Hi Dobri,
I'm not an Kandula 2 expert, but I feel your questions are not product specific but rather general WS-Transaction related, so I'll give it a shot.
1) What will happen if a WS goes down during the 2PC of the WS TX? What about if it has succeeded to vote prepared?
A WS that reported "prepared" should already have the information about the transaction stored reliably, so that it may resume its participation once it comes up again. The coordinator of the atomic transaction will repeatedly try to transmit the final "commit" notification to this participant until it succeeds (or some configured timeout stops them).
Or rollback will be invoked after the WS Transaction?
This is impossible - the coordinator notifies all participants at the same moment of the "commit". Even if some participants cannot be immediately reached, the coordinator cannot redecide since the participants that were reachable already have permanently committed and left the transaction.
2) Another interesting scenario is when we have the Coordinator service down during a WS TX? What will happen then? Let's say we have 2 WS. The WS1 succeeded to commit but just before to invoke "Commit" to WS2 AtomicTransactionCoordinator fails. What will happen with the WS TX?
Before sending out commit/rollback notifications the coordinator also will reliably store its transaction result. As soon it comes up again, it will resume its operation and notify the other participants.
If it doesn't come up again, then yes, there is a problem: the transaction on WS2 will hang forever, and also the user doesn't get a confirmation back.
I will make some tests when i find some time top do so and then will post the results.
As far as I know neither Kandula_1 nor Kandula_2 reliably store transaction metadata away, so if they go down they forget about all running transactions. This is definitely something to improve ;-)
-hannes --------------------------------------------------------------------- To unsubscribe, e-mail: [EMAIL PROTECTED] For additional commands, e-mail: [EMAIL PROTECTED]
