Sending an event from YARN to applications running on the cluster

[Charlie Wright]

Hello,

I was wondering how I could send an event from YARN to Spark applications 
running on the cluster. From what I gather, Spark uses the AMRMClient class to 
interface with YARN. How would I go about sending an event from the 
ResourceManager to the AMRMClient?

Any help is appreciated.

Thanks,
Charles.