| From: | Dilip Kumar <dilipbalaut(at)gmail(dot)com> |
|---|---|
| To: | Thomas Munro <thomas(dot)munro(at)gmail(dot)com> |
| Cc: | Robert Haas <robertmhaas(at)gmail(dot)com>, Amit Kapila <amit(dot)kapila16(at)gmail(dot)com>, Andres Freund <andres(at)anarazel(dot)de>, Dmitry Dolgov <9erthalion6(at)gmail(dot)com>, Kuntal Ghosh <kuntalghosh(dot)2007(at)gmail(dot)com>, Pg Hackers <pgsql-hackers(at)postgresql(dot)org> |
| Subject: | Re: POC: Cleaning up orphaned files using undo logs |
| Date: | 2019-07-17 05:26:30 |
| Message-ID: | CAFiTN-uLJSicU5XT0nTqSDJic5-Y6ToPfA0JnC9XHEFg8St9zg@mail.gmail.com |
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On Wed, Jul 17, 2019 at 9:27 AM Thomas Munro <thomas(dot)munro(at)gmail(dot)com> wrote:
>
> On Wed, Jul 17, 2019 at 3:44 PM Dilip Kumar <dilipbalaut(at)gmail(dot)com> wrote:
> > Right, actually I got that point. But, I was thinking that we are
> > wasting one logno from undo log addressing space no?. Instead, if we
> > can keep it attached to the slot and somehow manage to add to the free
> > list then the same logno can be used by someone else?
>
> We can never reuse log numbers. UndoRecPtr values containing that log
> number could exist in permanent storage anywhere (zheap, zedstore etc)
> and must appear to be discarded forever if anyone asks.
Yeah right. I knew that we can not reuse UndoRecPtr but forget to
think that if we reuse logno then it is same as reusing UndoRecPtr.
Sorry for the noise.
--
Regards,
Dilip Kumar
EnterpriseDB: http://www.enterprisedb.com
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