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 hadop map-reduce tasks is very fast. Using multiple-master is not a good choice expecially time out is too large.

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

Constructor Summary

Constructors

Constructor and Description
AbstractMasterCoordinator.MasterElectionCommand(String appId)

Method Summary

Methods

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

AbstractMasterCoordinator.MasterElectionCommand

public AbstractMasterCoordinator.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