Tom Lane writes: > No. The real problem with 2PC in my mind is that its failure modes > occur *after* you have promised commit to one or more parties. In > multi-master, if you fail you know it before you have told the client > his data is committed.
I have a book here which claims that the solution to the problems of 2-phase commit is 3-phase commit, which goes something like this: coordinator participant ----------- ----------- INITIAL INITIAL prepare --> WAIT <-- vote commit READY (all voted commit) prepare-to-commit --> PRE-COMMIT <-- ready-to-commit PRE-COMMIT global-commit --> COMMIT COMMIT If the coordinator fails and all participants are in state READY, they can safely decide to abort after some timeout. If some participant is already in state PRE-COMMIT, it becomes the new coordinator and sends the global-commit message. Details are left as an exercise. :-) -- Peter Eisentraut [EMAIL PROTECTED] ---------------------------(end of broadcast)--------------------------- TIP 9: the planner will ignore your desire to choose an index scan if your joining column's datatypes do not match