On Wed, 21 Jan 2009, Bruce Momjian wrote:
Josh Berkus wrote:
Bruce,
Plugability adds complexity. Heikki's comment is that adding this patch
make the job of creating pluggable indexes 5% easier, while no one is
actually working on plugable indexes, and it hard to say that making it
5% easier really advances anything, especially since many of our
existing index types aren't WAL-logged. Plugability is not a zero-cost
feature.
Right. And I'm saying that pluggability is PostgreSQL's main reason for
existence, if you look at our place in the future of databases. So it's
worth paying *some* cost, provided that the cost/benefit ratio works for
the particular patch.
To rephrase: I can't judge the rmgr patch one way or the other. I'm
only objecting to the idea expressed by Heikki and others that pluggable
indexes are stupid and unnecessary.
It is cost vs. benefit. No one is saying plugabiity is bad, only that
in this case it is more costly than beneficial; of course, that might
change some day.
as I understand, there are already plans to utilize this feature. If so,
we need to be more attentive by now.
Regards,
Oleg
_____________________________________________________________
Oleg Bartunov, Research Scientist, Head of AstroNet (www.astronet.ru),
Sternberg Astronomical Institute, Moscow University, Russia
Internet: o...@sai.msu.su, http://www.sai.msu.su/~megera/
phone: +007(495)939-16-83, +007(495)939-23-83
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