Github user rmetzger commented on the pull request:
https://github.com/apache/flink/pull/664#issuecomment-100805130
In Hadoop, the `UserConfig` would probably be a `Configuration` object with
key/value pairs.
In Flink, we are trying to get rid of these untyped maps.
Instead, I would recommend users to use a simple java class, like
```java
public static class MyConfig extends UserConfig {
public long someLongValue;
public int someInt;
// this is optional
public Map<String, String> toMap() { return null; }
}
```
It can be used in a similar way to a Configuration object, but the compiler
is able to check the types.
The `ParameterUtil` is implementing the UserConfig interface to expose the
configuration values through the Flink program & in the web interface.
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