Log errors for unrecognized config options
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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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