| From: | Noah Misch <noah(at)leadboat(dot)com> |
|---|---|
| To: | Simon Riggs <simon(at)2ndQuadrant(dot)com> |
| Cc: | PostgreSQL-development <pgsql-hackers(at)postgresql(dot)org> |
| Subject: | Re: Parallel Sort |
| Date: | 2013-05-14 14:35:01 |
| Message-ID: | 20130514143501.GA223910@tornado.leadboat.com |
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| Lists: | pgsql-hackers |
On Mon, May 13, 2013 at 07:55:16PM +0100, Simon Riggs wrote:
> On 13 May 2013 15:28, Noah Misch <noah(at)leadboat(dot)com> wrote:
>
> > The heavyweight locking mechanism will need to be aware of the association
> > between the master and its workers.
>
> Not sure I can see why that would be true.
>
> ISTM that the workers need to be restricted in various ways from a
> full-functioned master. If the workers can do things that conflict
> with the master and/or each other, we're going to have all kinds of
> hurt.
>
> The key is going to be deciding what the restrictions are and then
> working out how to enforce them.
Yes, specific lock manager needs will depend on what we permit workers to do.
--
Noah Misch
EnterpriseDB http://www.enterprisedb.com
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