[MUD-Dev] On Lockless Threading and X/Open XA
bruce at puremagic.com
Mon Aug 7 13:11:31 New Zealand Standard Time 2000
Greg Underwood wrote:
> My initial thought would be to have the 2PC be the commit part of the C&C.
> Any reason something that simple wouldn't work?
> It's been a while since I did an in-depth read on either protocol, but I
> don't think 2PC is necessarily anathma to a C&C approach. IIRC, what it
> buys you is the ability to rollback failed, partial commits.
I was somewhat wrong in my thinking of what phase 1 of two phase commit
was. It really is:
Phase 1: Prepare. Ask everything if it is ready and able to commit.
so, move along to phase 2. If not, immediately rollback everything.
Phase 2: Commit. Everything has said in the previous phase that it
ready and able to commit. At this point, everything can commit.
This works just fine with both C&C and some of the other schemes for
deadlock-free multithreading, since you can query in phase 1 and at that
point get an answer. The only problem that might arise then is that the
complete resolution might not be as immediate. I will remember next
time to not confuse lock acquistion with 2PC. :)
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