Package org.apache.hadoop.tools.dynamometer

Class ApplicationMaster

java.lang.Object

org.apache.hadoop.tools.dynamometer.ApplicationMaster

@Public
@Unstable
public class ApplicationMaster
extends java.lang.Object

The ApplicationMaster for Dynamometer. This will launch DataNodes in YARN containers. If the RPC address of a NameNode is specified, it will configure the DataNodes to talk to that NameNode. Else, a NameNode will be launched as part of this YARN application. This does not implement any retry/failure handling. TODO: Add proper retry/failure handling

The AM will persist until it has run for a period of time equal to the timeout specified or until the application is killed.

If the NameNode is launched internally, it will upload some information onto the remote HDFS instance (i.e., the default FileSystem) about its hostname and ports. This is in the location determined by the DynoConstants.DYNAMOMETER_STORAGE_DIR and DynoConstants.NN_INFO_FILE_NAME constants and is in the Properties file format. This is consumed by this AM as well as the Client to determine how to contact the NameNode.

Information about the location of the DataNodes is logged by the AM.

Constructor Summary

Constructors

Constructor	Description
ApplicationMaster()

Method Summary

Modifier and Type	Method	Description
boolean	init(java.lang.String[] args)	Parse command line options.
static void	main(java.lang.String[] args)
boolean	run()	Main run function for the application master.

Methods inherited from class java.lang.Object

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

Constructor Detail

ApplicationMaster

public ApplicationMaster()

Method Detail

main

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

Parameters:

args - Command line args

init

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

Parse command line options.

Parameters:

args - Command line args

Returns:

Whether init successful and run should be invoked

Throws:

org.apache.commons.cli.ParseException - on error while parsing options

run

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

Main run function for the application master.

Returns:

True if the application completed successfully; false if if exited unexpectedly, failed, was killed, etc.

Throws:

org.apache.hadoop.yarn.exceptions.YarnException - for issues while contacting YARN daemons

java.io.IOException - for other issues

java.lang.InterruptedException - when the thread is interrupted