From: "Hayato Kuroda (Fujitsu)" <kuroda.hayato@fujitsu.com>
To: "Takamichi Osumi (Fujitsu)" <osumi.takamichi@fujitsu.com>
CC: Kyotaro Horiguchi <horikyota.ntt@gmail.com>, "shveta.malik@gmail.com"
	<shveta.malik@gmail.com>, "dilipbalaut@gmail.com" <dilipbalaut@gmail.com>,
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	<pgsql-hackers@postgresql.org>, "smithpb2250@gmail.com"
	<smithpb2250@gmail.com>
Subject: RE: Time delayed LR (WAS Re: logical replication restrictions)
Thread-Topic: Time delayed LR (WAS Re: logical replication restrictions)
Thread-Index:
 AQHY9/ShM3rNQynKLEGxlQrbVTboVq49/p8AgAAVdUCAACUzgIAAGmvggAE9Q4CAGrgLgIAGn4SAgAEa+oCACASH0IAAVcQAgADhA4CAAJ9SgIAA6ooAgACXxjCAAP2tgIAAI3wAgAskQoCAAjW1AIAEQJCAgAGSZvCACuPkAIALeKSAgAFLMoCAABpJoIABBH4AgADTKICAAop2gIAFAzCAgAAc7rA=
Date: Tue, 17 Jan 2023 12:45:14 +0000
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Precedence: bulk

Dear hackers,

> At present, in the latter case,
> the apply worker exits without applying the suspended transaction
> after ALTER SUBSCRIPTION DISABLE command for the subscription.
> Meanwhile, there is no "disabling" command for physical replication,
> but I checked the behavior about what happens for promoting a secondary
> during the delay of recovery_min_apply_delay for physical replication as =
one
> example.
> The transaction has become visible even in the promoting in the middle of=
 delay.
>=20
> I'm not sure if I should make the time-delayed LR aligned with this behav=
ior.
> Does someone has an opinion for this ?

I put my opinion here. The current specification is correct; we should not =
follow
a physical replication manner.
One motivation for this feature is to offer opportunities to correct data l=
oss
errors. When accidental delete events occur, DBA can stop propagations on s=
ubscribers
by disabling the subscription, with the patch at present.
IIUC, when the subscription is disabled before transactions are started,
workers exit and stop applications. This feature delays starting txns, so w=
e
should regard such an alternation as that is executed before the transactio=
n.

Best Regards,
Hayato Kuroda
FUJITSU LIMITED