From: "Hayato Kuroda (Fujitsu)" <kuroda.hayato@fujitsu.com>
To: "'pgsql-hackers@lists.postgresql.org'"
	<pgsql-hackers@lists.postgresql.org>
CC: Amit Kapila <amit.kapila16@gmail.com>, "shveta.malik@gmail.com"
	<shveta.malik@gmail.com>
Subject: [bug fix] prepared transaction might be lost when
 max_prepared_transactions is zero on the subscriber
Thread-Topic: [bug fix] prepared transaction might be lost when
 max_prepared_transactions is zero on the subscriber
Thread-Index: AdrpUMp7BEoQ2P+xR7iU3zY3bjFG1w==
Date: Thu, 8 Aug 2024 05:07:18 +0000
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--_003_TYAPR01MB5692FAC23BE40C69DA8ED4AFF5B92TYAPR01MB5692jpnp_
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Dear hackers,

This thread forks from [1]. Here can be used to discuss second item.
Below part contains the same statements written in [1], but I did copy-and-=
paste
just in case. Attached patch is almost the same but bit modified based on t=
he comment
from Amit [2] - an unrelated change is removed.

Found issue
=3D=3D=3D=3D=3D
When the subscriber enables two-phase commit but doesn't set max_prepared_t=
ransaction >0
and a transaction is prepared on the publisher, the apply worker reports an=
 ERROR
on the subscriber. After that, the prepared transaction is not replayed, wh=
ich
means it's lost forever. Attached script can emulate the situation.

--
ERROR:  prepared transactions are disabled
HINT:  Set "max_prepared_transactions" to a nonzero value.
--

The reason is that we advanced the origin progress when aborting the
transaction as well (RecordTransactionAbort->replorigin_session_advance). S=
o,
after setting replorigin_session_origin_lsn, if any ERROR happens when prep=
aring
the transaction, the transaction aborts which incorrectly advances the orig=
in lsn.

An easiest fix is to reset session replication origin before calling the
RecordTransactionAbort(). I think this can happen when 1) LogicalRepApplyLo=
op()
raises an ERROR or 2) apply worker exits. Attached patch can fix the issue =
on HEAD.

[1]: https://www.postgresql.org/message-id/TYAPR01MB5692FA4926754B91E9D7B5F=
0F5AA2%40TYAPR01MB5692.jpnprd01.prod.outlook.com
[2]: https://www.postgresql.org/message-id/CAA4eK1L-r8OKGdBwC6AeXSibrjr9xKs=
g8LjGpX_PDR5Go-A9TA%40mail.gmail.com

Best regards,
Hayato Kuroda
FUJITSU LIMITED


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