From: | Dilip Kumar <dilipbalaut(at)gmail(dot)com> |
---|---|
To: | Amit Kapila <amit(dot)kapila16(at)gmail(dot)com> |
Cc: | Erik Rijkers <er(at)xs4all(dot)nl>, Kuntal Ghosh <kuntalghosh(dot)2007(at)gmail(dot)com>, Tomas Vondra <tomas(dot)vondra(at)2ndquadrant(dot)com>, Michael Paquier <michael(at)paquier(dot)xyz>, Peter Eisentraut <peter(dot)eisentraut(at)2ndquadrant(dot)com>, PostgreSQL Hackers <pgsql-hackers(at)postgresql(dot)org> |
Subject: | Re: PATCH: logical_work_mem and logical streaming of large in-progress transactions |
Date: | 2020-08-21 05:04:46 |
Message-ID: | CAFiTN-vKRvkJVB6S13sm_4Kwt93Nif60s+deB5YamgZ+304ROA@mail.gmail.com |
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On Fri, Aug 21, 2020 at 10:20 AM Amit Kapila <amit(dot)kapila16(at)gmail(dot)com> wrote:
>
> On Fri, Aug 21, 2020 at 9:14 AM Amit Kapila <amit(dot)kapila16(at)gmail(dot)com> wrote:
> >
> > On Thu, Aug 20, 2020 at 5:42 PM Dilip Kumar <dilipbalaut(at)gmail(dot)com> wrote:
> > >
> > > On Thu, Aug 20, 2020 at 2:30 PM Amit Kapila <amit(dot)kapila16(at)gmail(dot)com> wrote:
> > > >
> > > >
> > > > Right, I think this can happen if one has changed those by BufFileSeek
> > > > before doing truncate. We should fix that case as well.
> > >
> > > Right.
> > >
> > > > > I will work on those along with your other comments and
> > > > > submit the updated patch.
> > >
> > > I have fixed this in the attached patch along with your other
> > > comments. I have also attached a contrib module that is just used for
> > > testing the truncate API.
> > >
> >
> > Few comments:
> > ==============
> > +void
> > +BufFileTruncateShared(BufFile *file, int fileno, off_t offset)
> > {
> > ..
> > + if ((i != fileno || offset == 0) && i != 0)
> > + {
> > + SharedSegmentName(segment_name, file->name, i);
> > + FileClose(file->files[i]);
> > + if (!SharedFileSetDelete(file->fileset, segment_name, true))
> > + ereport(ERROR,
> > + (errcode_for_file_access(),
> > + errmsg("could not delete shared fileset \"%s\": %m",
> > + segment_name)));
> > + numFiles--;
> > + newOffset = MAX_PHYSICAL_FILESIZE;
> > +
> > + if (i == fileno)
> > + newFile--;
> > + }
> >
> > Here, shouldn't it be i <= fileno? Because we need to move back the
> > curFile up to newFile whenever curFile is greater than newFile
> >
>
> I think now I have understood why you have added this condition but
> probably a comment on the lines "This is required to indicate that we
> have removed the given fileno" would be better for future readers.
Okay.
--
Regards,
Dilip Kumar
EnterpriseDB: http://www.enterprisedb.com
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