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Push Notification on Load Balanced servers
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JamesM View Drop Down
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Joined: 28-Sep-2011
Posts: 11 		Post Options Post Options   Quote JamesM Quote  Post ReplyReply Direct Link To This Post Topic: Push Notification on Load Balanced servers
    Posted: 27-Oct-2011 at 8:37am
We are using v6.0.6.0

I have a couple questions on how the BOS operates its Notification Service when the BOS resides on 2 or more servers in a load balanced configuration.

Does the BOSs share its notification subscribers automatically with other BOSs in a load balanced environment?  

Is there a way to force the BOSs to share notification subscribers if its not automatic?

For extra information: I am using a push notification that is fired from a EntityServerSaveInterceptor when a specific field on an Entity is changed when saving. 

Thank you,
James 


Edited by JamesM - 27-Oct-2011 at 8:37am
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sbelini View Drop Down
IdeaBlade
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Joined: 13-Aug-2010
Location: Oakland
Posts: 786 		Post Options Post Options   Quote sbelini Quote  Post ReplyReply Direct Link To This Post Posted: 27-Oct-2011 at 3:36pm
Hi James,

Unfortunately, in a load balanced environment BOSes do not share notification subscribers. 

DevForce's Push feature uses WCF duplex communication support where the server maintains session information for each client. This does not scale to a load balanced environment.
Our Push notification also maintains its own “server affinity” in keeping a list of subscribed clients.

We have a feature request to address this issue. 
In the meantime you could implement your custom pub-sub service using Azure Service Bus (http://msdn.microsoft.com/en-us/library/dd628757.aspx) and/or the Publish-Subscribe Framework from IDesign (http://idesign.net/idesign/DesktopDefault.aspx?tabindex=5&tabid=11).

Regards,
   Silvio.
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GeorgeB View Drop Down
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Joined: 03-May-2010
Posts: 66 		Post Options Post Options   Quote GeorgeB Quote  Post ReplyReply Direct Link To This Post Posted: 04-Nov-2011 at 4:22am
Hi Silvio
 
Currently we can't use the DevForce push notification in Azure (unless we stick to one server instance).
 
This feature request has been outstanding for a quite a while. Will we see it in the near future?
 
We bought a new DF load balancing license but without the push notification it was a waste.
 
Kr
George
 
 
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ting View Drop Down
IdeaBlade
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Joined: 27-Mar-2009
Location: San Francisco
Posts: 427 		Post Options Post Options   Quote ting Quote  Post ReplyReply Direct Link To This Post Posted: 07-Nov-2011 at 1:08pm
Hi George,

Correct, because we can't control server affinity in Azure, push notification won't work with a multi-instance Azure deployment. (However, it should be fine with other providers/deployments where you can turn on session-aware load balancing.) For this to work in Azure, we'll have to redesign push to use another mechanism, so this won't be available in the near or mid-term. Sorry for the bad news. We can credit your account if you want to remove the Data Center feature from your license.

Ting
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