Github user vanzin commented on the issue:
https://github.com/apache/spark/pull/18929
They're there mainly to declare the constant as a public API that must not
change. (I'm not sure whether mima captures changes in constant values, since
that's a binary breaking change, but that's the spirit of having these
constants.)
I didn't change all of the usages when I introduced them because it would
be really noisy. There are also a whole bunch of other constants that could be
re-used throughout the code (basically all the constants declared in
`SparkLauncher`). But I think there's no real need to change this - we can
encourage new code to use the constants, but leave the old code there until it
needs to be changed, to avoid noise.
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