Github user StephanEwen commented on the issue:
https://github.com/apache/flink/pull/5448
There is no problem reusing old keys, if their default unit was "bytes",
because the `MemorySize.parse(...)` interprets a number as bytes, if there is
no unit attached to it.
I did not realize that you switched the config keys already - in that case
we need to backwards support the old keys as well. Also, we need to update all
the shell scripts (`config.sh`, `jobmanager.sh`, `taskmanager.sh` and so on) to
be consistent with the new config keys.
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