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From Donald Woods <>
Subject Re: configure RemoteCommitProvider for Amazon EC2
Date Mon, 17 May 2010 21:09:20 GMT

On 5/17/10 5:20 AM, Oliver Krohne wrote:
> Hi,
> we are going to deploy our app to Amazon EC2.
> One issue is that the ip-adresses of an ec instance can change and new ec instances
> can be started which makes the RemoteCommitProvider using TCP unuseable as all
> TCP adresses where messages are sent to must be configured at the point the 
> instance is starting. New instances can't be added without reconfiguring the running
ec instances.

What about the Amazon Simple Queue Service (SQS)?

> Using JMS as transport would work but i don't want a another machine running and hence
a new point of failure.
> But I would be thankful for any experience using JMS (openjms or activemq?).

I've only used ActiveMQ as a JMS provider in Apache Geronimo, but it
does have robust discovery and fail-over mechanisms.

> So am thinking of using jgroups were new instances can join a channel, but I did not
found someone 
> who has implemented it, maybe in this mailinglist?
> The other solution would be using ehcache with jgroups replication and 
> just replicate "removes and updates". Does anyone have experience with this setup?

To use ehcache, you'd need to create a EhcaheRemoteCommitProvider that
can instantiate a CacheManager and Cache based on a XML configuration
file.  I've opened OPENJPA-1669 and started looking at creating one for
trunk :-)


> Thanks,
> Oliver

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