[jira] [Created] (KAFKA-13160) Fix BrokerConfigHandler to expect empty string as the resource name for dynamic default broker configs in KRaft

["Ryan Dielhenn (Jira)" <ji...@apache.org>]

Ryan Dielhenn created KAFKA-13160:
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             Summary: Fix BrokerConfigHandler to expect empty string as the resource name for dynamic default broker configs in KRaft
                 Key: KAFKA-13160
                 URL: https://issues.apache.org/jira/browse/KAFKA-13160
             Project: Kafka
          Issue Type: Bug
    Affects Versions: 3.0.0
            Reporter: Ryan Dielhenn
            Assignee: Ryan Dielhenn
             Fix For: 3.0.0


In a ZK cluster, dynamic default broker configs are stored in the zNode /brokers/<default>. When these configs are sent to the brokers in a fetch response, the BrokerConfigHandler checks if the resource name is "<default>" to do a default update and converts the resource name to an integer otherwise to do a per-broker config update. In KRaft dynamic default broker configs are serialized in the quorum with empty string instead of "<default>". This was causing the BrokerConfigHandler to throw a NumberFormatException for dynamic default broker configs since the resource name for them is not "<default>" or a singular integer. This handler should be fixed to expect empty string for the dynamic default broker configs if using KRaft.



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