[KAFKA-10090] Misleading warnings: The configuration was supplied but isn't a known config

• Type: Improvement
• Status: Resolved
• Priority: Major
• Resolution: Fixed
• Affects Version/s: 2.5.0
• Fix Version/s: 2.8.0
• Component/s: clients
• Assignee: Chia-Ping Tsai
• Reporter: Robert Wruck
• Created: 03/Jun/20 10:07
• Updated: 03/Dec/20 02:34
• Resolved: 03/Dec/20 02:34

Description

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.

 

Issue Links

• links to: GitHub Pull Request #8826