| [CDO] High Available CDO servers [message #1775672] |
Fri, 03 November 2017 01:58  |
Eclipse User |
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Hi there,
Eike stated at Eclipsecon that CDO supports some mechanism like Server synchronisation (Master/Slave or Cluster?) to support high availability for CDO servers.
I didn't find any information about the features nor how to set it up in the CDO docs. Can someone point me somewhere?
Cheers,
Hauke
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| Re: [CDO] High Available CDO servers [message #1775781 is a reply to message #1775672] |
Mon, 06 November 2017 04:54  |
| Eclipse User |
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Hi Hauke,
Five years ago I blogged about these two examples:
http://thegordian.blogspot.de/2012/11/use-online-data-offline.html
http://thegordian.blogspot.de/2012/11/fail-server-fail.html
They both refer to screencasts that might be interesting for you.
Unfortunately the example doesn't seem to run anymore. One problem is easy to fix in the SynchronizableRepository.notifyWriteAccessHandlers() method. It should be like this:
public void notifyWriteAccessHandlers(ITransaction transaction, CommitContext commitContext, boolean beforeCommit, OMMonitor monitor)
{
if (beforeCommit && commitContext.getNewPackageUnits().length != 0)
{
for (InternalCDOPackageUnit packageUnit : commitContext.getNewPackageUnits())
{
if (!packageUnit.isSystem())
{
throw new IllegalStateException(
"Synchronizable repositories don't support dynamic addition of new packages. Use IRepository.setInitialPackages() instead.");
}
}
}
super.notifyWriteAccessHandlers(transaction, commitContext, beforeCommit, monitor);
}
The problem that comes up next seems to be in the example UI, but I currently don't have the time to investigate it. Maybe you have an idea ;-)
Cheers
Eike
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