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From: Kyotaro Horiguchi <[email protected]>
To: [email protected]
Cc: [email protected]
Cc: [email protected]
Cc: [email protected]
Cc: [email protected]
Subject: Re: Add checkpoint and redo LSN to LogCheckpointEnd log message
Date: Thu, 20 Jan 2022 12:00:29 +0900 (JST)
Message-ID: <[email protected]> (raw)
In-Reply-To: <[email protected]>
References: <CALj2ACUGutu6As-9p76Ta2bV59J97fbiCc9NSzaWXqxPJdMvag@mail.gmail.com>
	<CALj2ACVM4wjS+wiNZf4ssdNMhSR-XUhR99fYbV=pC9_-=5wCtw@mail.gmail.com>
	<[email protected]>

At Thu, 20 Jan 2022 00:36:32 +0000, "Bossart, Nathan" <[email protected]> wrote in 
> On 1/3/22, 5:52 PM, "Kyotaro Horiguchi" <[email protected]> wrote:
> > It seems to me "LSN" or just "location" is more confusing or
> > mysterious than "REDO LSN" for the average user. If we want to avoid
> > being technically too detailed, we would use just "start LSN=%X/%X,
> > end LSN=%X/%X".  And it is equivalent to "WAL range=[%X/%X, %X/%X]"..
> 
> My first instinct was that this should stay aligned with
> pg_controldata, but that would mean using "location=%X/%X, REDO
> location=%X/%X," which doesn't seem terribly descriptive.  IIUC the
> "checkpoint location" is the LSN of the WAL record for the checkpoint,
> and the "checkpoint's REDO location" is the LSN where checkpoint
> creation began (i.e., what you must retain for crash recovery).  My
> vote is for "start=%X/%X, end=%X/%X."

+1. Works for me.  %X/%X itself expresses it is an LSN.

regards.

-- 
Kyotaro Horiguchi
NTT Open Source Software Center

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