed version number from classes as it is only needed for
serialization/deserialization
Other previously-discussed cleanup included in this PR:
* Remove Assignment.error added in [pt
1](https://github.com/apache/kafka/pull/6528/files)
* Remove ConsumerCoordinator#adjustAssignment added in [pt
2](https://github.com/apache/kafka/pull/6778/)
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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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