Github user vanzin commented on the pull request:
https://github.com/apache/spark/pull/6676#issuecomment-110567688
> For that, env variable will not work.
You have not explained why that won't work. The only difference is that
with the env variable it's slightly easier to get the secret. (i.e.., just read
a file in `/proc` instead of running `jmap` to get the data from the other
app's heap).
So there's absolutely no extra security from using stdin, just more
complicated code.
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