Re: Avoiding pin scan during btree vacuum - Mailing list pgsql-hackers

From Tom Lane
Subject Re: Avoiding pin scan during btree vacuum
Date
Msg-id 12376.1451921428@sss.pgh.pa.us
Whole thread Raw
In response to Re: Avoiding pin scan during btree vacuum  (Andres Freund <andres@anarazel.de>)
Responses Re: Avoiding pin scan during btree vacuum  (Robert Haas <robertmhaas@gmail.com>)
List pgsql-hackers
Andres Freund <andres@anarazel.de> writes:
> On 2016-01-03 15:40:01 +0000, Simon Riggs wrote:
>> I'm happy with this being a simple patch now, not least because I would
>> like to backpatch this to 9.4 where catalog scans became MVCC.
>> 
>> A backpatch is warranted because it is a severe performance issue with
>> replication and we can fix that before 9.5 hits the streets.
>> 
>> I'll be doing some more testing and checking, so not in a rush.

> This seems like a might subtle thing to backpatch. If we really want to
> go there, ISTM that the relevant code should stew in an unreleased
> branch for a while, before being backpatched.

I'm definitely -1 on back-patching such a thing.  Put it in HEAD for
awhile.  If it survives six months or so then we could discuss it again.
        regards, tom lane



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