Github user ex00 commented on the issue:
https://github.com/apache/flink/pull/2517
Hello, zentol.
>but, i just realized that without this you would end up with concurrency
issues since multiple register calls can be active at the same time...I'll have
to think about this for a bit.
I'm propose return the implement where I was creating new
FrontMetricGroup's and put it in list in the MetricRegistry constructor. What
do you think about it?
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