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https://issues.apache.org/jira/browse/KAFKA-181?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13423466#comment-13423466
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Jay Kreps commented on KAFKA-181:
---------------------------------
The assumption is that the properties are only used during initialization and
are passed into other components as simple constructor args. I notice this
isn't universally true, but is generally a good pattern so we could refactor
the cases where it isn't true.
So basically it should be safe to check at the end of kafka server startup and
warn about any unused properties.
> Log errors for unrecognized config options
> ------------------------------------------
>
> Key: KAFKA-181
> URL: https://issues.apache.org/jira/browse/KAFKA-181
> Project: Kafka
> Issue Type: Improvement
> Components: core
> Reporter: Joel Koshy
> Fix For: 0.8
>
>
> Currently, unrecognized config options are silently ignored. Notably, if a
> config has a typo or if a deprecated config is used, then there is no warning
> issued and defaults are assumed. One can argue that the broker or a consumer
> or a producer with an unrecognized config option should not even be allowed
> to start up especially if defaults are silently assumed, but it would be good
> to at least log an error.
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