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https://issues.apache.org/jira/browse/KAFKA-20835?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=18099036#comment-18099036
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Chia-Ping Tsai commented on KAFKA-20835:
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Maybe the Controller can verify all configs and consolidate all errors to
provide better debug details to users?
> Group-level alter-config RPC fails, if single group config is invalid
> ---------------------------------------------------------------------
>
> Key: KAFKA-20835
> URL: https://issues.apache.org/jira/browse/KAFKA-20835
> Project: Kafka
> Issue Type: Bug
> Components: group-coordinator
> Reporter: Matthias J. Sax
> Priority: Minor
>
> ControllerConfigurationValidator gets the full post-alter override map, not
> just the altered keys. So if a broker bound is narrowed after an override was
> set, GroupConfig.validate() rejects the stale value on every later alter –
> even one that doesn't touch it.
> Repro: set consumer.session.timeout.ms=90000 on a group, restart controller
> with group.consumer.max.session.timeout.ms=60000, then try to alter
> consumer.heartbeat.interval.ms on the same group -> INVALID_CONFIG on the
> session timeout.
> Impact: the group is stuck until the stale key is fixed or deleted.
> Validation is all-or-nothing per resource, and throws on the first violation,
> so multiple stale keys must all be repaired in one request, discovered one
> error at a time.
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