Github user StephanEwen commented on the pull request:
https://github.com/apache/flink/pull/952#issuecomment-127053317
If we want to unmodifiable configuration to be usable like any other
configuration, it needs to be a subclass that overrides all mutating methods.
To make sure that is safe, it should also have a test that sees that all
"set*" methods from the superclass are overridden.
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