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help / color / mirror / Atom feedFrom: Michail Nikolaev <[email protected]>
To: Amit Kapila <[email protected]>
Cc: Hayato Kuroda (Fujitsu) <[email protected]>
Cc: PostgreSQL Hackers <[email protected]>
Cc: Andres Freund <[email protected]>
Subject: Re: [BUG?] check_exclusion_or_unique_constraint false negative
Date: Mon, 5 Aug 2024 13:11:50 +0200
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Hello!
> Right, but we are extending this functionality to detect and resolve
> such conflicts [1][2]. I am hoping after that such updates won't be
> missed.
Yes, this is a nice feature. However, without the DirtySnapshot index scan
fix, it will fail in numerous instances, especially in master-master
replication.
The update_missing feature is helpful in this case, but it is still not the
correct event because a real tuple exists, and we should receive
update_differ instead. As a result, some conflict resolution systems may
malfunction. For example, if the resolution method is set to apply_or_skip,
it will insert the new row, causing two rows to exist. This system is quite
fragile, and I am sure there are many more complicated scenarios that could
arise.
Best regards,
Mikhail.
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Subject: Re: [BUG?] check_exclusion_or_unique_constraint false negative
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