| From: | Michael Paquier <michael(dot)paquier(at)gmail(dot)com> |
|---|---|
| To: | Alvaro Herrera <alvherre(at)2ndquadrant(dot)com> |
| Cc: | Jesper Pedersen <jesper(dot)pedersen(at)redhat(dot)com>, Stas Kelvich <s(dot)kelvich(at)postgrespro(dot)ru>, PostgreSQL mailing lists <pgsql-hackers(at)postgresql(dot)org>, Robert Haas <robertmhaas(at)gmail(dot)com>, Simon Riggs <simon(at)2ndquadrant(dot)com> |
| Subject: | Re: Speedup twophase transactions |
| Date: | 2016-05-20 17:08:23 |
| Message-ID: | CAB7nPqSZiFOkwjmG-jKR428fxm9o-ZHU32di5qCzM315jfFvuQ@mail.gmail.com |
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| Lists: | pgsql-hackers |
On Fri, May 20, 2016 at 12:46 PM, Alvaro Herrera
<alvherre(at)2ndquadrant(dot)com> wrote:
> Jesper Pedersen wrote:
>> Discussed with Noah off-list I think we should revisit this for 9.6 due to
>> the async replica lag as shown in [1]. The performance improvement for the
>> master node is shown in [2].
>
> I gave a very quick look and it seems to me far more invasive than we
> would normally consider in the beta period. I would just put it to
> sleep till release 10 opens up.
I share the same opinion. Improving 2PC is definitely a huge win
thanks to the first patch that got committed when WAL is generated,
but considering how the second patch is invasive really concerns me,
and I looked at the patch in an extended way a couple of weeks back.
As we care about stability now regarding 9.6, let's bump the second
portion to 10.0 as well as keep the improvement for WAL generation in
9.6.
--
Michael
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