I was reading from the HortonWorks blog:
"How MapReduce shuffle takes advantage of NM's Auxiliary-services
The Shuffle functionality required to run a MapReduce (MR) application is
implemented as an Auxiliary Service. This service starts up a Netty Web Server,
and knows how to handle MR specific shuffle requests from Reduce tasks. The MR
AM specifies the service id for the shuffle service, along with security tokens
that may be required. The NM provides the AM with the port on which the shuffle
service is running which is passed onto the Reduce tasks."
How does the AM get the service ID and the port?
Thanks,
John
