Github user mxm commented on the issue:
https://github.com/apache/flink/pull/2187
I moved one existing environment variable `FLINK_CONF_DIR` to
`ConfigConstants`. I added the `FLINK_LIB_DIR` environment variable to load a
library folder (optional). I'm not sure whether we should add them to the
documentation since they are set by the bash scripts and shouldn't be exposed
to the user.
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