Re: Support for REINDEX CONCURRENTLY

Hi,

Please find attached a new version of the patch incorporating the 2 fixes
requested:
- Fix for to insert new data to multiple toast indexes in toast_save_datum
if necessary
- Fix the lock wait phase with new function WaitForMultipleVirtualLocks
allowing to perform a wait on multiple locktags at the same time.
WaitForVirtualLocks uses also WaitForMultipleVirtualLocks but on a single
locktag.

I am still looking at the approach removing reltoastidxid, approach more
complicated but cleaner than what is currently done in the patch.

Regards,

On Tue, Feb 12, 2013 at 10:04 PM, Andres Freund <andres(at)2ndquadrant(dot)com>wrote:

> On 2013-02-12 21:54:52 +0900, Michael Paquier wrote:
> > > Changing only toast_save_datum:
> > >
> > > [... code ...]
> > >
> > Yes, I have spent a little bit of time looking at the code related to
> > retoastindxid and thought about this possibility. It would make the
> changes
> > far easier with the existing patch, it will also be necessary to update
> the
> > catalog pg_statio_all_tables to make the case where OID is InvalidOid
> > correct with this catalog.
>
> What I proposed above wouldn't need the case where toastrelidx =
> InvalidOid, so no need to worry about that.
>
> > However, I do not think it is as clean as simply
> > removing retoastindxid and have all the toast APIs running consistent
> > operations, aka using only RelationGetIndexList.
>
> Sure. This just seems easier as it really only requires changes inside
> toast_save_datum() and which mostly avoids any overhead (not even
> additional palloc()s) if there is only one index.
> That would lower the burden of proof that no performance regressions
> exist (which I guess would be during querying) and the amount of
> possibly external breakage due to removing the field...
>
> Not sure whats the best way to do this when committing. But I think you
> could incorporate something like the proposed to continue working on the
> patch. It really should only take some minutes to incorporate it.
>
> Greetings,
>
> Andres Freund
>
> --
> Andres Freund http://www.2ndQuadrant.com/
> PostgreSQL Development, 24x7 Support, Training & Services
>

--
Michael