Temporarily disable caching

Hello,
I would like to be able to update an application to a newer version without any interruption of service by sequentially updating every machine in the cluster while the others are running.
There will be in consequence a small period of time during the update in which different application versions will be running on different servers. Different domain object versions may clash inside the Coherence cache.
In order to tackle this problem I am considering temporarily reducing the size of our caches to 0 (i.e. temporarily "disabling" cache). When all the servers are updated to the newer version, cache would be reactivated.
My question is: how can I do that at runtime, without changing configuration files and restarting Coherence, using just the Coherence console?
Otherwise, anybody has any experience to share on hot updating with distributed cache ?
I am using Coherence 3.0.
Thank you,
Adrian Dimulescu

Adrian,
First, I'd like to underscore that the Coherence command line console is a tool for developers, not the operational people. It requires deep understanding of your caching layer topology and a small mistake or typo can result in an application failure. Majority of commercial deployments I've seen contain a dedicated application control and management tier developed by application developers for operational use at deployment time.
Secondly, I don't know whether or not your application uses a read-through caching approach or a read-aside, but in either case let's assume that immediately after you clear the cache a user thread checks the cache for some data and immediately turns around and puts new data into the cache. You would end up with an "old" version of data, which is what you want to avoid. To prevent this from happening you need to have some synchronization logic or flags that indicate the fact the application is currently in transition. That could only be a part of application logic I was talking about.
All said, I may not see all the complexity around your specific upgrade process, so the decision is yours to make...
Regards,
Gene

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