Github user pwendell commented on the pull request:
https://github.com/apache/spark/pull/5382#issuecomment-91088355
Great to have an improvement here. One thing I don't understand, there are
two curved arrows from the SparkContext to the Executors/Workers. However, in
the upper arrow it is connected to the boundary of the Worker box and not the
boundary of the Executor box. Is this intentional?
I believe in theory, the process running the SparkContext should not need
to directly communicate with the Worker nodes. It should only directly
communicate with the Executor process.
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