From: | Kyotaro Horiguchi <horikyota(dot)ntt(at)gmail(dot)com> |
---|---|
To: | michael(at)paquier(dot)xyz |
Cc: | pgsql-hackers(at)lists(dot)postgresql(dot)org |
Subject: | Re: Improve error context after some failed XLogReadRecord() |
Date: | 2021-11-09 07:58:11 |
Message-ID: | 20211109.165811.1898362328075508524.horikyota.ntt@gmail.com |
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Lists: | pgsql-hackers |
At Tue, 9 Nov 2021 10:47:11 +0900, Michael Paquier <michael(at)paquier(dot)xyz> wrote in
> Hi all,
>
> I have noticed $subject while looking at a patch in this area:
> https://www.postgresql.org/message-id/YYiqxtEqhgb5gIWL@paquier.xyz
>
> While we don't expect the four callers of XLogReadRecord() related to
> logical decoding to fail in the code paths changed by the patch
> attached, I think that it would be good to provide more context to
> users rather than just emitting an elog(ERROR) coming directly from
> the WAL reader. This way, it becomes a bit easier to guess from where
> the failure is coming.
>
> A patch is attached to improve all those elog()s. I have tried not to
> be too fancy about those new error strings, but I am sure that these
> could be tweaked.
>
> Thoughts?
As the whole, I agree that any substantial message is far better than
"%s" in regard to identifying the line that emitted a log line.
+ elog(ERROR, "could not find record to advance replication slot: %s",
I prefer "could not read record while advancing replcation slot",
because it is not finding a record but it is reading successive
records. However, I don't strongly object to the current wording.
+ elog(ERROR, "could not find record to send logically-decoded data: %s", errm);
I prefer something like the above for the same reason. How about
"could not read record while sending logically-decoded data:". The
same with above, I'm not strongly opposed to the current wording.
Otherwise it looks good to me.
regards.
--
Kyotaro Horiguchi
NTT Open Source Software Center
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