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Re: parallel pg_restore - WIP patch

From: Andrew Dunstan <andrew(at)dunslane(dot)net>
To: Dimitri Fontaine <dfontaine(at)hi-media(dot)com>
Cc: pgsql-hackers(at)postgresql(dot)org, Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us>, Stefan Kaltenbrunner <stefan(at)kaltenbrunner(dot)cc>, Russell Smith <mr-russ(at)pws(dot)com(dot)au>, Jeffrey Baker <jwbaker(at)gmail(dot)com>
Subject: Re: parallel pg_restore - WIP patch
Date: 2008-09-29 14:25:10
Message-ID: (view raw, whole thread or download thread mbox)
Lists: pgsql-hackers

Dimitri Fontaine wrote:
> Le lundi 29 septembre 2008, Tom Lane a écrit :
>> * Extend the archive format to provide some indication that "restoring
>> this object requires exclusive access to these dependencies".
>> * Hardwire knowledge into pg_restore that certain types of objects
>> require exclusive access to their dependencies.
> Well, it seems to me that currently the FK needs in term of existing indexes 
> and locks, and some other object lock needs, are all hardwired. Is it even 
> safe to consider having the locks needed for certain commands not be 
> hardwired?
> Provided I'm not all wrong here, I don't see how having something more 
> flexible at restore time than at build time is a win. The drawback is that 
> whenever you change a lock need in commands, you have to remember teaching 
> pg_restore about it too.
> So my vote here is in favor of hardwired knowledge of pg_restore, matching 
> target server code assumptions and needs.

Well, I've had to use some knowledge of various item types already, and 
I have been trying not to disturb pg_dump also, so I'm inclined to build 
this knowledge into pg_restore.

ISTM that "things that will have lock conflicts" are different and more 
target version dependent than "things that logically depend on other 
things", so we can still rely on pg_dump to some extent to provide the 
latter while building the former at restore time.



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