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https://issues.apache.org/jira/browse/KAFKA-15909?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Chia-Ping Tsai resolved KAFKA-15909.
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Resolution: Fixed
> Throw error when consumer configured with empty/whitespace-only group.id for
> LegacyKafkaConsumer
> ------------------------------------------------------------------------------------------------
>
> Key: KAFKA-15909
> URL: https://issues.apache.org/jira/browse/KAFKA-15909
> Project: Kafka
> Issue Type: Sub-task
> Components: clients, consumer
> Reporter: Kirk True
> Assignee: PoAn Yang
> Priority: Major
> Fix For: 4.0.0
>
>
> Per
> [KIP-289|https://cwiki.apache.org/confluence/display/KAFKA/KIP-289%3A+Improve+the+default+group+id+behavior+in+KafkaConsumer],
> the use of an empty value for {{group.id}} configuration was deprecated back
> in 2.2.0.
> In 3.7, the {{AsyncKafkaConsumer}} implementation will throw an error (see
> KAFKA-14438).
> This task is to update the {{LegacyKafkaConsumer}} implementation to throw an
> error in 4.0.
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