Re: identify_locking_dependencies is broken for schema-only dumps

From: Robert Haas <robertmhaas(at)gmail(dot)com>
To: Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us>
Cc: "pgsql-hackers(at)postgresql(dot)org" <pgsql-hackers(at)postgresql(dot)org>
Subject: Re: identify_locking_dependencies is broken for schema-only dumps
Date: 2014-09-25 02:12:55
Message-ID: CA+TgmoYTWEEcxZK62mKM5npo2-PtGkUTSFkWG6C4dBbmY0wYKQ@mail.gmail.com
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On Wed, Sep 24, 2014 at 4:36 PM, Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us> wrote:
> Robert Haas <robertmhaas(at)gmail(dot)com> writes:
>> On Wed, Sep 24, 2014 at 12:18 PM, Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us> wrote:
>>> Sorry for not paying attention sooner. After studying it for awhile,
>>> I think the change is probably all right but your proposed comment is
>>> entirely inadequate.
>
>> If you don't like that version, can you suggest something you would like better?
>
> Perhaps like this:
>
> * We assume the entry requires exclusive lock on each TABLE or TABLE DATA
> * item listed among its dependencies. Originally all of these would have
> * been TABLE items, but repoint_table_dependencies would have repointed
> * them to the TABLE DATA items if those are present (which they might not
> * be, eg in a schema-only dump). Note that all of the entries we are
> * processing here are POST_DATA; otherwise there might be a significant
> * difference between a dependency on a table and a dependency on its
> * data, so that closer analysis would be needed here.

Works for me. I'll push with that text unless you'd like to take care of it.

--
Robert Haas
EnterpriseDB: http://www.enterprisedb.com
The Enterprise PostgreSQL Company

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