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https://issues.apache.org/jira/browse/KAFKA-5171?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Jason Gustafson resolved KAFKA-5171.
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Resolution: Fixed
Issue resolved by pull request 3086
[https://github.com/apache/kafka/pull/3086]
> TC should not accept empty string transactional id
> --------------------------------------------------
>
> Key: KAFKA-5171
> URL: https://issues.apache.org/jira/browse/KAFKA-5171
> Project: Kafka
> Issue Type: Sub-task
> Components: core
> Reporter: Guozhang Wang
> Fix For: 0.11.0.0
>
>
> Currently on TC, both `null` and `empty string` will be accepted and a new
> pid will be returned. However, on the producer client end empty string
> transactional id is not allowed, and if user specifically set it with empty
> string RTE will be thrown.
> We can make TC's behavior consistent with client to also reject empty string
> transactional id.
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