Re: Resetting spilled txn statistics in pg_stat_replication

From: Amit Kapila <amit(dot)kapila16(at)gmail(dot)com>
To: Justin Pryzby <pryzby(at)telsasoft(dot)com>
Cc: Masahiko Sawada <masahiko(dot)sawada(at)2ndquadrant(dot)com>, Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us>, Dilip Kumar <dilipbalaut(at)gmail(dot)com>, Magnus Hagander <magnus(at)hagander(dot)net>, Tomas Vondra <tomas(dot)vondra(at)2ndquadrant(dot)com>, PostgreSQL Hackers <pgsql-hackers(at)lists(dot)postgresql(dot)org>
Subject: Re: Resetting spilled txn statistics in pg_stat_replication
Date: 2020-10-27 03:47:43
Message-ID: CAA4eK1+_hmDGpjyM50knFeOZr1ZOvJJSiFRKfNbGDRds9MyHmA@mail.gmail.com
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On Tue, Oct 27, 2020 at 8:51 AM Justin Pryzby <pryzby(at)telsasoft(dot)com> wrote:
>
> On Fri, Oct 23, 2020 at 10:45:34AM +0530, Amit Kapila wrote:
> > On Fri, Oct 23, 2020 at 8:59 AM Amit Kapila <amit(dot)kapila16(at)gmail(dot)com> wrote:
> >
> > While updating the streaming stats patch, it occurred to me that we
> > can write a better description spill_bytes as well. Attached contains
> > the update to spill_bytes description.
>
> + This and other spill
> + counters can be used to gauge the I/O occurred during logical decoding
> + and accordingly can tune <literal>logical_decoding_work_mem</literal>.
>
> "gauge the IO occurred" is wrong.
> Either: I/O *which* occured, or I/O occurring, or occurs.
>
> "can tune" should say "allow tuning".
>
> Like:
> + This and other spill
> + counters can be used to gauge the I/O which occurs during logical decoding
> + and accordingly allow tuning of <literal>logical_decoding_work_mem</literal>.
>
> - Number of times transactions were spilled to disk. Transactions
> + Number of times transactions were spilled to disk while performing
> + decoding of changes from WAL for this slot. Transactions
>
> What about: "..while decoding changes.." (remove "performing" and "of").
>

All of your suggestions sound good to me. Find the patch attached to
update the docs accordingly.

--
With Regards,
Amit Kapila.

Attachment Content-Type Size
0001-Minor-improvements-in-description-of-spilled-counter.patch application/octet-stream 1.9 KB

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