ml.shifu.guagua.master

Class AbstractMasterCoordinator.MasterElectionCommand

java.lang.Object

ml.shifu.guagua.BasicCoordinator.BasicCoordinatorCommand

ml.shifu.guagua.master.AbstractMasterCoordinator.MasterElectionCommand

All Implemented Interfaces:

BasicCoordinator.CoordinatorCommand

Enclosing class:

AbstractMasterCoordinator<MASTER_RESULT extends Bytable,WORKER_RESULT extends Bytable>

protected class AbstractMasterCoordinator.MasterElectionCommand
extends BasicCoordinator.BasicCoordinatorCommand

Elect master from several backup masters.

Wait until it is the first bid, then it is elected as master.

Since fail-over in Hadoop map-reduce tasks is very fast. Using multiple-master is not a good choice especially time out is too large.

Multiple masters are used in environment in which no fail-over.

Constructor Summary

Constructors

Constructor and Description
MasterElectionCommand(String appId)

Method Summary

Modifier and Type	Method and Description
void	doExecute() Real method to do coordinator operation.

Methods inherited from class ml.shifu.guagua.BasicCoordinator.BasicCoordinatorCommand

execute

Methods inherited from class java.lang.Object

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

Constructor Detail

MasterElectionCommand

public MasterElectionCommand(String appId)

Method Detail

doExecute

public void doExecute()
               throws org.apache.zookeeper.KeeperException,
                      InterruptedException

Description copied from class: BasicCoordinator.BasicCoordinatorCommand

Real method to do coordinator operation.

Specified by:

doExecute in class BasicCoordinator.BasicCoordinatorCommand

Throws:

org.apache.zookeeper.KeeperException

InterruptedException