From: "Hayato Kuroda (Fujitsu)" <kuroda.hayato@fujitsu.com>
To: PostgreSQL Hackers <pgsql-hackers@lists.postgresql.org>
CC: Julien Rouhaud <rjuju123@gmail.com>, Masahiko Sawada
	<sawada.mshk@gmail.com>, Amit Kapila <amit.kapila16@gmail.com>
Subject: Suppress generating WAL records during the upgrade
Thread-Topic: Suppress generating WAL records during the upgrade
Thread-Index: AdnJ5I+Gdc6/k91PRkOIGyS6qJEQAg==
Date: Tue, 8 Aug 2023 10:43:06 +0000
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--_002_TYAPR01MB58660273EACEFC5BF256B133F50DATYAPR01MB5866jpnp_
Content-Type: text/plain; charset="iso-2022-jp"
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Dear hackers,
(CC: Julien, Sawada-san, Amit)

This is a fork thread from "[PoC] pg_upgrade: allow to upgrade publisher no=
de" [1].

# Background

[1] is the patch which allows to replicate logical replication slots from o=
ld to new node.
Followings describe the rough steps:

1. Boot old node as binary-upgrade mode
2. Check confirmed_lsn of all the slots, and confirm all WALs are replicate=
d to downstream
3. Dump slot info to sql file
4. Stop old node
5. Boot new node as binary-upgrade mode
...

Here, step 2 was introduced for avoiding data loss. If there are some WAL r=
ecords
ahead confirmed_lsn, such records would not be replicated anymore - it may =
be dangerous.

So in the current patch, pg_upgrade fails if other records than SHUTDOWN_CH=
ECKPOINT
exits after any confirmed_flush_lsn.

# Problem

We found that following three records might be generated during the upgrade=
.

* RUNNING_XACT
* CHECKPOINT_ONLINE
* XLOG_FPI_FOR_HINT

RUNNING_XACT might be written by the background writer. Conditions for the =
generation are:

a. Elapsed 15 seconds since the last WAL creation or bootstraping of the pr=
ocess, and either of them:
b-1. The process had never create the RUNNING_XACT record, or
b-2. Some "important WALs" were created after the last RUNNING_XACT record


CHECKPOINT_ONLINE might be written by the checkpointer. Conditions for the =
generation are:

a. Elapsed checkpoint_timeout seconds since the last creation or bootstrapi=
ng, and either of them:
b-1. The process had never create the CHECKPOINT_ONLINE record, or
b-2. Some "important WALs" were created after the last CHECKPOINT record


XLOG_FPI_FOR_HINT, which is raised by Sawada-san, might be generated by bac=
kend processes.
Conditions for the generation are:

a. Backend processes scanned any tuples (even if it was the system catalog)=
, or either of them:
b-1. Data checksum was enabled, or
b-2. wal_log_hints was set to on

# Solution

I wanted to suppress generations of WALs during the upgrade, because of the=
 "# Background".

Regarding the RUNNING_XACT and CHECKPOINT_ONLINE, it might be OK by removin=
g the
condition b-1. The duration between bootstrap and initial {RUNNING_XACT|CHE=
CKPOINT_ONLINE}
becomes longer, but I could not find impacts by it.

As for the XLOG_FPI_FOR_HINT, the simplest way I came up with is not to cal=
l
XLogSaveBufferForHint() during binary upgrade. Considerations may be not en=
ough,
but I attached the patch for the fix. It passed CI on my repository.


Do you have any other considerations about it?
An approach, which adds "if (IsBinaryUpgare)" in XLogInsertAllowed(), was p=
roposed in [2].=20
But I'm not sure it could really solve the issue - e.g., XLogInsertRecord()=
 just
raised an ERROR if !XLogInsertAllowed().

[1]: https://commitfest.postgresql.org/44/4273/
[2]: https://www.postgresql.org/message-id/flat/20210121152357.s6eflhqyh4g5=
e6dv%40dalibo.com

Best Regards,
Hayato Kuroda
FUJITSU LIMITED


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