public class UnmanagedAMLauncher
extends Object
The UnmanagedLauncher is a simple client that launches and unmanaged AM. An
unmanagedAM is an AM that is not launched and managed by the RM. The client
creates a new application on the RM and negotiates a new attempt id. Then it
waits for the RM app state to reach be YarnApplicationState.ACCEPTED after
which it spawns the AM in another process and passes it the container id via
env variable Environment.CONTAINER_ID. The AM can be in any
language. The AM can register with the RM using the attempt id obtained
from the container id and proceed as normal.
The client redirects app stdout and stderr to its own stdout and
stderr and waits for the AM process to exit. Then it waits for the RM to
report app completion.