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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