Re: Inconsistency in determining the timestamp of the db statfile. - Mailing list pgsql-hackers

From Fujii Masao
Subject Re: Inconsistency in determining the timestamp of the db statfile.
Date
Msg-id 31324783-7380-f77e-0b60-185a28e235bb@oss.nttdata.com
Whole thread Raw
In response to Re: Inconsistency in determining the timestamp of the db statfile.  (Magnus Hagander <magnus@hagander.net>)
Responses Re: Inconsistency in determining the timestamp of the db statfile.  (Amit Kapila <amit.kapila16@gmail.com>)
List pgsql-hackers

On 2020/09/09 22:57, Magnus Hagander wrote:
> On Wed, Sep 9, 2020 at 3:56 PM Tomas Vondra <tomas.vondra@2ndquadrant.com <mailto:tomas.vondra@2ndquadrant.com>>
wrote:
> 
>     On Wed, Sep 09, 2020 at 03:53:40PM +0530, Amit Kapila wrote:
>      >On Wed, Sep 9, 2020 at 3:15 PM Magnus Hagander <magnus@hagander.net <mailto:magnus@hagander.net>> wrote:
>      >>
>      >> On Wed, Sep 9, 2020 at 5:04 AM Amit Kapila <amit.kapila16@gmail.com <mailto:amit.kapila16@gmail.com>> wrote:
>      >>>
>      >>
>      >> Though in fact the one inconsistent place in the code now is that if it is corrupt in the db entry part of
thefile it returns true and the global timestamp, which I would argue is perhaps incorrect and it should return false.
 
>      >>
>      >
>      >Yeah, this is exactly the case I was pointing out where we return true
>      >before the patch, basically the code below:
>      >case 'D':
>      >if (fread(&dbentry, 1, offsetof(PgStat_StatDBEntry, tables),
>      >  fpin) != offsetof(PgStat_StatDBEntry, tables))
>      >{
>      >ereport(pgStatRunningInCollector ? LOG : WARNING,
>      >(errmsg("corrupted statistics file \"%s\"",
>      >statfile)));
>      >goto done;
>      >}
>      >
>      >done:
>      >FreeFile(fpin);
>      >return true;
>      >
>      >Now, if we decide to return 'false' here, then surely there is no
>      >argument and we should return false in other cases as well. Basically,
>      >I think we should be consistent in handling the corrupt file case.
>      >
> 
>     FWIW I do agree with this - we should return false here, to make it
>     return false like in the other data corruption cases. AFAICS that's the
>     only inconsistency here.
> 
> 
> +1, I think that's the place to fix, rather than reversing all the other places.

+1 as I suggested upthread!

Regards,

-- 
Fujii Masao
Advanced Computing Technology Center
Research and Development Headquarters
NTT DATA CORPORATION



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