Horton

Re: Replication slot stats misgivings

Masahiko Sawada <sawada.mshk@gmail.com>

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From: Masahiko Sawada <sawada.mshk@gmail.com>
To: Amit Kapila <amit.kapila16@gmail.com>
Cc: vignesh C <vignesh21@gmail.com>, Andres Freund <andres@anarazel.de>, pgsql-hackers <pgsql-hackers@postgresql.org>, Kyotaro HORIGUCHI <horiguchi.kyotaro@lab.ntt.co.jp>
Date: 2021-04-28T04:07:11Z
Lists: pgsql-hackers 
On Wed, Apr 28, 2021 at 12:29 PM Amit Kapila <amit.kapila16@gmail.com> wrote:
>
> On Tue, Apr 27, 2021 at 11:02 AM vignesh C <vignesh21@gmail.com> wrote:
> >
> > On Tue, Apr 27, 2021 at 9:48 AM vignesh C <vignesh21@gmail.com> wrote:
> > >
> >
> > Attached patch has the changes to update statistics during
> > spill/stream which prevents the statistics from being lost during
> > interrupt.
> >
>
>  void
> -UpdateDecodingStats(LogicalDecodingContext *ctx)
> +UpdateDecodingStats(ReorderBuffer *rb)
>
> I don't think you need to change this interface because
> reorderbuffer->private_data points to LogicalDecodingContext. See
> StartupDecodingContext.

+1

With this approach, we could still miss the totalTxns and totalBytes
updates if the decoding a large but less than
logical_decoding_work_mem is interrupted, right?

Regards,

-- 
Masahiko Sawada
EDB:  https://www.enterprisedb.com/

Commits

  1. Doc: Update logical decoding stats information.

  2. Fix tests for replication slots stats.

  3. Update replication statistics after every stream/spill.

  4. Fix the computation of slot stats for 'total_bytes'.

  5. Another try to fix the test case added by commit f5fc2f5b23.

  6. Use HTAB for replication slot statistics.

  7. Fix test case added by commit f5fc2f5b23.

  8. Add information of total data processed to replication slot stats.

  9. Use NameData datatype for slotname in stats.