Github user paul-rogers commented on the issue:
https://github.com/apache/drill/pull/647
Two ways to test.
First, try the fix manually. Start Drill once without the env var set to
ensure Drill uses the default. Then, set the env var and ensure that Drill uses
the correct value.
Second, would be a unit test. I'm not familiar with any existing ZK unit
tests. Do any of the other committers know if we have such tests? Something
that validates Drillbit registration, etc? If so, then that test can be
modified for this use case.
But, there is one gotcha: in Java, env vars are read-only, there is no way
to set env vars in a test (that I've ever found.) Anyone have a work-around?
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