From: | Simon Riggs <simon(at)2ndQuadrant(dot)com> |
---|---|
To: | Andres Freund <andres(at)2ndquadrant(dot)com> |
Cc: | Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us>, Michael Paquier <michael(dot)paquier(at)gmail(dot)com>, "pgsql-hackers(at)postgresql(dot)org" <pgsql-hackers(at)postgresql(dot)org> |
Subject: | Re: Support for REINDEX CONCURRENTLY |
Date: | 2012-12-07 18:17:48 |
Message-ID: | CA+U5nMJN24rKcM8TtyoH_pt8XREhEPQCYYya6DQoa10=utE0vQ@mail.gmail.com |
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Lists: | pgsql-hackers |
On 7 December 2012 17:19, Andres Freund <andres(at)2ndquadrant(dot)com> wrote:
> On 2012-12-07 12:01:52 -0500, Tom Lane wrote:
>> Simon Riggs <simon(at)2ndQuadrant(dot)com> writes:
>> > On 7 December 2012 12:37, Michael Paquier <michael(dot)paquier(at)gmail(dot)com> wrote:
>> >> - There is still a problem with toast indexes. If the concurrent reindex of
>> >> a toast index fails for a reason or another, pg_relation will finish with
>> >> invalid toast index entries. I am still wondering about how to clean up
>> >> that. Any ideas?
>>
>> > Build another toast index, rather than reindexing the existing one,
>> > then just use the new oid.
>
> Thats easier said than done in the first place. toast_save_datum()
> explicitly opens/modifies the one index it needs and updates it.
Well, yeh, I know what I'm saying: it would need to maintain 2 indexes
for a while.
The point is to use the same trick we do manually now, which works
fine for normal indexes and can be made to work for toast indexes
also.
>> Um, I don't think you can swap in a new toast index OID without taking
>> exclusive lock on the parent table at some point.
>
> The whole swapping issue isn't solved satisfyingly as whole yet :(.
>
> If we just swap the index relfilenodes in the pg_index entries itself,
> we wouldn't need to modify the main table's pg_class at all.
yes
--
Simon Riggs http://www.2ndQuadrant.com/
PostgreSQL Development, 24x7 Support, Training & Services
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