Github user vanzin commented on the pull request:
https://github.com/apache/spark/pull/7243#issuecomment-119359707
> The endpoint is for messages from core to yarn if I am not wrong ?
If you look at `AMEndpoint`, it has a reference to the driver endpoint, so
you should be able to send messages to the driver. (For example, check the
`onStart` method which sends a message to the driver endpoint.)
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