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https://issues.apache.org/jira/browse/KAFKA-14757?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17693024#comment-17693024
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Siddharth Anand commented on KAFKA-14757:
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[~ocadaruma] We did not see the rebalance-in-progress exception in our consumer
logs.
If we were able to safely commit offsets during a rebalance, that might resolve
the duplicate consumption issue. It feels to me that there is not a safe-point
during rebalancing in the Cooperative Sticky Assignor as compared with the
Stop-the-world Range Assignor. Hence, during high traffic ramps, as consumers
are busy scaling out and incremental rebalancing takes places, there is a lot
of duplicate message production (e.g. >70% as witnessed in our production
environment).
> Kafka Cooperative Sticky Assignor results in significant duplicate consumption
> ------------------------------------------------------------------------------
>
> Key: KAFKA-14757
> URL: https://issues.apache.org/jira/browse/KAFKA-14757
> Project: Kafka
> Issue Type: Bug
> Components: consumer
> Affects Versions: 3.1.1
> Environment: AWS MSK (broker) and Spring Kafka (2.8.7) for use in
> Spring Boot consumers.
> Reporter: Siddharth Anand
> Priority: Critical
>
> Details may be found within the linked document:
> [Kafka Cooperative Sticky Assignor Issue : Duplicate Consumption |
> [https://docs.google.com/document/d/1E7qAwGOpF8jo_YhF4NwUx9CXxUGJmT8OhHEqIg7-GfI/edit?usp=sharing]]
> In a nutshell, we noticed that the Cooperative Sticky Assignor resulted in
> significant duplicate message consumption. During last year's F1 Grand Prix
> events and World Cup soccer events, our company's Kafka-based platform
> received live-traffic. This live traffic, coupled with autoscaled consumers
> resulted in as much as 70% duplicate message consumption at the Kafka
> consumers.
> In December 2022, we ran a synthetic load test to confirm that duplicate
> message consumption occurs during consumer scale out/in and Kafka partition
> rebalancing when using the Cooperative Sticky Assignor. This issue does not
> occur when using the Range Assignor.
>
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