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help / color / mirror / Atom feedFrom: Zhijie Hou (Fujitsu) <[email protected]>
To: Alexander Uvizhev <[email protected]>
Cc: [email protected] <[email protected]>
Subject: RE: Starting logical replication at arbitrary point that's available in WAL
Date: Fri, 27 Dec 2024 12:20:05 +0000
Message-ID: <OS0PR01MB5716587A22BEBE121E988AC6940E2@OS0PR01MB5716.jpnprd01.prod.outlook.com> (raw)
In-Reply-To: <[email protected]>
References: <[email protected]>
On Friday, December 27, 2024 7:39 PM Alexander Uvizhev <[email protected]> wrote:
Hi,
> I'm doing a logical replication using streaming replication protocol and
> I'm trying to start a stream from a certain arbitrary point that's
> available in WAL. However, both CREATE_REPLICATION_SLOT and
> pg_create_logical_replication_slot() create slot with nearly last LSN/XID.
>
> Is it possible to create a replication slot with arbitrary LSN/XID values?
I think it's not supported to specify arbitrary LSN/XID values for a newly
created slot in core. However, if you have an existing slot with an older LSN/XID, you
can copy it using pg_copy_logical_replication_slot, and then advance the copied
slot to your desired position with pg_replication_slot_advance.
>
> Also pg_create_logical_replication_slot() for some reason gives
> different result than CREATE_REPLICATION_SLOT: new slot's `catalog_xmin`
> is set to the smallest `catalog_xmin` among already existing slots.
> Looks like a bug.
Could you provide a script to reproduce this issue ?
That would be helpful in diagnosing the reason.
Best Regards,
Hou zj
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To: [email protected]
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Subject: RE: Starting logical replication at arbitrary point that's available in WAL
In-Reply-To: <OS0PR01MB5716587A22BEBE121E988AC6940E2@OS0PR01MB5716.jpnprd01.prod.outlook.com>
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