Github user andrewor14 commented on the pull request:
https://github.com/apache/spark/pull/8218#issuecomment-137266073
> No, there's one kind of authentication. I don't know what's this
"handshake" you talk about.
What? I'm talking about the shuffle secret the executor container needs
when it initially registers with the shuffle service:
https://github.com/apache/spark/blob/6cd98c1878a9c5c6475ed5974643021ab27862a7/yarn/src/main/scala/org/apache/spark/deploy/yarn/ExecutorRunnable.scala#L116.
The whole motivation for adding that in the first place is for app-level
authentication during the registration.
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