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 <CALj2ACWt6kqriAHrO+AJj+OmP=suwbktHT5JoYAn-nqZe2gd2g@mail.gmail.com>
 <20211224.145134.1164706994861031206.horikyota.ntt@gmail.com>
 <YcW5D2GjWlIzbbKs@paquier.xyz>
 <CALj2ACXzv6FJNbTnP9uYsPXFeA4UcugSWDecxr19SjFCUCxP-g@mail.gmail.com>
In-Reply-To: 
 <CALj2ACXzv6FJNbTnP9uYsPXFeA4UcugSWDecxr19SjFCUCxP-g@mail.gmail.com>
From: Bharath Rupireddy <bharath.rupireddyforpostgres@gmail.com>
Date: Tue, 28 Dec 2021 08:26:28 +0530
Message-ID: 
 <CALj2ACUP84UYSimewLSs8--rT9dUTA7CUYTgXTnEb-2iHkc9wA@mail.gmail.com>
Subject: Re: Add checkpoint and redo LSN to LogCheckpointEnd log message
To: Michael Paquier <michael@paquier.xyz>
Cc: Kyotaro Horiguchi <horikyota.ntt@gmail.com>,
	PostgreSQL Hackers <pgsql-hackers@lists.postgresql.org>
Content-Type: multipart/mixed; boundary="0000000000005d13b805d42bf8ba"
Archived-At: 
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Content-Type: text/plain; charset="UTF-8"

On Fri, Dec 24, 2021 at 5:54 PM Bharath Rupireddy
<bharath.rupireddyforpostgres@gmail.com> wrote:
>
> On Fri, Dec 24, 2021 at 5:42 PM Michael Paquier <michael@paquier.xyz> wrote:
> >
> > On Fri, Dec 24, 2021 at 02:51:34PM +0900, Kyotaro Horiguchi wrote:
> > > I thougt about something like the following, but your proposal may be
> > > clearer.
> >
> > +    "LSN=%X/%X, REDO LSN=%X/%X",
> > This could be rather confusing for the average user, even if I agree
> > that this is some information that only an advanced user could
> > understand.  Could it be possible to define those fields in a more
> > deterministic way?  For one, it is hard to understand the relationship
> > between both fields without looking at the code, particulary if both
> > share the same value.  It is at least rather..  Well, mostly, easy to
> > guess what each other field means in this context, which is not the
> > case of what you are proposing here.  One idea could be use also
> > "start point" for REDO, for example.
>
> How about "location=%X/%X, REDO start location=%X/%X"? The entire log
> message can look like below:
>
> 2021-12-24 12:20:19.140 UTC [1977834] LOG:  checkpoint
> complete:location=%X/%X, REDO start location=%X/%X; wrote 7 buffers
> (0.0%); 0 WAL file(s) added, 0 removed, 0 recycled; write=0.005 s,
> sync=0.007 s, total=0.192 s; sync files=5, longest=0.005 s,
> average=0.002 s; distance=293 kB, estimate=56584 kB
>
> Another variant:
> 2021-12-24 12:20:19.140 UTC [1977834] LOG:  checkpoint completed at
> location=%X/%X with REDO start location=%X/%X: wrote 7 buffers (0.0%);
> 0 WAL file(s) added, 0 removed, 0 recycled; write=0.005 s, sync=0.007
> s, total=0.192 s; sync files=5, longest=0.005 s, average=0.002 s;
> distance=293 kB, estimate=56584 kB
> 2021-12-24 12:20:19.140 UTC [1977834] LOG:  restartpoint completed at
> location=%X/%X with REDO start location=%X/%X: wrote 7 buffers (0.0%);
> 0 WAL file(s) added, 0 removed, 0 recycled; write=0.005 s, sync=0.007
> s, total=0.192 s; sync files=5, longest=0.005 s, average=0.002 s;
> distance=293 kB, estimate=56584 kB

Here are the 2 patches.

one(v2-1-XXX.patch) adding the info as:
2021-12-28 02:44:34.870 UTC [2384386] LOG:  checkpoint complete:
location=0/1B03040, REDO start location=0/1B03008; wrote 466 buffers
(2.8%); 0 WAL file(s) added, 0 removed, 0 recycled; write=0.014 s,
sync=0.038 s, total=0.072 s; sync files=21, longest=0.022 s,
average=0.002 s; distance=6346 kB, estimate=6346 kB

another(v2-2-XXX.patch) adding the info as:
2021-12-28 02:52:24.464 UTC [2394396] LOG:  checkpoint completed at
location=0/212FFC8 with REDO start location=0/212FF90: wrote 451
buffers (2.8%); 0 WAL file(s) added, 0 removed, 1 recycled;
write=0.012 s, sync=0.032 s, total=0.071 s; sync files=6,
longest=0.022 s, average=0.006 s; distance=6272 kB, estimate=6272 kB

attaching v1-0001-XXX from the initial mail again just for the sake of
completion:
2021-12-23 14:58:54.714 UTC [1965649] LOG:  checkpoint complete: wrote
0 buffers (0.0%); 0 WAL file(s) added, 0 removed, 0 recycled;
write=0.001 s, sync=0.001 s, total=0.025 s; sync files=0,
longest=0.000 s, average=0.000 s; distance=0 kB, estimate=0 kB;
LSN=0/14D0AD0, REDO LSN=0/14D0AD0

Thoughts?

Regards,
Bharath Rupireddy.

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