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Re: [HACKERS] logical replication syntax (was DROP SUBSCRIPTION,query cancellations and slot handling) - Mailing list pgsql-hackers

From Alvaro Herrera
Subject Re: [HACKERS] logical replication syntax (was DROP SUBSCRIPTION,query cancellations and slot handling)
Date
Msg-id 20170502154959.r45gitdimklbcrwt@alvherre.pgsql
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In response to Re: [HACKERS] logical replication syntax (was DROP SUBSCRIPTION,query cancellations and slot handling)  (Petr Jelinek <petr.jelinek@2ndquadrant.com>)
Responses Re: [HACKERS] logical replication syntax (was DROP SUBSCRIPTION,query cancellations and slot handling)  (Robert Haas <robertmhaas@gmail.com>)
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Petr Jelinek wrote:

> So the only way to fulfill the requirement you stated is to just not try
> to drop the slot, ever, on DROP SUBSCRIPTION. That makes the default
> behavior leave resources on upstream that will eventually cause that
> server to stop unless user notices before. I think we better invent
> something that limits how much inactive slots can hold back WAL and
> catalog_xmin in this release as well then.

I don't understand why isn't the default behavior to unconditionally
drop the slot.  Why do we ever want the slot to be kept?

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

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