Package org.apache.hadoop.yarn.applications.unmanagedamlauncher

Class UnmanagedAMLauncher

java.lang.Object

org.apache.hadoop.yarn.applications.unmanagedamlauncher.UnmanagedAMLauncher

public class UnmanagedAMLauncher
extends java.lang.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.

Field Summary

Fields

Modifier and Type	Field	Description
protected org.apache.hadoop.yarn.client.api.YarnClient	rmClient

Constructor Summary

Constructors

Constructor	Description
UnmanagedAMLauncher()
UnmanagedAMLauncher(org.apache.hadoop.conf.Configuration conf)

Method Summary

Modifier and Type	Method	Description
boolean	init(java.lang.String[] args)
void	launchAM(org.apache.hadoop.yarn.api.records.ApplicationAttemptId attemptId)
static void	main(java.lang.String[] args)
boolean	run()

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Field Detail

rmClient

protected org.apache.hadoop.yarn.client.api.YarnClient rmClient

Constructor Detail

UnmanagedAMLauncher

public UnmanagedAMLauncher(org.apache.hadoop.conf.Configuration conf)
                    throws java.lang.Exception

Throws:

java.lang.Exception

UnmanagedAMLauncher

public UnmanagedAMLauncher()
                    throws java.lang.Exception

Throws:

java.lang.Exception

Method Detail

main

public static void main(java.lang.String[] args)

Parameters:

args - Command line arguments

init

public boolean init(java.lang.String[] args)
             throws org.apache.commons.cli.ParseException

Throws:

org.apache.commons.cli.ParseException

launchAM

public void launchAM(org.apache.hadoop.yarn.api.records.ApplicationAttemptId attemptId)
              throws java.io.IOException,
                     org.apache.hadoop.yarn.exceptions.YarnException

Throws:

java.io.IOException

org.apache.hadoop.yarn.exceptions.YarnException

run

public boolean run()
            throws java.io.IOException,
                   org.apache.hadoop.yarn.exceptions.YarnException

Throws:

java.io.IOException

org.apache.hadoop.yarn.exceptions.YarnException