IceGrid and load balancing

[Matthieu]

I try to run an IceGrid application with load balancing...

That's why I did two servers (in java) which have a single object (affpoint).

The two servers are located in two differents directory, are called both "Serverpoint.class"; I create the directory db, db/Registry, db/Node1, db/node3 for icegrid service.

I put in my XML file :
- a replica-group
<replica-group id="Raffpoint">
<load-balancing type="adaptive" load-sample="5" n-replicas="2"/>
<object identity="affpoint" type=":emo::Caracteristique"/>
</replica-group>

- a server template
<server-template id="affpointTemplate">
<parameter name="index"/>
<parameter name="exepath" default="java"/>
<server id="AffpointServer${index}" exe="${exepath}" activation="on-demand">
<option>Serverpoint</option>
<property name="Ice.MessageSizeMax" value="1000000000"/>
<adapter name="Aaffpoint" endpoints="tcp" register-process="true" replica-group="Raffpoint"/>
</server>
</server-template>

- two nodes with the two server-instances
<node name="Node1">
<server-instance template="affpointTemplate" index="2"/>
</node>

<node name="node3">
<server-instance template="affpointTemplate" index="1"/>
</node>

I associate the XML file to the IceGrid service with :
icegridadmin --Ice.Config=IceGrid\config.grid -e "application add ..\application_load_bal.xml"

I run the two servers with :
icegridnode --Ice.Config=config.host1
icegridnode --Ice.Config=config.host2


When I try to use the object affpoint with a client, the server on node3 answer and execute the request. If I shut down this server, the object is no more available, even if the server on node1 is running...

Other questions : are the server-template absolutely necessary in order to do load-balancing ?

Thank you for your help !
Matthieu

[benoit]

Hi Matthieu,

Are you sure the node name from the XML descriptor matches the one in the icegridnode configuration file? For instance, do you use "node1" or "Node1" (as specified in the XML) in the configuration file of the IceGrid node?

If you don't want to use server templates you can just use server descriptors in the XML deployment descriptors (<server> XML element). Or are you asking if it's possible to use replica groups without XML descriptors? That's also possible when using dynamic registration but it's more limited (only random load balancing is possible). See Michi's article for more information on dynamic registration here: Teach Yourself IceGrid in 10 Minutes or here in the Ice manual.

Cheers,
Benoit.

[Matthieu]

Right !!
It was a problem with the node name... Thank you, it works now !

Thank you for the articles !

About my question : it is possible to do load-balancing beetween objects without define them in <server-instance> configured by <serveur-template> ?

Cheers,
Matthieu