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https://issues.apache.org/jira/browse/KAFKA-13160?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Ryan Dielhenn updated KAFKA-13160:
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    Description: In a ZK cluster, dynamic default broker configs are stored in 
the zNode /brokers/<default>. When these config snapshots are processed by the 
brokers, 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 
single integer. This handler should be fixed to expect empty string as the 
resource name for the dynamic default broker configs if using KRaft.  (was: 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 as the 
resource name for the dynamic default broker configs if using KRaft.)

> 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
>            Priority: Blocker
>             Fix For: 3.0.0
>
>
> In a ZK cluster, dynamic default broker configs are stored in the zNode 
> /brokers/<default>. When these config snapshots are processed by the brokers, 
> 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 single integer. This handler should be fixed to expect empty string as the 
> resource name for the dynamic default broker configs if using KRaft.



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