Lars Volker created IMPALA-6521:

             Summary: Hidden flags should show up in /varz and should be 
printed in the logs during startup
                 Key: IMPALA-6521
             Project: IMPALA
          Issue Type: Bug
          Components: Backend
    Affects Versions: Impala 2.12.0
            Reporter: Lars Volker

Flags can be defined as hidden, which hides them from the help output. However, 
they are also hidden from /varz and from the logs during startup. This seems 
contradictory; we should make sure that we log it if a user enables a hidden 
flag / feature.

We could even consider adding a warning to the log and to the main debug page 
if hidden / experimental features are enabled.

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