Isn't XLogRecord carries full information to be decoded in itself?If so a 
VACCUM should not be a problem in decoding?

Sanyam Jain

From: Michael Paquier <>
Sent: Monday, June 12, 2017 6:52:06 AM
To: sanyam jain
Cc: Pg Hackers
Subject: Re: [HACKERS] Why forcing Hot_standby_feedback to be enabled when 
creating a logical decoding slot on standby

On Mon, Jun 12, 2017 at 3:16 PM, sanyam jain <> wrote:
> I have created a logical decoding slot on a standby but i haven't enabled
> Hot_standby_feedback.What are the test cases where this setup will fail?

hot_standby_feedback needs to be enabled at all times in logical
decoding so as the node does not remove rows that are still needed for
the decoding, and a VACUUM passing by with a minimal xmin too high
would cause inconsistent decoded data.

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