Github user vanzin commented on the pull request:
https://github.com/apache/spark/pull/5664#issuecomment-96777107
The exception you're seeing is because YARN is doing validation of the cert
used by the Spark UI. I looked for a way to disable that in YARN but couldn't
find it - will ask around to see if someone knows.
You could install your own self-signed certs so that YARN can validate you
Spark cert, but that might be too much trouble to test this, since the
exception kinda shows it's working. If that cannot be disabled in YARN, we'll
need to document it though.
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