I'd like to know what people think about weblocks opening a transaction
for every request.

I've just hit a problem, as I have a transaction that I know will
sometimes fail and can be safely retried (see my blog post
http://jan.rychter.com/enblog/2009/6/6/postgresql-transactions.html for
details). Unfortunately, as weblocks encloses every request in a giant
transaction, my transaction has no effect, as they can't be nested. And
I'd venture a guess that just retrying the whole-request-transaction is
a bad idea, as there are plenty of side effects all over the code,
rendering being one of them.

Do we need more fine-grained transaction control?

How many things in Weblocks assume the enclosing transaction is there?

Ideas?

--J.

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