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Cache coordination [message #661575] Fri, 25 March 2011 13:15 Go to next message
J F is currently offline J FFriend
Messages: 256
Registered: July 2009
Senior Member
Does cache coordination across processes/servers only happen once a Transaction has committed?
Is there anyway to have the cache be available to another process/server which is running within the same Transaction or should I flush the changes to the database before crossing a process/server boundary?

Thanks.

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Re: Cache coordination [message #661955 is a reply to message #661575] Mon, 28 March 2011 15:19 Go to previous messageGo to next message
James Sutherland is currently offline James SutherlandFriend
Messages: 1939
Registered: July 2009
Location: Ottawa, Canada
Senior Member
Yes, the cache is only coordinated when the transaction is committed.

In general, avoiding transactions that span multiple different servers is a good idea. I'm not even sure how you would get into this situation. You could flush the changes on one machines a refresh them on the other to see the changes.

James : Wiki : Book : Blog : Twitter

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Re: Cache coordination [message #661966 is a reply to message #661955] Mon, 28 March 2011 16:20 Go to previous message
J F is currently offline J FFriend
Messages: 256
Registered: July 2009
Senior Member
Thanks,

I suppose Application Clusters must ensure that it never happens, otherwise you would see it quite frequently.

Suppose a thread X begins using EAR 'A' on one machine 'A' and then calls into a different EAR 'B' on another box 'B' ( because of say, load balancing or because of some 'scarce' network resource that is only available on certain nodes ) and then that thread in turn calls back into a different component of EAR 'A', the AppServer must pick up the fact that this is re-entrancy and continue in the context of the original thread X on machine 'A'.

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