如何在j2ee中实现Long运行的分布式事务

Question

I want to move records from one database to another which are on different machines. the records should be removed from first database and inserted to second database atomically.

can we use xa ? i believe xa uses 2 phase commit algorithm which requires the blocking locks on the resources

the target database is a EIS database, so it should be locked for minimum time.

Answer 1

XA is indeed a 2 phase commit blocking protocol, but in my case there are only two entities involed with the first entity being very fast. so 2PC will work efficiently for me.

for a more general scenario 3 phase commit can be used. it's a non-blocking protocol. though dont' seems to have any java specifications.

also came across BTP and http://jotm.objectweb.org/jotm-btp.html not sure how easily it can fused with JDBC adapter.

Answer 2

XA doesn't have any incidence on the locking mechanism. It just makes sure that ACIDity is preserved even if you update two separate transactional resources. Your usecase only updates one, if I understand correctly, so XA is not necessary here.