[jboss-dev-forums] [Design of JBoss Transaction Services] - Re: transaction support in JBossAS 5.0

[reverbel]

"mark.little at jboss.com" wrote : Yes, but in TP systems you never take a chance, no matter how small. Plus, I'm sure someone made a similar comment about date fields back in the 1960's and looks what happened come the year 2000! ;-)
Now your argument sounds a bit like a rhetorical one, as the year 2000 issue was an entirely different problem! ;-)

Unless you use unbounded transaction ids you will be always taking a chance, which of course should be very, very, very small. Since the XA spec places an upper limit on the size of Xids, there is no way around this in the XA design space. It is really a matter of reaching a point that is safe enough.

Half a million years at one million TPS is certainly safe enough. Note that this would not be an upper limit on the entire lifetime of the TP system, but just on the time a transaction may remain in the active state or in a heuristically completed (and not yet forgotten) state. In other words, it is just an upper limit on the time any given transaction may exist in the current set of transaction log files. Half a million years is actually way over the top for that; a few months would probably be enough.

I understand "long transactions" are becoming increasingly important, but... Do you really expect them to be that long? ;-)

Regards,

Francisco

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