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CDO failover configuration [message #740167]

Tue, 18 October 2011 08:22

Dmitry

Messages: 3
Registered: October 2011

Junior Member

Hi everybody.
I want to raise two CDO servers in failover configuration. Where can I find any instructions on that? Google doesn't know...

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Re: CDO failover configuration [message #740176 is a reply to message #740167]

Tue, 18 October 2011 08:29

Eike Stepper

Messages: 6682
Registered: July 2009

Senior Member

Am 18.10.2011 10:22, schrieb Dmitry:
> Hi everybody. I want to raise two CDO servers in failover configuration. Where can I find any instructions on that?
> Google doesn't know...
There's a standalone example for monitored fail-over clusters in the org.eclipse.emf.cdo.examples plugin.
Please have a look at org.eclipse.emf.cdo.examples.server.FailoverExample.Monitored

Does that help?

Cheers
/Eike

----
http://www.esc-net.de
http://thegordian.blogspot.com
http://twitter.com/eikestepper

Cheers
/Eike

----
http://www.esc-net.de
http://thegordian.blogspot.com
http://twitter.com/eikestepper

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Re: CDO failover configuration [message #1782664 is a reply to message #740176]

Tue, 27 February 2018 13:27

Pavel Vlasov

Messages: 23
Registered: December 2015

Junior Member

Hello,

In Oxygen CDO SDK there is "org.eclipse.emf.cdo.examples.clone" and "org.eclipse.emf.cdo.examples.master". There is no reference to fail-over in these projects. I've found the fail-over example on GitHub - https://github.com/eclipse/cdo/tree/master/plugins/org.eclipse.emf.cdo.examples/src/org/eclipse/emf/cdo/examples/server.

Can you please let me know:
- Is the fail-over approach still viable? Online references which I found date back to circa 2011, including the previous post in this topic.
- Where can I find instructions how to set-up a fail-over server, similar to the "CDO Server Operator's guide"?
- Is the example still working?
- How mature is the fail-over feature? I.e. would it justify the effort investment to set it up to survive individual server patching/restart or it'd be easier just to live with several minutes of unavailability per month?
---
Thank you, Pavel.

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Re: CDO failover configuration [message #1796050 is a reply to message #1782664]

Thu, 04 October 2018 12:58

Robert Schulk

Messages: 144
Registered: July 2015

Senior Member

Hi, I would also like to know this. The feature sounds great, but I am not sure if we should implement it.

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Re: CDO failover configuration [message #1796775 is a reply to message #1796050]

Thu, 18 October 2018 17:47

Eike Stepper

Messages: 6682
Registered: July 2009

Senior Member

Hi,

Fail-over requires branching; and branching requires auditing; and auditing means that the database never shrinks. Fail-over is a quite expensive feature if you don't need auditing for other reasons, anyway.

Apart from that, fail-over scenarios are currently not in our automated tests, nor is fail-over deployed in many real-live environments (I think). It used to be mature, but I can currently make no guarantees. Please let me know if you want me to investigate deeper or fix problems...

Cheers
/Eike

----
http://www.esc-net.de
http://thegordian.blogspot.com
http://twitter.com/eikestepper

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