| From: | Robert Haas <robertmhaas(at)gmail(dot)com> |
|---|---|
| To: | Craig Ringer <craig(at)2ndquadrant(dot)com> |
| Cc: | Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us>, "pgsql-hackers(at)postgresql(dot)org" <pgsql-hackers(at)postgresql(dot)org> |
| Subject: | Re: Re: [COMMITTERS] pgsql: Introduce group locking to prevent parallel processes from deadl |
| Date: | 2016-02-17 04:12:46 |
| Message-ID: | CA+Tgmob5aM=txM13KgdGcVU+aY1O+r24fPGOaj4wWLZBetLbog@mail.gmail.com |
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On Tue, Feb 16, 2016 at 8:37 PM, Craig Ringer <craig(at)2ndquadrant(dot)com> wrote:
> On 14 February 2016 at 08:05, Robert Haas <robertmhaas(at)gmail(dot)com> wrote:
>> The concept of a
>> lock group is formally separate from the concept of a parallel group
>> created by a ParallelContext, but it is not clear that there will ever
>> be any other context in which a lock group will be a good idea.
>
> Just coming back to this in terms of what Stephen and I raised: Robert, do
> you think this design as it stands can handle cases where a normal
> standalone backend gets promoted to a lock-group leader that others can then
> join?
That's the exact intended purpose of it.
--
Robert Haas
EnterpriseDB: http://www.enterprisedb.com
The Enterprise PostgreSQL Company
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