Github user StephanEwen commented on the issue:
https://github.com/apache/flink/pull/2418
Looks good to me!
The only not-so-nice thing is that we have to convert the `Map` to a
`HashTable` for every metric. Given how we tried to optimize the metric
creation overhead, this it pretty tough.
Its seems very hard to "disguise" a map as a hashtable, though...
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