[MapReduce-user] Application Master:

On Dec 20, 2011, at 4:05 PM, Ann Pal wrote:

Hi,
I had the following questions related to Yarn:
[1] How does the Application Master know where the data is, to give a list to Resource Manager? Is it talking to the Name Node?
Yes, it's the responsibility of the AM to talk to the NN to figure which hosts/racks it needs.
[2] How does Resource Manager interface with HDFS federation? How does it know which specific name node talk to?