Starting coherence server with a ProxyService - How to add multiple members

Question

Hi,
I wonder how can we add multiple coherence instacnes to a same cluster when using the ProxyService.
I have the following in the configuration file . If we want to start another member to the cluster it fails as the port is already bound.
<proxy-scheme>
<service-name>ExtendTcpProxyService</service-name>
<thread-count>5</thread-count>
<acceptor-config>
<tcp-acceptor>
<local-address>
<address>localhost</address>
<port>9099</port>
</local-address>
</tcp-acceptor>
</acceptor-config>
<autostart>true</autostart>
</proxy-scheme>
Also, how can the client be decoupled with the coherence server address and port ?
On the client side , I have the following configuration which again restricts me to only connect to a particular host and port.
<caching-schemes>
<remote-cache-scheme>
<scheme-name>remote</scheme-name>
<service-name>ExtendTcpCacheService</service-name>
<initiator-config>
<tcp-initiator>
<remote-addresses>
<socket-address>
<address>localhost</address>
<port>9099</port>
</socket-address>
</remote-addresses>
<connect-timeout>10s</connect-timeout>
</tcp-initiator>
<outgoing-message-handler>
<request-timeout>5s</request-timeout>
</outgoing-message-handler>
</initiator-config>
</remote-cache-scheme>
<remote-invocation-scheme>
<scheme-name>extend-invocation</scheme-name>
<service-name>ExtendTcpInvocationService</service-name>
<initiator-config>
<tcp-initiator>
<remote-addresses>
<socket-address>
<address>localhost</address>
<port>9099</port>
</socket-address>
</remote-addresses>
<connect-timeout>1s</connect-timeout>
</tcp-initiator>
<outgoing-message-handler>
<request-timeout>5s</request-timeout>
</outgoing-message-handler>
</initiator-config>
</remote-invocation-scheme>
</caching-schemes>
My questions are :
1)How can the coherence server members be in cluster when using the ProxyService.
2)How can client transparently connect to any available member from the cluster.
Appreciate your help and thanks in advance.
Durga Prasad
Edited by: 904840 on Jan 19, 2012 7:30 AM

Answer 1

Hi Durga,
1)How can the coherence server members be in cluster when using the ProxyService.
The exception "port is already bound" appears because ou are trying to start another coherence server on the same machine. In this case, your proxy-scheme configuration should be different for different coherence servers running the proxies:
<tcp-acceptor>
<local-address>
<address>localhost</address>
<port>9099</port>
</local-address>
</tcp-acceptor>2)How can client transparently connect to any available member from the cluster.
Option 1: Use a hardware/software load balancer in front of your proxies and let your client configuration hold the hardware/software LB ip/port
Option 2: Implement AddressProvider interface and the details can be found here http://docs.oracle.com/cd/E18686_01/coh.37/e18678/gs_configextend.htm#BEBCACFI
Option 3: Add multiple proxies in the client configuration as below:
<tcp-initiator>
<remote-addresses>
<socket-address>
<address>localhost</address>
<port>9099</port>
</socket-address>
<socket-address>
<address>localhost</address>
<port>10000</port>
</socket-address>
</remote-addresses>
</tcp-initiator>
Hope this helps!
Cheers,
NJ
Edited by: user738616 on Jan 19, 2012 3:21 PM
Added the Option 3 to Q2 after reading the problem statement again.