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https://issues.apache.org/jira/browse/KAFKA-8287?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Boyang Chen resolved KAFKA-8287.
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Resolution: Invalid
We don't want to do it for now because there are existing use cases where
`client.id` is expected to be duplicate across different stream instances for
request throttling purpose.
> JVM global map to fence duplicate client id
> -------------------------------------------
>
> Key: KAFKA-8287
> URL: https://issues.apache.org/jira/browse/KAFKA-8287
> Project: Kafka
> Issue Type: Sub-task
> Components: streams
> Reporter: Boyang Chen
> Assignee: Boyang Chen
> Priority: Major
>
> After change in https://issues.apache.org/jira/browse/KAFKA-8285, the two
> stream instances scheduled on same JVM will be mutually affected if they
> accidentally assign same client.id, since the thread-id becomes local now.
> The solution is to build a global concurrent map for solving conflict if two
> threads happen to be having the same client.id.
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