Serializable lock consistency (was Re: CommitFest wrap-up)

On 15.12.2010 16:20, Florian Pflug wrote:
> On Dec14, 2010, at 15:01 , Robert Haas wrote:
>> On Tue, Dec 14, 2010 at 7:51 AM, Florian Pflug<fgp(at)phlo(dot)org> wrote:
>>>> - serializable lock consistency - I am fairly certain this needs
>>>> rebasing. I don't have time to deal with it right away. That sucks,
>>>> because I think this is a really important change.
>>> I can try to find some time to update the patch if it suffers from bit-rot. Would that help?
>>
>> Yes!
>
> I've rebased the patch to the current HEAD, and re-run my FK concurrency test suite,
> available from https://github.com/fgp/fk_concurrency, to verify that things still work.
>
> I've also asserts to the callers of heap_{update,delete,lock_tuple} to verify (and document)
> that update_xmax may only be InvalidTransactionId if a lockcheck_snapshot is passed to
> heap_{update,delete,lock_tuple}.
>
> Finally, I've improved the explanation in src/backend/executor/README of how row locks and
> REPEATABLE READ transactions interact, and tried to state the guarantees provided by
> FOR SHARE and FOR UPDATE locks more precisely.
>
> I've published my work to https://github.com/fgp/postgres/tree/serializable_lock_consistency,
> and attached an updated patch. I'd be happy to give write access to that GIT repository
> to anyone who wants to help getting this committed.

Here's some typo & style fixes for that, also available at
git://git.postgresql.org/git/users/heikki/postgres.git.

--
Heikki Linnakangas
EnterpriseDB http://www.enterprisedb.com