Github user tgravescs commented on the pull request:
https://github.com/apache/spark/pull/12994#issuecomment-218177238
I'm not concerned with the downgrade case. It just won't find the file if
yarn isn't setting the recovery path any longer (it will create new one in
localdir) , but I don't see that as a big issue because if someone is
downgrading their cluster or turned off recovery they should kill everything
that is running.
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