[jira] [Created] (KAFKA-20835) Group-level alter-config RPC fails, if single group config is invalid

["Matthias J. Sax (Jira)" <ji...@apache.org>]

Matthias J. Sax created KAFKA-20835:
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             Summary: 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


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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