Re: Temporary tables prevent autovacuum, leading to XID wraparound - Mailing list pgsql-hackers

From Alvaro Herrera
Subject Re: Temporary tables prevent autovacuum, leading to XID wraparound
Date
Msg-id 20180808144002.usbjhg3qzwfxx3w7@alvherre.pgsql
Whole thread Raw
In response to Re: Temporary tables prevent autovacuum, leading to XID wraparound  (Michael Paquier <michael@paquier.xyz>)
Responses Re: Temporary tables prevent autovacuum, leading to XID wraparound
List pgsql-hackers
On 2018-Aug-08, Michael Paquier wrote:

> As this introduces a new
> field to PGPROC, so back-patching the thing as-is would cause an ABI
> breakage.  Are folks here fine with the new field added to the bottom of
> the structure for the backpatched versions, including v11?  I have found
> about commit 13752743 which has also added a new field called
> isBackgroundWorker in the middle of PGPROC in a released branch, which
> looks to me like an ABI breakage...

Unnoticed ABI breaks make my hair stand on end. 

I suppose if we didn't know about 13752743 earlier, then not much
outside code relies on PGPROC, or at least its members after
isBackgroundWorker.  I wouldn't move it now (I suppose anyone who cared
has already adjusted for it), but please do put your new member at the
end in backbranches.

I'm unsure about pg11 -- is it a backbranch already or not?  Since we've
released beta3 already, ISTM we should consider it so.

-- 
Álvaro Herrera                https://www.2ndQuadrant.com/
PostgreSQL Development, 24x7 Support, Remote DBA, Training & Services


pgsql-hackers by date:

Previous
From: Isaac Morland
Date:
Subject: Re: Facility for detecting insecure object naming
Next
From: Tom Lane
Date:
Subject: Re: Facility for detecting insecure object naming