On 09/02/2016 11:01 AM, Robert Haas wrote:
On Fri, Sep 2, 2016 at 8:49 AM, Andres Freund <and...@anarazel.de> wrote:
On 2016-09-02 08:31:42 +0530, Robert Haas wrote:
I wonder whether we ought to just switch from the consistent method to
the semiconsistent method and call it good.


+1. I think, before long, we're going to have to switch away from having
locks & partitions in the first place. So I don't see a problem relaxing
this. It's not like that consistency really buys you anything...  I'd
even consider not using any locks.

I think we certainly want to lock the buffer header, because otherwise
we might get a torn read of the buffer tag, which doesn't seem good.
But it's not obvious to me that there's any point in taking the lock
on the buffer mapping partition; I'm thinking that doesn't really do
anything unless we lock them all, and we all seem to agree that's
going too far.

+1 from me to only locking the buffer headers. IMHO that's perfectly fine for the purpose of this extension.

regards

--
Tomas Vondra                  http://www.2ndQuadrant.com
PostgreSQL Development, 24x7 Support, Remote DBA, Training & Services


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