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From Dennis van der Laan <d.g.van.der.l...@rug.nl>
Subject Re: Performance question when clustering
Date Tue, 20 Apr 2010 09:53:05 GMT
Thomas, others,
> The automatic sync is periodic (once every few seconds).
> Session.refresh() will force an immediate cluster sync. I'm not sure
> if the immediate cluster sync on Session.refresh() is a good idea, but
> that's how it's implemented currently.
Okay, I agree the choice to do a full cluster sync for every
Session.refresh() can be a poor one in some situations. But I guess
someone would like to avoid having to call ClusterNode.sync() from
custom code if needed, because of code-dependency on a clustered
configuration. A trade-off. But from your reply I may conclude the
automatic sync and the manual Session.refresh() have essentially the
same result?
>> - Why is a refresh more expansive when there are more cluster nodes?
> This I don't know.
I meant 'expensive' and not 'expansive' :) But I guess you guessed that.
Should this be something you should know? Is it strange behavior? Or
might somebody else know why we see this effect?



Dennis van der Laan, MSc
Centre for Information Technology
University of Groningen

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