Github user StephanEwen commented on the pull request:
https://github.com/apache/flink/pull/1031#issuecomment-132934917
I think the reason to not create a new environment every time was simply
that it was easier to write that way and it never hurt before. You can run
multiple programs on the same environment after all.
For tests, it is cleaner, though, to have a fresh one, as otherwise you may
"inherit" configuration from a previous test (as is the case with the
registered cache files).
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