Github user zentol commented on the issue:
https://github.com/apache/flink/pull/2418
Well this won't be pretty. The problem lies with the "name" check we have
to do since we mustn't modify the underlying map, since it belongs to the
metric groups.
As you showed in your example we need a check in `HashtableWrapper#get()`.
But we also have to make sure that this check is done for all possible ways
the Hashtable values could get accessed.
This includes the `Sets` returned by `keySet()`, `values` and `entrySet`
and the `Iterators` returned by these `Sets`.
I've pushed a version that does exactly this. One issue I've already found
is that we can no longer filter out characters from the variables.
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