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https://issues.apache.org/jira/browse/KAFKA-21213?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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sanghyeok An updated KAFKA-21213:
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Component/s: group-coordinator
streams
> Reject leading and trailing whitespace in Streams custom assignor names
> -----------------------------------------------------------------------
>
> Key: KAFKA-21213
> URL: https://issues.apache.org/jira/browse/KAFKA-21213
> Project: Kafka
> Issue Type: Bug
> Components: group-coordinator, streams
> Reporter: sanghyeok An
> Assignee: sanghyeok An
> Priority: Minor
>
> Broker-side Streams custom assignor registration and group configuration
> handle surrounding whitespace differently.
> {{GroupCoordinatorConfig.streamsGroupAssignors()}} uses the name returned by
> {{TaskAssignor.name()}} unchanged, while the group configuration
> {{streams.assignor.name}} applies {{trim()}} during STRING parsing.
> For a custom assignor returning {{{}" regional "{}}}:
> * It can be used as the default assignor when registered first and no group
> override is set.
> * Explicitly setting {{streams.assignor.name=regional}} is rejected because
> it does not match the registered name.
> * Including the surrounding whitespace in the setting also fails because
> parsing removes it.
> * GROUP {{DescribeConfigs}} parses the default name as {{{}regional{}}}, so
> reapplying the reported value can also fail.
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