[jira] [Created] (KAFKA-14757) Kafka Cooperative Sticky Assignor results in significant duplicate consumption

["Siddharth Anand (Jira)" <ji...@apache.org>]

Siddharth Anand created KAFKA-14757:
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             Summary: 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


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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