Github user sudheeshkatkam commented on the pull request:
https://github.com/apache/drill/pull/495#issuecomment-217221522
Good points. I added a comment in code, but it does not completely address
your concerns.
Unfortunately, not all class (e.g. RootAllocator) can be instrumented for
metrics if the single instance is part of a contextual object. Static instance
is fine according to [library
doc](https://dropwizard.github.io/metrics/3.1.0/getting-started/#the-registry).
This means maintaining state in a static object. Is there a workaround?
AFAIK we do not provide a way to run multiple drillbits in the same JVM in
production use cases. You are right, metrics will conflict for unit tests (as
is, right now).
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