So I went as far as the following:
- compare the configuration: they only differ in the hostnames as expetd
- compare the output of the JMX JGroups' attribute-values with a diff tool. A 
few numbers are different... but I do not think that this is important.

I then finally activated debug using logback.xml and reproduced the very simple:
- create doc Sandbox.A on node 1
- verify it is visible in node 2
- edit it there (e.g. adding a letter in the title), save
- fail to see the changed title in node 1
As I indicated by the "dissymetric" subject of the mail: in our two pairs of 
clustered servers, this only happens when node 1 and node 2 are very precise 
machines and it does not happen if you exchange machine 1 and machine 2.

In the log I saw that the message was received but, apparently, something 
prevented that arrival from actually happening.

What could prevent this arrival to propagate?

thanks in adnvance




Le 18 sept. 2012 à 19:30, Joshua Marks a écrit :
> Also any input on how to debug is greatly appreciated. 


> -----Original Message-----
> Paul Libbrecht
> To: XWiki Developers
> Subject: [xwiki-devs] dyssmetric cluster... what's up?
> 
> 
> Hello devs,
> 
> we are having a very very weird bug: the two nodes of our cluster are made
> of A and B and saved objects sync into B when written on A but fail to do
> sync into A when written on B.
> 
> What could be the cause?
> 
> thanks in advance

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