"Kevin Grittner" <kevin.gritt...@wicourts.gov> writes:
> Dan Ports <d...@csail.mit.edu> wrote:
>> the sxact's lastCommitBeforeSnapshot needs to match the snapshot,
>> SxactGlobalXmin needs to be set to the correct value, etc. That's
>> why the call to GetSnapshotData happens from where it does
> Oh, right. I knew I was forgetting something. What if that was
> captured as part of building a snapshot? That seems like it would
> be a trivial cost compared to other snapshot-building activity, and
> might give us a way to get this out from under the
> SerializableXactHashLock locking.
But aren't the values you need to fetch protected by
SerializableXactHashLock? Having to take an additional LWLock is
*not* a "trivial cost".
regards, tom lane
--
Sent via pgsql-hackers mailing list (pgsql-hackers@postgresql.org)
To make changes to your subscription:
http://www.postgresql.org/mailpref/pgsql-hackers
