From: | Alvaro Herrera <alvherre(at)2ndquadrant(dot)com> |
---|---|
To: | Mithun Cy <mithun(dot)cy(at)gmail(dot)com> |
Cc: | PostgreSQL Hackers <pgsql-hackers(at)lists(dot)postgresql(dot)org>, PostgreSQL mailing lists <pgsql-bugs(at)lists(dot)postgresql(dot)org> |
Subject: | Re: DROP OWNED CASCADE vs Temp tables |
Date: | 2020-01-13 22:45:06 |
Message-ID: | 20200113224506.GA5833@alvherre.pgsql |
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Lists: | pgsql-bugs pgsql-hackers |
On 2020-Jan-07, Mithun Cy wrote:
> I have a test where a user creates a temp table and then disconnect,
> concurrently we try to do DROP OWNED BY CASCADE on the same user. Seems
> this causes race condition between temptable deletion during disconnection
> (@RemoveTempRelations(myTempNamespace)) and DROP OWNED BY CASCADE operation
> which will try to remove same temp table when they find them as part of
> pg_shdepend.
Cute.
This seems fiddly to handle better; maybe you'd have to have a new
PERFORM_DELETION_* flag that says to ignore "missing" objects; so when
you go from shdepDropOwned, you pass that flag all the way down to
doDeletion(), so the objtype-specific function is called with
"missing_ok", and ignore if the object has already gone away. That's
tedious because none of the Remove* functions have the concept of
missing_ok.
--
Álvaro Herrera https://www.2ndQuadrant.com/
PostgreSQL Development, 24x7 Support, Remote DBA, Training & Services
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