On 2 November 2015 at 13:24, Konstantin Knizhnik <k.knizh...@postgrespro.ru> wrote:
> PostgreSQL assumes that top-level xid commit is atomic, along with all of > its subtransactions. So the API having access to only Get/Set at the xid > level would not work. We would need TransactionIdSetTreeStatus() rather > than just SetStatus. GetStatus is not atomic. > > > XTM API has function SetTransactionStatus but it actually encapsulate > TransactionIdSetTreeStatus. > OK, thanks. > At present, I can't tell whether you need subtrans and multixact calls in > the API as well. I would imagine we probably do, though we might imagine an > implementation that didn't support those concepts. > > > Postgres-XL doesn't support subtransactions. Neither did we at this moment. > Support of subtransactions will be our next step. > OK. I guess it depends where we want to put the patch; discussion here means in-core, so for it to go in here, we do need subxacts etc. -- Simon Riggs http://www.2ndQuadrant.com/ <http://www.2ndquadrant.com/> PostgreSQL Development, 24x7 Support, Remote DBA, Training & Services
