Resource restriction of MPI process

[Applepleple]

I have read most of the codes in this project. First, this is a great implementation to enable MPI programs running in YARN clusters, but I still got concerns about how does AppMaster monitor the resource usage of the containers since the MPI processes have no connections with container processes.

To be specific, MPI processes are launched in AppMaster using Java Process while the containers only do some dependencies syncing work instead of the real users' logic.

Could you please give me some explanations on this or do you have any plans to improve this project?