Github user LosD commented on the issue:
https://github.com/apache/metamodel/pull/120
Hmmmm, good point.
The thing is that if it is in a cluster, it's hard to get the docker image
on the same instance (or even rack) as all the DBs it provides access to when
there's many of them, and that means that for chatty apps the indirection of MM
can become quite expensive.
OTOH, chatty apps are often a symptom of bad app or DB design (though there
is of course cases where it is unavoidable).
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