Some Eclipse Foundation services are deprecated, or will be soon. Please ensure you've read this important communication.

Bug 325928

Summary:	Provide FailoverMonitor server and FailoverAgents to coordinate fail-over scenarios
Product:	[Modeling] EMF	Reporter:	Eike Stepper <stepper>
Component:	cdo.core	Assignee:	Eike Stepper <stepper>
Status:	CLOSED FIXED	QA Contact:	Eike Stepper <stepper>
Severity:	enhancement
Priority:	P3	Keywords:	noteworthy
Version:	4.0
Target Milestone:	---
Hardware:	All
OS:	All
Whiteboard:	Power to the People
Bug Depends on:	203167
Bug Blocks:	325721

Description Eike Stepper

2010-09-22 04:00:31 EDT

Currently the fail-over management involves manual interaction with the FailoverParticipants, in particular the call to backup.setType(MASTER) after the former master has become unavailable.

We need to provide a FailoverMonitor network facility that coordinates multiple FailoverParticipants (2 or more) by communicating to a FailoverAgent per FailoverParticipant.

The FailoverMonitor is also supposed to automatically manage the connection details of the backup synchronizers and all the clients in the network, so that all nodes only need to know the FailoverMonitor connection details.

Comment 1 Eike Stepper

2010-09-22 04:08:35 EDT

New monitoring framework:

org.eclipse.emf.cdo.server.internal.net4j.syncing.FailoverMonitor
org.eclipse.emf.cdo.server.internal.net4j.syncing.FailoverAgent

Updated examples:

org.eclipse.emf.cdo.examples.server.FailoverExample.Monitored.Monitor
org.eclipse.emf.cdo.examples.server.FailoverExample.Monitored.Agent1
org.eclipse.emf.cdo.examples.server.FailoverExample.Monitored.Agent2

Committed to HEAD

Comment 2 Eike Stepper

2010-09-22 04:21:59 EDT

I've moved FailoverMonitor and FailoverAgent to the public org.eclipse.emf.cdo.server.net4jpackage because the agent is abstract and needs to be subclassed.

Comment 3 Eike Stepper

2010-09-23 03:26:14 EDT

Clients can now also participate in the monitored failover scenarios by using a new session configuration type:

	CDONet4jUtil.createFailoverSessionConfiguration(String, String, IManagedContainer)

The sessions created by this configuration will detect server/network failure (as usual) and (new) query the failover monitor for the new master connection details, connect to that master and reregister all existing views with the new master. 
	
An example is in org.eclipse.emf.cdo.examples.server.FailoverExample.Monitored.Client.main(String[])

Committed to HEAD

Comment 4 Eike Stepper

2011-06-23 03:41:25 EDT

Available in R20110608-1407