| From: | Alvaro Herrera <alvherre(at)2ndquadrant(dot)com> |
|---|---|
| To: | Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us> |
| Cc: | Oleg Bartunov <oleg(at)sai(dot)msu(dot)su>, Teodor Sigaev <teodor(at)sigaev(dot)ru>, pgsql-hackers(at)postgreSQL(dot)org, hailong(dot)li(at)qunar(dot)com |
| Subject: | Re: SPGist "triple parity" concept doesn't work |
| Date: | 2013-06-07 17:11:41 |
| Message-ID: | 20130607171141.GF4407@eldon.alvh.no-ip.org |
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| Lists: | pgsql-hackers |
Tom Lane wrote:
> I don't immediately see any good way to fix this. I think the "triple
> parity" rule as it stands is hopelessly broken, but I don't know what
> to replace it with, even granting that we don't need to maintain on-disk
> compatibility. (We'd have to tell people to reindex SPGist indexes
> anyway, because of the risk that they already contain circular links;
> so switching to a new layout rule doesn't seem to add any more pain.)
> Or we could try to modify the insertion algorithm so it doesn't lock
> two levels of the tree at once, but that seems pretty risky.
Is this the chance to add a metapage?
--
Álvaro Herrera http://www.2ndQuadrant.com/
PostgreSQL Development, 24x7 Support, Training & Services
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