Robert Wruck created KAFKA-10090:
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Summary: Misleading warnings: The configuration was supplied but
isn't a known config
Key: KAFKA-10090
URL: https://issues.apache.org/jira/browse/KAFKA-10090
Project: Kafka
Issue Type: Improvement
Components: clients
Affects Versions: 2.5.0
Reporter: Robert Wruck
In our setup (using Spring cloud stream Kafka binder), we see log messages like:
{{The configuration 'ssl.keystore.password' was supplied but isn't a known
config}}
logged by org.apache.kafka.clients.admin.AdminClientConfig. The Kafka binder
actually uses SSL and security.protocol is set to SSL.
Looking through the code, a few things seem odd:
* The log message says "isn't a known config" but that's not true. It is
*known*, i.e. defined in ConfigDef, but not *used*.
* The method for detecting whether a config is actually *used* is not
complete. ChannelBuilders.channelBuilderConfigs() for example extracts the
configs to use for the created channel builder using *new
HashMap(config.values())* thus *get()* won't mark a config as used anymore.
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