Github user srowen commented on the pull request:
https://github.com/apache/spark/pull/12631#issuecomment-213699239
Yes, on a system with Maven < 3.3.9 installed, you always have to pass
`--force`. This would at least make it optional on the second or subsequent
run.
Ideally we could even auto-detect the `mvn` version, which isn't too hard,
and then download and/or use the downloaded copy only if the installed one is
too old. What do you think about trying that? I wouldn't want to do it if it
ends up being a lot of complexity, but ought to be a few more lines. We could
even remove `--force` then, I suppose, since you have to download it if your
local maven is too old.
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